Rhombodera latipronotum belongs to the genus Rhombodera, a group of praying mantises in the family Mantidae, subfamily Hierodulinae, and tribe Hierodulini. Members of this genus are commonly called Asian shield mantids because of a feature shared by all species: pronounced lateral expansions of the pronotum, the dorsal plate of the first thoracic segment, which make the insect look as though it is wearing a shield. In most species the upper surface of this shield is green, allowing the mantis to blend seamlessly into foliage and even conceal its folded forelimbs from view. The underside, by contrast, is brightly colored and is flashed during deimatic displays, the dramatic threat poses a mantis performs when camouflage has already failed and a predator has spotted it.

The genus currently includes around 30 species spread widely across mainland and insular Asia, from India and Nepal to Japan, Indonesia, Papua New Guinea, and the Solomon Islands. Yet the taxonomy and phylogeny of the tribe Hierodulini remain unsettled, and synonyms between the large genera Hierodula, Rhombodera, Titanodula, and Sphodromantis are frequently rediscussed and updated. For this reason, the number of recognized Rhombodera species is likely to change again, and some current members of the genus may eventually be transferred into new genera, as has happened in the past. This instability makes it difficult to identify specimens with confidence, particularly when the scientific literature on a given species is incomplete.

Rhombodera latipronotum was described by Zhang in 1990 as endemic to the forested areas of Yunnan province in southern China, one of the richest regions in the country for mantids and insects in general, and considered an intersection of three biodiversity hotspots: the Indo-Burma region, the mountains of Southwest China, and the eastern Himalayas. The specific epithet derives from the Latin adjective latus, meaning broad or wide, and the noun pronotum, referring to the dorsal plate of the first thoracic segment. Indeed, the defining characteristic of this mantis is the exceptional width of its pronotum, which exceeds that of many other Rhombodera species and sometimes surpasses 20 millimeters in adult females. Zhang based the original description on a single male specimen designated as the holotype, and subsequent attempts by mantis enthusiasts to collect more individuals at the type locality using light traps revealed a curious pattern: only males were attracted to the traps, while females proved far more elusive.

The new study overcame these limitations by combining direct examination of specimens held in entomological collections with observations contributed by citizen scientists across Southeast Asia. The researcher gathered photographs uploaded to platforms such as iNaturalist and the Global Biodiversity Information Facility, and also collected reports through insect identification groups on Facebook and through a network called Mondo delle Mantidi, Italian for World of Mantids, on Instagram. For each photograph, users were asked to provide the exact location where the specimen was found and relevant environmental information, such as whether the site was urban or suburban. These reports were compared against specimens in the author’s collection, and photographs taken with a Nikon Coolpix B500 and processed with Adobe Photoshop were used to produce an accurate description of adults of both sexes. Distribution maps were generated using QGIS 3.34 Prizen software.

The results confirm the presence of R. latipronotum in eleven new localities across three countries. In China, specimens were documented in the Guangxi autonomous region, specifically in the Fangchenggang area, including adult females, a female nymph, a male nymph, and an ootheca, the foam-like egg case mantises produce. In Laos, records came from Louangphrabang province, Huaphanne province, and Oudomxay province, spanning elevations from around 305 meters to between 1200 and 1900 meters on Phu Phane Mountain. In Vietnam, the species was documented in the Hà Nội municipality and in Cao Bang province in the country’s northeast. All of these new territories fall within the Indo-Malay ecozone, characterized by recurrent tropical biomes such as rainforests, seasonal forests, and grasslands, with a climate largely shaped by the alternation between trade winds and monsoon seasons.

The morphological redescription reveals a large mantis with a marked dilatation of the pronotum, which measures between 16 and over 20 millimeters wide. Adult males reach total lengths of 72.5 to 82.3 millimeters, with pronota 20.5 to 21.0 millimeters long and 17.5 to 17.7 millimeters wide, while the single described female is larger still at 89.3 millimeters total length, with a pronotum 23.1 millimeters long and 22.2 millimeters wide. The hind wings are hyaline and lack the reddish tinge typical of many other species in the genus, a feature that helps distinguish R. latipronotum from its relatives. Males are uniformly green with a triangular head, a nearly flat vertex, and three large ocelli arranged in a triangle on a well-developed ocellar tubercle. The forewings have a green costal area with a whitish, milky stigma partly surrounded by a dark brown halo, and the veins are jagged and irregular. Females are very large and robust, with aquamarine highlights and reddish spots on the lower abdomen, mesothorax, and metathorax, and pronotal expansions so large they entirely occlude the dorsal view of the forelegs.

Both sexes share a distinctive arrangement of spines on the forefemora, with 13 to 15 anteroventral spines unequal in length and coloration, following a pattern in which longer spines are completely black with a brown blotch at the base while smaller spines match the inner side of the femur except for black tips. The foretibiae carry 14 to 15 internal spines and 11 external spines, all black only at the tip. The basitarsus is as long as all remaining tarsomeres combined, and well-developed euplantulae with adherent ends help the insect cling to plants. Dark spots between the third and fifth sternites are used in deimatic displays. The male genitalia, examined following standard preparation techniques, show an apical process of the left phallomere that is long with a hook-like apex, a contorted anterior lobe of the phalloid apophysis, and a rod-like lateral secondary distal process that gradually narrows to a sharp point.

Behavioral observations gathered through the citizen science reports add an ecological dimension to the redescription. The species inhabits both lowland areas and higher elevations, but always in places with a high density of tree, shrub, and grass vegetation. Females remain flattened on leaves, waiting motionless for prey, and lay their oothecae on branches several meters above the ground. Males, by contrast, are easily attracted to artificial lights and, because of their greater flying ability, can move considerable distances. As in the type locality of southern Yunnan, the species is not abundant where it occurs, remaining fairly confined and thus common only locally. This pattern of localized scarcity, combined with the difficulty of collecting females, helps explain why the species remained so poorly documented for more than three decades after its description.

The expansion of the known range carries significant implications for biogeography and conservation. The presence of R. latipronotum in different regions may suggest ancient connections between now-disjointed habitats or processes of natural dispersion, and future studies should investigate the mechanisms behind this spread, including the biotic and abiotic factors that promote its stabilization in new territories. The possibility that the species’ expansion is partly due to accidental or deliberate introductions by humans cannot be ruled out, given the increasing movement of goods and people between these regions. As an efficient predator, the mantis could alter prey populations and compete with other predators in local insect communities, making it essential to study its ecological interactions. If the new populations in Laos, Vietnam, and Guangxi are found in threatened or fragmented habitats, they may require specific protection measures, and knowledge of the species’ extensive distribution can inform more targeted conservation strategies. The study also highlights the immense biodiversity within the surveyed regions and underscores the need for continued exploration to fully catalogue the mantids of Southeast Asia, a task in which citizen scientists are proving to be indispensable partners.

Subject of Research: New data on the distribution of Rhombodera latipronotum (Mantodea, Mantidae) in Southeast Asia, with species redescription and biogeographic considerations

Article Title: New data on the distribution of Rhombodera latipronotum ( Mantodea , Mantidae ) in Southeast Asia, with species redescription and biogeographic considerations

Article References: Fasano, A. (2025). New data on the distribution of Rhombodera latipronotum (Mantodea, Mantidae) in Southeast Asia, with species redescription and biogeographic considerations. Journal of Orthoptera Research, 34(1), 39-44. https://doi.org/10.3897/jor.34.130822

Image Credits: AI Generated

DOI: 10.3897/jor.34.130822

Keywords: data, distribution, Rhombodera, latipronotum, Mantodea, Mantidae, Southeast, Asia, species, redescription, biogeographic, considerations

The order Orthoptera comprises roughly 30,000 valid extant species, divided into the suborder Caelifera, which includes grasshoppers, and the suborder Ensifera, which includes crickets and katydids. In most studies of flower-visiting arthropods, orthopterans are excluded from analyses because they are rarely encountered or are not considered effective pollinators. Yet sporadic reports from around the world have documented these insects on flowers for decades, and some researchers have postulated that regular flower visitation may be an important precursor for orthopteran-plant mutualism through pollination services. The new study, building on a pivotal 2017 report that documented 41 orthopteran species visiting flowers of 35 plant species in Southeast Asia, argues that these insects are not rare flower visitors at all, but simply overlooked.

To reconstruct the bipartite network between orthopterans and the flowers they visit, the researchers drew on photographic records collected between late 2017 and mid-2024 across Singapore, the Philippines, Sabah in Borneo, Brunei Darussalam, Bach Ma National Park in Vietnam, and Johor State in Peninsular Malaysia. Both adults and nymphs were photographed as evidence of the visitor and the visited flowers, a technique particularly important when either the insects or the plants could not be collected. The interaction network was visualized using the plotweb function in the bipartite package in R, but with a crucial twist: rather than arranging taxa to minimize crossings, the researchers positioned the orthopterans according to their relative placements in the most recent orthopteran phylogenies, allowing the network to reveal which evolutionary lineages are most floriphilic.

The results are striking. Ensiferans, the katydids and crickets, account for 45 of the 58 flower-visiting taxa, or 78 percent of all orthopteran taxa observed on flowers, far outpacing the 13 caeliferan taxa, or 22 percent. Among the ensiferans, the subfamily Phaneropterinae stands out as the most prominent flower visitor, with 21 taxa representing 36 percent of all flower-visiting orthopteran taxa and 45 percent of all records, or 110 incidences. The genera Phaneroptera, Nisitrus, and Conocephalus were the top three genera observed visiting the most diverse genera of flowers, with Phaneroptera alone documented on flowers from 20 genera across 7 families. Among the caeliferans, only taxa from the subfamilies Pyrgomorphinae, Acridinae, Oxyinae, Catantopinae, and Cyrtacanthacridinae were observed on flowers, with the grasshopper genera Xenocatantops and Valanga recorded visiting the greatest number of flower genera.

Flowers of the family Asteraceae were the most visited, with 16 genera documented, followed by Fabaceae with 11 genera. Some genera, such as Sphagneticola, Ageratum, Prexalis, and Bidens, were visited by 10 to 15 orthopteran taxa each. Notable non-Asteraceae genera include Costus, visited by seven orthopteran taxa, Dillenia by six, Claoxylon by five, and Lantana by seven. The researchers also analyzed floral traits of the visited plants, finding that flowers occurring in clusters or inflorescences, head or capitulum forms, and solitary forms were the most frequently visited, accounting for 32.4, 15.5, and 14.1 percent of visited flower taxa respectively. White and yellow flowers dominated the color palette, at 25.4 and 21.1 percent, and radially symmetrical flowers were visited far more often than bilaterally symmetrical ones, at 73.2 versus 21.1 percent.

The phylogenetic arrangement of the network reveals patterns that would be invisible in a standard affiliation web. Phaneropterinae katydids, which are generalist flower visitors found across habitats ranging from open grasslands to different forest types, were documented visiting orchids, panicles of Cinnamomum, clusters of Caryota mitis, and the petals of Costus. Some species are more specialized, such as the mangrove-associated Holochlora signata, observed visiting the flowers of the mangrove tree Bruguiera cylindrica. The researchers note that Phaneropterinae can occur in high abundance and diversity in the forest canopy, where they are often only encountered at light traps, making their flower-visiting behavior particularly difficult to observe and document. Advances in non-invasive canopy sampling methods, such as macro-camera traps, may address this in the future, particularly during rare mass flowering events in dipterocarp forests.

Not every orthopteran lineage appears to be floriphilic. The absence of any record of flower-visiting Gryllacrididae in the dataset was unexpected, given that gryllacrids were the first orthopterans shown to pollinate flowers. Even during synchronous flowering events in the forest understory where gryllacrids tend to inhabit, no flower visitation was observed. Similarly, predominantly herbivorous katydids from the subfamilies Pseudophyllinae and Mecopodinae, close relatives of Phaneropterinae, do not appear to visit flowers. Small crickets from the families Trigonidiidae and Mogoplistidae, by contrast, are opportunistic feeders that dwell among the leaves and branches of herbs, shrubs, and understory trees where flowers are most accessible, and more records of these crickets visiting flowers were documented.

The researchers caution that floral traits alone do not explain why Asteraceae and Fabaceae dominate the visited flower list. Many of these taxa are free-flowering and tend to dominate their habitats, with genera such as Bidens, Prexalis, Neptunia, and Mimosa easily dominating ground vegetation and being highly invasive in some parts of the world, including Southeast Asia. Experimental work has demonstrated that more Phaneroptera individuals visit patches of vegetation with higher abundances of these flowers. Coincidentally, many of the flower genera are also attractive to butterflies, and some taxa have been deliberately planted to attract butterflies in managed parks and gardens, leading to increased encounters with flower-visiting orthopterans. The preference for radially symmetrical flowers may suggest that flower-visiting orthopterans are typically opportunistic and generalist florivores or pollinators, though Phaneroptera exhibit a specific preference for flowers over leaves, as shown by a series of experimental studies.

The color preference for white and yellow flowers is congruent with findings that generalist flower-visiting dipterans preferentially visit white and yellow flowers and colored traps, and behavioral experiments have shown that grasshoppers approach yellow targets more frequently than other colors. The ecological significance of this color preference among orthopterans remains unclear. Only slightly more plant taxa with terminal flowers were frequented compared to those with axillary flowers, and the researchers suggest that flower location may inform the visitor’s accessibility to resources and risk of exposure to predation, though these considerations are also dependent on other floral traits such as size, color patterns, wavelengths outside the human visible spectrum, and plant height.

Despite the insights offered, the researchers are careful not to overinterpret the data. They recommend caution against drawing too much inference at present owing to the unresolved phylogenetic relationships between the taxa involved and the incompleteness of the current dataset. Questions about whether these orthopterans help with pollination or cause more florivory damage to the plants remain open, and future studies combining cost-benefit analysis of both pollination and florivory by orthopterans are crucial to better understand their ecological roles. With many species from Southeast Asia still undescribed, with unknown natural history, and with a vast part of the region remaining unexplored and understudied, the researchers conclude that we are still extremely far from understanding the actual diversity of flower-visiting orthopterans. Continued natural history research, they argue, is essential for a more comprehensive understanding of these insects and their ecological impacts in the region.

Subject of Research: research news

Article Title: Improving and reconstructing data about the network between Orthoptera and flowers in Southeast Asia

Article References: Tan, M. K., Salvador, J. A. G., Nuñeza, O. M., Muhammad, A. A., Abdullah, N. A., Wahab, R. A., Baroga-Barbecho, J. B., Yap, S. A., Vu, T. T., Truong, T. C. T., Pham, T. H., Japir, R., & Chung, A. Y. C. (2025). Improving and reconstructing data about the network between Orthoptera and flowers in Southeast Asia. Journal of Orthoptera Research, 34(1), 135-142. https://doi.org/10.3897/jor.34.137349

Image Credits: AI Generated

DOI: 10.3897/jor.34.137349

Keywords: Improving, reconstructing, data, network, between, Orthoptera, flowers, Southeast, Asia, scientific research

The research team, led by Krystal Tolley and Graham Alexander, constructed a dated phylogeny based on one nuclear gene and two mitochondrial genes, with near-complete sampling of the genus. This was critical because no previous phylogeny had included all African species, leaving their monophyly untested. Earlier studies had suggested conflicting scenarios: some analyses placed the Ball Python, Python regius, at the base of the genus, hinting at a possible African origin, while others supported an Asian origin for the entire family. If the African species were not monophyletic, multiple independent dispersals into Africa would be required to explain current patterns. The new data settle the question decisively.

The phylogenetic analyses, run using both Bayesian and maximum likelihood frameworks and a multi-species coalescent approach in *BEAST, produced identical topologies. All four African species, P. anchietae, P. natalensis, P. regius and P. sebae, form a well-supported monophyletic clade to the exclusion of the Asian species. The genus Python itself diverged from other pythonid genera around 43 million years ago in Asia, and the African and Asian clades split approximately 33 million years ago during the Late Eocene to Early Oligocene transition. Ancestral range reconstruction using a Bayesian Binary MCMC method strongly supported the Oriental biogeographic region as the ancestral area, confirming a single dispersal event into Africa followed by diversification on the continent.

The timing of this dispersal is biogeographically telling. During the Eocene-Oligocene transition, the Afro-Arabian tectonic plates drew closer to Eurasia as the Tethys Sea receded, opening rare opportunities for faunal interchange. Fossil evidence shows that Python once occupied Europe, the Arabian Peninsula and the Iranian plateau, so the ancestral lineage likely arrived in Africa via those regions rather than directly from the Oriental region. Once in Africa, the lineage diversified, with P. regius diverging around 26 million years ago and P. anchietae about 22 million years ago. Species-level diversification ended around 12 million years ago, coinciding with the acceleration of mid-Miocene global cooling.

One of the study’s most striking findings concerns the taxonomic status of the Southern African Python, P. natalensis. Formerly classified as a subspecies of P. sebae, the two taxa are clearly distinct sister species that diverged approximately 12 million years ago. Haplotype networks built from mitochondrial Cyt-b and nuclear c-mos sequences showed no allele or haplotype sharing between the two species, even for individuals sampled from zones of sympatry in East Africa. Given that the slow-evolving c-mos gene showed complete divergence, the evidence strongly supports P. natalensis as a full species, vindicating Broadley’s 1999 elevation.

Body size emerges as a crucial factor shaping python distributions. Of the ten species in the genus, four are giants exceeding five metres in length, and all are restricted to tropical and sub-tropical regions. Fossil vertebrae from species that once occupied the current distribution gap easily exceed 10 millimetres in breadth, correlating with body sizes in excess of four metres. The researchers suggest that large body size may have influenced paleo- and present-day ranges through several mechanisms. Large-bodied snakes warm more slowly while basking, restricting activity in cool environments. Prey size selection and gape limitation drive the evolution of larger bodies where mega-faunal prey is available, and fecundity advantages in larger females may also select for increased size. All these factors tie large pythons to warm climates.

Temperature is a critical threshold for python reproduction. Female pythons actively incubate and protect their eggs, and successful incubation requires environmental temperatures above roughly 20 degrees Celsius. Today, temperatures across much of the distribution gap regularly fall below this threshold. The fossil record shows that pythons occupied the Arabian Peninsula and the Namib region during the early and mid-Miocene, before these areas progressed toward hyper-aridity in the Late Miocene. Hyper-aridity thus joins temperature as a second limiting factor, excluding pythons from the Arabian, Saharan and Namib deserts as well as from temperate Europe and the Iranian plateau.

The absence of pythons from Madagascar, both today and in the fossil record, receives an elegant explanation independent of climate. Most Malagasy reptile fauna colonised the island through overseas dispersal from eastern Africa during the Eocene and early Oligocene, roughly 55 to 35 million years ago, when paleo-currents were optimal. Python arrived in northern Africa after this window had closed, and shifting relative positions of Africa and Madagascar changed oceanic current directions away from the island, making overseas dispersal far less likely. The timing simply did not align.

Africa’s comparatively low python richness, four species from one genus, contrasts sharply with the dramatic adaptive radiation in Australasia, where 27 species from nine genera colonised environmentally diverse regions with novel niches. The researchers attribute Africa’s low speciation rates to its arid climate, reduced topographic and habitat complexity, and long-term geographic isolation through the early Cenozoic. These same features limited niche diversity and reduced opportunities for allopatric speciation, constraining Python to a modest continental radiation.

The study’s conclusions rest on a dataset of few loci, and the authors acknowledge that more detailed genomic datasets could strengthen confidence in their hypotheses. Nevertheless, their topology agrees with recent phylogenomic analyses, so they do not expect their interpretation to change substantially. The broader message is clear: long-term global cooling since the mid-Miocene has presumably driven range contractions, created the distribution gap, and possibly caused extinctions of Python species and populations. What was once a genus spanning Eurasia and Africa is now confined to warm, mesic tropical and sub-tropical refugia at the edges of two continents, a living testament to the power of climate to reshape life’s geography over deep time.

Subject of Research: Biogeography

Article Title: Into Africa: The biogeography of the genus Python in Africa

Article References: Tolley, K. A., & Alexander, G. J. (2025). Into Africa: The biogeography of the genus Python in Africa. Frontiers of Biogeography, 18, Article e146955. https://doi.org/10.21425/fob.18.146955

Image Credits: AI Generated

DOI: 10.21425/fob.18.146955

Keywords: pythons, biogeography, phylogenetics, Africa, Asia, climate change, fossils, snakes, genus, Python, scientific research

Discostella asterocostata was originally described from China in 1985 under the name Cyclotella asterocostata, based on scanning electron microscopic examination of samples collected in the 1970s. The species was later transferred to the genus Discostella in 2004, after researchers recognised that the position of its marginal fultoportulae, the strutted processes sitting between the valve costae, distinguished it from related centric diatoms. Over the following decades, the species turned up in Japan, South Korea and the Russian Far East. Then, in a publication in 2021, it was reported from North America, where re-examination of archived plankton samples revealed it had already been present in Beaver Lake, Arkansas and the Wabash River, Indiana since 2012. Sediment core analyses from several American lakes pushed its known presence on that continent back to at least the mid-1980s.

Europe, by contrast, remained a conspicuous gap. Freshwater centric diatoms have been intensively documented on the continent for decades through national floras, monitoring programmes and decades of electron microscopic surveys of the Danube phytoplankton. The species’ very distinctive morphology, a ring-shaped pattern in the central area of the valve, makes it difficult to miss under the microscope. The researchers therefore argue that its detection in the Mura River in 2016 roughly coincides with its first appearance in Europe, rather than representing an earlier overlooked record.

The new study draws on routine biomonitoring samples collected between 2016 and 2022 at eight sites along the Mura, Drava and Danube Rivers in Croatia, and monthly phytoplankton samples from thirteen sites along the Hungarian Danube and two of its side arms between May 2021 and April 2022. In the Croatian samples, the species was identified through light and scanning electron microscopy, appearing in plankton from April to September at all eight sites. Its contribution to total phytoplankton biomass was always modest, ranging from 0.2 to 3.2 percent within the class Mediophyceae, but its consistent presence across years and sites suggested it had already become a permanent member of the community.

The Hungarian story is more revealing. In the first scanning electron microscopic survey of 2021 samples, only a single valve of Discostella asterocostata was found, in a sample from the Ráckevei-Soroksári Danube side arm in July. The species was absent from the Diat.barcode database version used in the initial metabarcoding analysis, so the researchers could not identify it molecularly at first. When updated barcode sequences from China became available, the team re-analysed their previously unclassified Discostella sequences and found a near-perfect match, with uncorrected p-distances below 0.01 and at most one or two base pair differences across the 263-base-pair rbcL region used for metabarcoding.

The re-analysis transformed the picture. Molecular detection revealed the species throughout the entire Hungarian section of the Danube by 2021 to 2022, with higher relative read numbers during the warm water period and greatest abundance in the Ráckevei-Soroksári Danube. Even more strikingly, re-analysis of unclassified sequences from earlier phytobenthos surveys of 328 Hungarian surface water samples collected in 2019 and 2020 identified the species in five oxbow lakes along the southern Hungarian Danube, with the earliest molecular detections in September 2019. Two unassigned amplicon sequence variants from the 4th Joint Danube Survey, also collected in 2019, proved identical to the researchers’ sequences, providing independent confirmation that the species was already present in the region six years before its first microscopic record in Hungarian plankton.

Morphometric comparison added another layer to the evidence. The researchers measured eight valve features, including five diameter measurements, the count of marginal strutted processes and the number of outer and central striae, on 35 Croatian and 10 Hungarian valves, then compared the results with published morphometric data from Chinese and American populations. Principal component analysis showed that the first principal component, accounting for 91.8 percent of the variance in the dataset, was strongly correlated with cell diameter. More importantly, the populations from Croatia, Hungary, the United States and Asia completely overlapped on the second and third principal component axes, indicating that the four populations are morphologically indistinguishable. Phylogenetic analysis of the rbcL sequences placed all Discostella asterocostata variants in a monophyletic group well separated from other Discostella species, reinforcing the conclusion that the European populations have not diverged from their Asian ancestors.

The ecological preferences of the species offer a clue to its future in Europe. Spearman correlation analysis of Croatian samples showed a significant positive correlation between the species’ biomass and water temperature, and significant negative correlations with total organic carbon, nitrogen forms and chloride. The Hungarian molecular data confirmed these patterns, with relative read numbers positively correlated with temperature and negatively correlated with total organic carbon, total nitrogen and nitrate. The species also showed a negative correlation with discharge, suggesting a preference for slow-flowing or stagnant waters. In short, Discostella asterocostata favours warmer waters with lower nutrient loads, a profile that differs from the dominant centric diatoms of very large European rivers and that aligns uncomfortably well with the trajectory of climate warming.

How the species reached Europe remains uncertain, but the researchers consider several plausible vectors. In North America, invasive Asian carp, particularly silver carp and bighead carp, have been suggested as carriers, since their filtering apparatus can collect algae larger than 10 micrometres from the water and some algae may survive digestion and be excreted alive in faeces. Asian carps were introduced to Hungary from East Asia as early as 1963, but the researchers consider it unlikely that they explain the species’ appearance there, given the timing. The pattern of spread, with the species appearing in floodplain and protected oxbow lakes and in the Ráckevei-Soroksári Danube before it was detected in the main channel of the Hungarian Danube, suggests that waterbirds may have played a role as dispersal vectors, carrying viable cells between waterbodies. Ship ballast water and fish transport water remain additional possibilities that cannot be excluded.

For now, the species has not shown invasive behaviour in European rivers. It has never been the dominant centric diatom in any phytoplankton sample, and its rapid spread, though indisputable, has not been accompanied by the high abundances that would trigger ecological alarm. But its clear temperature-related seasonal dynamics, its preference for warm, nutrient-poor and slow-flowing waters, and its expansion pattern across the Danube catchment all support the hypothesis that ongoing warming of freshwater systems could promote its further dispersal and increased abundance. The study’s authors emphasise that integrating traditional microscopy with high-throughput molecular techniques such as metabarcoding is essential for the early detection of non-indigenous diatom species, particularly when they occur at low densities that routine counts of 400 to 500 valves can easily miss. As rising water temperatures and enhanced dispersal pathways continue to reshape aquatic ecosystems worldwide, the quiet colonisation of the Danube by a tiny Asian diatom may prove an early warning of changes still to come.

Subject of Research: First European record of the non-indigenous diatom Discostella asterocostata in the Danube River

Article Title: From Asia through America to Europe: Molecular and morphological evidence for a non-indigenous diatom species, Discostella asterocostata (B.Q.Lin, S.Q.Xie & S.X.Cai) Houk & Klee in Hungary and Croatia

Article References: Stanković, I., Shemesh, S., Hanžek, N., Šušnjara, M., Gligora Udovič, M., Kiss, K. T., Trábert, Z., Udvari, Z., Bíró, T., Vadkerti, E., & Ács, É. (2025). From Asia through America to Europe: Molecular and morphological evidence for a non-indigenous diatom species, Discostella asterocostata (B.Q.Lin, S.Q.Xie & S.X.Cai) Houk & Klee in Hungary and Croatia. Metabarcoding and Metagenomics, 9, Article e154667. https://doi.org/10.3897/mbmg.9.154667

Image Credits: AI Generated

DOI: 10.3897/mbmg.9.154667

Keywords: diatoms, invasive species, Danube River, metabarcoding, climate change, freshwater ecology, phytoplankton, non-indigenous species, Asia, America, Europe, Molecular

The study, published on 19 August 2026, applies geoeconomic statecraft as its primary theoretical lens, treating infrastructure as an instrument of power politics pursued by economic means. Rather than asking whether the Belt and Road Initiative is good or bad for South Asia, the authors ask a more technical question: which configurations of financing concentration, contractual risk allocation, operating rights, regulatory capacity, recipient-state bargaining and access to alternative partners make economic involvement convertible into political influence? The answer, they find, is that convertibility is rare, conditional and heavily dependent on the domestic institutions of the recipient state.

The clearest case of potential Chinese leverage is Pakistan. The China–Pakistan Economic Corridor, the flagship corridor running from Kashgar to Gwadar, concentrates financing from a single partner, embeds long-term contractual commitments and operates within a Pakistani political system in which the military plays a central role in economic governance. The corridor’s long-term plan through 2030, approved by Pakistan’s Planning Commission, formalises agricultural, industrial and port commitments that extend decades into the future. Yet even here, the study stops short of claiming automatic political control. Citing scholarship on how Pakistan and China negotiate, the authors note that Islamabad retains bargaining agency, and that the corridor’s benefits and risks are contested within Pakistan’s own federal politics, with provincial governments negotiating over route alignments and revenue shares.

Sri Lanka’s Hambantota Port is the second case the study identifies as comparatively favourable for potential leverage, but through a distinct mechanism: long-term commercial operating rights. In 2017, a Chinese state-owned enterprise acquired a 99-year lease on the port in exchange for debt relief, a transaction that CSIS analysis famously characterised as China buying Hambantota. The operating rights give China a commercial foothold in the Indian Ocean that could, in principle, support strategic access. But the study is emphatic that this does not establish military access or political control. Sri Lanka’s government retains regulatory authority over the port’s operations, and the transaction itself has become a cautionary tale about fiscal vulnerability rather than a template for debt-trap diplomacy. The authors align with Deborah Brautigam’s critical analysis of the debt-trap meme and with Chatham House research showing recipient influence on Belt and Road outcomes.

Elsewhere in the region, leverage is far more constrained. Bangladesh, Nepal and the Maldives present configurations in which implementation is uneven, financing is diversified and governments actively negotiate among competing partners. Bangladesh’s infrastructure portfolio mixes Chinese loans for the Karnaphuli tunnel and the Teesta river project with Japanese financing for the Matarbari power plant, World Bank support for regional connectivity and Asian Development Bank and Asian Infrastructure Investment Bank projects for railways and transmission infrastructure. Dhaka’s bargaining position is strengthened by this diversification, and the study documents how Bangladesh has urged China to lower interest rates on loans and reduce the trade gap, while simultaneously signing an $850 million deal with the World Bank in 2025. Bangladesh’s foreign policy, as the study notes through a neoclassical realist lens, is shaped by dilemmas of managing relations with both India and China rather than aligning with either.

Nepal’s case illustrates how a landlocked state uses infrastructure diplomacy to gain sea access without surrendering sovereignty. The 2019 transit transport protocol with China opened a new route to the sea, but Nepal’s implementation of Belt and Road projects remains slow, and the country has simultaneously engaged with the Millennium Challenge Corporation, an American grant programme, demonstrating the domestic agency that conditions whether Chinese involvement produces developmental benefits or strategic access. The study cites research on Nepal’s infrastructural rivalries showing how Kathmandu navigates between the BRI and the MCC, retaining regulatory authority and negotiating among partners rather than accepting a single corridor’s terms.

The Maldives presents a third configuration of constrained leverage. Chinese financing built the China–Maldives Friendship Bridge, a landmark project connecting Malé with the airport island, and Chinese loans constitute a significant share of the country’s public debt, as documented by the Auditor General’s Office and the Ministry of Finance. But the study notes that Maldivian governments have alternated between pro-China and pro-India orientations, and that the country’s debt sustainability depends on fiscal management rather than on any single creditor’s terms. The Maldives retains regulatory authority over its ports and airspace, and the study finds no evidence of automatic political control despite the concentration of Chinese financing in specific projects.

India’s response, the study argues, is neither a unified counter-encirclement strategy nor necessarily more effective than Chinese-backed projects. Instead, New Delhi combines sovereignty-based opposition to the BRI, particularly its passage through Pakistan-administered Kashmir, with alternative corridors such as the Chabahar port agreement with Iran and Afghanistan, the Kaladan multi-modal transit facility with Myanmar, and the India–Middle East–Europe Economic Corridor announced in 2023. India also pursues coalition finance through partnerships with Japan, the European Union and the United States, maritime public goods through the Information Fusion Centre for the Indian Ocean Region, and geocultural diplomacy through heritage projects such as Project Mausam and Buddhist circuit infrastructure. The study cites Timothy Winter’s concept of geocultural power to characterise how India deploys civilisational narratives alongside infrastructure, competing with China’s own geocultural claims along the Silk Road’s historical geography.

The study’s most significant contribution is conceptual: infrastructure diplomacy is a relational process, not a unilateral instrument. Project design, domestic institutions and recipient-state agency jointly condition whether economic involvement produces developmental benefits, fiscal vulnerability or strategic access. The authors draw on scholarship by Schindler, DiCarlo and Paudel on the rise of the twenty-first-century infrastructure state, and on Flint and Zhu’s geopolitics of connectivity, to argue that infrastructure is not simply a conduit for pre-existing power but a medium through which power is negotiated. This reframing challenges both the debt-trap narrative popular in Western commentary and the triumphalist narrative promoted by Belt and Road advocates, positioning recipient states as active negotiators rather than passive recipients.

The findings arrive at a moment when South Asia’s infrastructure competition is intensifying. China’s Belt and Road Initiative continues to expand through new frameworks, including a 2024 Belt and Road cooperation framework with Nepal and a 2025 joint press release with Bangladesh, while India deepens partnerships with France and Italy through joint statements in 2026 and strengthens Quad cooperation on maritime security. The study suggests that the region’s future will be shaped not by a single corridor’s dominance but by the ongoing negotiation among competing infrastructure offers, in which the terms of financing, the allocation of operating rights and the strength of domestic institutions determine whether ports and railways become instruments of leverage or vehicles of development. The authors’ analysis positions South Asian states as sovereign actors with real bargaining power, challenging the assumption that infrastructure competition inevitably produces strategic control, and offering a technical vocabulary for understanding when economic involvement converts into political influence and when it does not.

Subject of Research: Infrastructure diplomacy and uneven strategic leverage in South Asia: China’s Belt and Road Initiative and India’s competitive connectivity

Article Title: Infrastructure diplomacy and uneven strategic leverage in South Asia: China’s Belt and Road Initiative and India’s competitive connectivity

Article References: Mishra, M., & Patel, S. (2026). Infrastructure diplomacy and uneven strategic leverage in South Asia: China’s Belt and Road Initiative and India’s competitive connectivity. SN Social Sciences, 6(9), Article 357. https://doi.org/10.1007/s43545-026-01649-5

Image Credits: AI Generated

DOI: 10.1007/s43545-026-01649-5

Keywords: Infrastructure, diplomacy, uneven, strategic, leverage, South, Asia, China, Belt, Road, Initiative, India

The numbers tell a sobering story. According to the editorial’s synthesis of current data across 48 Asian countries, only two countries have established comprehensive phytosociological classification systems for their grasslands, and just one has fully adopted the International Vegetation Classification (IVC)/EcoVeg approach. Twenty-five countries rely on partial classifications, ten employ only informal local plot-based methods, twenty-two depend on coarse non-plot-based systems, and eleven have no grassland typology whatsoever. This methodological fragmentation stands in stark contrast to the continent’s ecological significance—Asia hosts over 60% of the global human population, contributes nearly 40% of global carbon emissions, and contains ten of the world’s top 35 biodiversity hotspots.

Asia’s grasslands are extraordinarily diverse, shaped by the continent’s participation in all major biomes and three biogeographic realms. Natural grasslands include temperate steppes, arctic-alpine grasslands, and tropical savannas, while azonal types driven by edaphic conditions rather than climate—such as saline grasslands, coastal dunes, riparian meadows, and wet grasslands—are widespread across the continent. Semi-natural and anthropogenic grasslands, formed by grazing, mowing, burning, or agricultural abandonment, add further complexity. This ecological variability supports rich biodiversity, including numerous endemic species and glacial relicts, and provides critical ecosystem services such as carbon sequestration and soil stabilization. Acting as “green barriers” and “water towers,” these grasslands are indispensable for Asia’s ecological security.

Despite this importance, these ecosystems face escalating threats from multiple directions. Overgrazing, agricultural expansion, rapid land-use changes, and climate change impose both long-term and short-term pressures. Habitat fragmentation, open-pit mining, eutrophication, afforestation, and infrastructure development exacerbate biodiversity losses. Socio-political shifts—including rural depopulation leading to grassland abandonment and restrictions on traditional pastoral practices—further intensify these pressures. Without standardized classification frameworks, researchers and policymakers lack the typological foundation needed to integrate ecological data across scales, develop ecosystem-specific management strategies, and prioritize conservation actions effectively.

The editorial traces its origins to the inaugural Asian Grassland Conference in 2022, a virtual event organized by the Eurasian Dry Grassland Group (EDGG) with support from the International Association for Vegetation Science (IAVS). Delegates identified the urgent need for collaborative approaches to grassland ecology, vegetation, and conservation across the continent. As a byproduct of the conference, workshops were organized on vegetation typologies in Asia and on the foundation of an IAVS Regional Section in Asia. This regional section was established in 2022 to promote vegetation ecology activities across the continent, and the Special Collection “Grasslands of Asia” represents its first special feature in an international journal—a joint enterprise between the EDGG and the Asian Regional Section.

Although the call for contributions was open to all classification approaches from all parts of Asia, the Special Collection ultimately comprises only seven articles from just four countries in West and Middle Asia. Four regions of Asia—Central Asia, South Asia, North Asia, and Southeast Asia—are entirely unrepresented, and many countries within the two included regions are also missing. Nevertheless, these seven contributions significantly advance the understanding of grassland typologies in their respective regions, ranging from detailed phytosociological analyses based on vegetation plots to broader investigations of grassland ecology and floristics.

In West Asia, Vynokurov and colleagues delivered the first syntaxonomic, plot-based classification of Armenia’s dry grasslands and thorn-cushion communities, proposing a potential new vegetation class distinct from the Euro-Siberian Festuco-Brometea and Anatolian Astragalo-Brometea. Based on 111 vegetation plots sampled during the 13th EDGG Field Workshop and supplemented with 487 plots from surrounding countries, the study classified Armenian plots into 12 vegetation clusters, describing three new orders, four alliances, and six associations. With a mean vascular plant richness of 46.8 species per 10 square meters—well above the Palaearctic dry grassland average of 33.7—the study highlights the unique biodiversity of Armenian grasslands.

Talebi and colleagues presented a pioneering syntaxonomic classification of vegetation along the southern slopes of Mt. Damavand, the highest summit in the Middle East at 5,610 meters, covering a 3,000-meter elevational gradient. The researchers distinguished six orders, nine alliances, and 18 association-level communities, many newly described. Noroozi and colleagues investigated the Dena Mountains, the highest peaks in the Zagros range, finding 242 taxa endemic to the Iranian Plateau and describing two new associations from scree habitats. Yaselyani and colleagues focused on the plant diversity of subalpine and alpine zones in the Central Zagros, where almost 20% of 308 listed species are endemic to Iran. In Middle Asia, Nowak and colleagues proposed a new vegetation class for pistachio woodlands across Tajikistan and Iran, while Świerszcz and colleagues explored graminoid distributions across open vegetation types in Tajikistan and Kyrgyzstan and classified subalpine forb steppes in the Pamir-Alai Mountains, proposing yet another new vegetation class.

The editorial identifies several barriers behind Asia’s classification gaps, including the continent’s immense geographic, ecological, and cultural diversity, alongside socio-political and economic challenges such as uneven research capacities, economic disparities, geopolitical tensions, language barriers, and restrictive visa policies. In regions like South and Southeast Asia, studies often remain fragmented and dominated by agricultural or forestry perspectives rather than typological classification. In North Asia, notable progress has been made through Russia’s national vegetation classification programme, with a three-volume prodromus documenting at least 250 grassland associations scheduled for publication beginning in 2025. In China, the China Vegetation Classification System represents a hierarchical framework integrating physiognomy, floristic composition, ecological attributes, and dynamic processes, though formal nomenclature remains descriptively presented rather than standardized.

Moving forward, the editorial calls for coordinated efforts at local, regional, and continental scales to develop a unified, continent-wide vegetation classification framework. Successful regional prototypes such as the Vegetation of Middle Asia database—encompassing over 5,800 relevés—and the Vegetation Database of Iran demonstrate how systematic data collection can serve as a foundation for comprehensive resources. Experiences from other continents, including Europe’s European Vegetation Archive, North America’s VegBank, and Australia’s TERN-AEKOS archive, show the substantial benefits of collaborative databases. The Asian Regional Section of the IAVS, with 117 members from 29 countries including 17 Asian nations, is uniquely positioned to facilitate this transition through workshops, field studies, and conferences. Strengthening vegetation classification frameworks and regional databases will bridge existing methodological gaps and provide critical support for conservation planning, sustainable management, and biodiversity research across Asia’s grassland ecosystems.

Subject of Research: Ecology

Article Title: Advancing vegetation classification of grassland ecosystems across Asia: current status and way forward

Article References: Naqinezhad, A., Biurrun, I., Chepinoga, V., Dengler, J., & Nowak, A. (2025). Advancing vegetation classification of grassland ecosystems across Asia: current status and way forward. Vegetation Classification and Survey, 6, 79-97. https://doi.org/10.3897/vcs.151773

Image Credits: AI Generated

DOI: 10.3897/VCS.151773

Keywords: grasslands, vegetation classification, biodiversity, Asia, conservation, phytosociology, Advancing, vegetation, classification, grassland, ecosystems, across

The research, published in Frontiers in Sustainable Food Systems, assembles a balanced panel of 3,672 country-month observations spanning Latin America, Asia, and the Europe-Middle East-Africa region. Countries were selected using strict criteria: they had to be classified as emerging markets by MSCI or the International Monetary Fund, operate floating rather than pegged exchange rate arrangements, avoid centrally administered food prices, and offer complete monthly data. Crucially, none of the selection rules conditioned on realized inflation behavior, which guards against the sample being rigged in favor of the study’s conclusions.

The methodological architecture is deliberately layered. In the first stage, Unuvar estimates a separate distributed lag regression for each country, regressing monthly food inflation on twelve lags of currency depreciation alongside six lags of Brent crude oil prices, the FAO Food Price Index, and urea fertilizer prices. Standard errors use the Newey-West correction for heteroskedasticity and autocorrelation up to twelve months. This country-by-country approach is not a stylistic choice: formal tests rejected slope homogeneity across the panel, and because global price series take identical values in every country each month, they would be perfectly collinear with time fixed effects in any pooled specification. Only country-level regressions allow the oil, food, and fertilizer channels to be separately identified.

The headline numbers are striking. The mean cumulative exchange rate pass-through coefficient is 0.213, meaning a ten percent currency depreciation over twelve months raises consumer food prices by roughly 2.1 percent on average. But the mean conceals extraordinary heterogeneity: estimates range from essentially zero in Indonesia to 0.807 in Türkiye, where pass-through is nearly four times the group average. Hungary follows at 0.505, with Chile and Colombia near 0.34. Only seven of the seventeen coefficients are individually significant at the five percent level, a reminder that any study reporting a single pooled elasticity for emerging markets describes a central tendency that applies to very few actual economies.

By contrast, the oil channel is remarkably weak at policy-relevant horizons. The cumulative effect of crude oil prices on consumer food prices is just 0.008 over six months — statistically indistinguishable from zero — and the entire oil-only specification explains roughly 0.4 percent of within-country variation in food inflation. The effect does become detectable at longer horizons, reaching 0.045 at twelve months and 0.064 at eighteen months, suggesting that energy costs seep into retail prices slowly through production and distribution. But the comparison remains lopsided: a ten percent oil price increase is associated with about a 0.5 percent rise in food prices, versus roughly 2.4 percent for an equivalent depreciation. A formal test rejects the equality of the two channels decisively.

Why is the energy-food nexus so muted at the consumer level? The study points to the structure of retail food prices, which bundle the raw commodity with processing, packaging, distribution, rent, and labor costs. In the United States, the farm share of the consumer food dollar was just 11.8 cents in 2024, with energy entering as one of twelve supply-chain industry groups rather than a dominant cost. Strong oil-commodity relationships observed at the wholesale level are therefore diluted before they reach the checkout. The exchange rate, by contrast, hits from multiple directions simultaneously: it raises the local-currency cost of imported fertilizers, seeds, and fuel, while also lifting the domestic prices of tradable agricultural goods outright.

The study’s most consequential finding concerns state dependence — the idea, originating with John Taylor’s 2000 work, that pass-through is not a fixed structural parameter but depends on the prevailing inflation environment. When inflation is low and expectations are anchored, firms treat cost shocks as temporary and absorb them into margins. When inflation is perceived as persistent, the same shock is passed through rapidly and almost entirely. Using a threshold specification based on observed twelve-month food inflation, the study finds cumulative pass-through of 0.147 below a fifteen percent annual inflation threshold and 0.541 above it — a difference of 0.393 that survives a Bonferroni correction for multiple testing. In practical terms, a ten percent depreciation raises food prices by about 1.5 percent in calm conditions but by approximately 5.4 percent when food inflation is already elevated.

Formal threshold estimation sharpens the picture. Applying Hansen’s panel threshold method, the transition point is estimated at 7.56 percent annual food inflation using overlapping six-month windows, and 6.83 percent with non-overlapping windows, with bootstrap p-values below 0.001 in both cases. Pass-through roughly triples across this divide, rising from about 0.07 to 0.23. Quantile regressions with country fixed effects corroborate the pattern from a different angle: cumulative pass-through climbs from 0.120 at the twenty-fifth percentile of the conditional food inflation distribution to 0.277 at the ninetieth, with equality strongly rejected. Notably, the oil and global food price channels show no comparable regime dependence, suggesting the state-dependent behavior is specific to the exchange rate transmission mechanism.

A skeptic might object that the high-inflation states are simply concentrated in countries with structurally stronger pass-through, such as Türkiye, rather than reflecting a within-country behavioral shift. The study confronts this directly with mean-group estimates that compare inflation states within each economy. The estimated difference is positive in all eight economies where both states can be reliably estimated, and the mean-group difference of 0.339 remains significant even after excluding Türkiye, which contributes fifty-five of the 190 high-inflation months. Kazakhstan, Romania, and Poland — countries with modest average pass-through — show some of the largest state-dependent jumps. Meanwhile, structural exposure indicators such as food import dependence, energy dependence, and fertilizer import dependence fail to explain cross-country variation, with the apparent link between average inflation and pass-through collapsing entirely once Türkiye is removed from the cross-section.

The policy implications are pointed. If exchange rate transmission is the dominant channel, then export bans and trade restrictions are misguided levers: they depress producer incomes and risk supply contractions without touching the mechanism that actually drives prices. Instead, the findings elevate macro-financial stability — exchange rate stability, anchored inflation expectations, and hedging instruments for importers — to the center of food price policy, with agricultural subsidies playing only a complementary role. The results also align with the United Nations Sustainable Development Goal 2.c, which targets the proper functioning of food markets and limits on extreme price volatility. As the study notes, regime dependence intensified after 2015, a period encompassing emerging market currency stress, the pandemic, and the war in Ukraine, hinting that weakening monetary credibility may itself amplify the food price consequences of currency turmoil. For the billions of households in emerging economies who spend a disproportionate share of their budgets on food, keeping inflation anchored may be the most effective food security program available.

Subject of Research: Exchange rate pass-through to consumer food prices and its threshold dependence on the inflation environment in emerging market economies

Article Title: Threshold effects in exchange rate pass-through to food prices in emerging market economies

Article References: Unuvar, F. I. (2026). Threshold effects in exchange rate pass-through to food prices in emerging market economies. Frontiers in Sustainable Food Systems, 10, Article 1960606. https://doi.org/10.3389/fsufs.2026.1960606

Image Credits: AI Generated

DOI: 10.3389/fsufs.2026.1960606

Keywords: exchange rate pass-through, food inflation, emerging market economies, oil prices, threshold effects, state dependence, food security, currency depreciation, Taylor hypothesis, quantile regression, panel data, monetary policy

The urgency behind this work stems from a dramatic rise in allergic disease across the Asia-Pacific region. Researchers attribute the rapid increase to a convergence of forces: global warming, extensive urbanization, the environmental pollution that accompanies it, and improved sanitation. Each of these factors alters exposure to allergens in distinct ways. Warming climates extend pollen seasons and introduce new plant species to regions that never encountered them before, while urbanization concentrates populations in polluted megacities where particulate matter interacts with inhaled allergens in ways that can amplify airway inflammation. Paradoxically, improved sanitation, which protects against infectious disease, may also skew immune development toward allergic responses, a phenomenon related to the hygiene hypothesis.

The geographical specificities of sensitization are striking. Cedar pollen stands as the main cause of hay fever in Japan, while the mite species Blomia tropicalis predominates in tropical regions. In Western countries, by contrast, sensitization to birch pollen and to the house dust mite Dermatophagoides pteronyssinus is far more prevalent. These differences are not merely academic; they determine which diagnostic panels are useful in a given region and which immunotherapeutic extracts will actually work. Yet many allergens in Eastern countries remain incompletely characterized, and most commercial diagnostic tools remain focused on Western sensitization profiles, leaving clinicians across Asia and the tropics to work with instruments that were never designed for their patients.

Food allergies add another layer of regional complexity. Certain foods consumed primarily in Asia may contribute to the development of region-specific food allergies. In Mongolia, horse milk allergy is relatively common, alongside lactose intolerance, because horse milk is often used as a substitute for children with cow’s milk allergy and fermented mare’s milk, known as airag, is a national staple. In Korea, some important allergens from fruits and vegetables that elicit pollen-food allergy syndrome have yet to be fully characterized. Individuals may also develop allergies to foods encountered for the first time in a foreign country, or to imported products, as a result of cross-reactivity with pollen allergens from their country of origin. The immune system, primed by one set of environmental proteins, can misidentify structurally similar proteins in unfamiliar foods as threats.

Perhaps most surprising is the discovery that allergenic components can be found in traditional and herbal medicines. Researchers have identified Pana g 1, a ginseng allergen homologous to the birch pollen allergen Bet v 1, in some ginseng beverages. Japanese hop, Humulus japonicus, is widespread in far east Asian countries and is now invasive in Western countries, meaning that a weed once confined to one hemisphere is becoming a pollinosis problem in the other. These examples underscore why the editorial’s authors emphasize the need to investigate the similarities and differences between regional particularities in Asia and the tropics and those observed in Western industrialized countries, since cross-reactivity networks span continents.

The five articles collected in the current Research Topic reflect both the rapid growth of knowledge and the critical need to characterize regionally important allergens. Two articles focused on sensitization patterns in eastern China, while three studies addressed molecular diagnosis in Thailand, Colombia, and India. In a retrospective analysis from eastern China, Dermatophagoides pteronyssinus emerged as the most common respiratory allergen source at 37.58 percent, followed by mold at 13.11 percent. Cashew nut was the most frequently identified food allergen at 15.57 percent, followed by cow’s milk at 10.99 percent and egg at 9.33 percent. These findings represent a distinct sensitization pattern that may reflect regional, lifestyle, and cultural differences, and they suggest that cashew nut, rather than peanut, may deserve greater attention in Asian food allergy screening.

One of the Chinese studies, led by Huang and colleagues, investigated differential food sensitization patterns among infants, toddlers, and children. Their results suggest that sensitization patterns emerge early in life, highlighting the need for differentiated allergy risk management and prevention strategies across different developmental stages. This finding carries significant implications for pediatric practice, because it suggests that the window for intervention may open much earlier than previously assumed, and that a one-size-fits-all prevention protocol may fail to protect children at different ages from different allergen threats.

The molecular diagnosis studies from Southeast Asia and South America demonstrate how component-resolved diagnostics can outperform traditional extract-based testing. Kulalert and colleagues in Thailand reported better diagnostic performance of specific IgE measurement for shrimp tropomyosin, the major shellfish allergen protein, than that of the skin prick test and specific IgE measurement using whole shrimp extract. This matters because tropomyosin is a highly cross-reactive protein found across crustaceans and mollusks, and measuring IgE against the purified component rather than a crude extract reduces false positives from IgE that binds irrelevant proteins in the extract. Marrugo and colleagues in Colombia demonstrated that molecular diagnosis using combinations of specific allergens can improve diagnostic accuracy, potentially supporting personalized allergy management in a tropical setting where allergen exposure differs markedly from temperate regions.

In India, Ghosh and colleagues evaluated the diagnostic value of recombinant Asp f 10, a secreted aspartic protease from Aspergillus fumigatus, and Asp f 10-specific IgG as a biomarker for allergic bronchopulmonary aspergillosis, a severe inflammatory lung disease caused by hypersensitivity to Aspergillus antigens in patients with asthma or cystic fibrosis. Identifying reliable molecular biomarkers for this condition is critical because current diagnostic criteria rely on a constellation of clinical, radiological, and immunological findings that can be difficult to interpret consistently across different healthcare settings. A specific molecular marker could standardize diagnosis and enable earlier treatment initiation.

Taken together, the studies in this second volume make clear that a rapidly growing body of knowledge is emerging regarding novel allergens from Asian and tropical regions. Certain sensitization patterns may be specific to these geographic areas, which encompass temperate to tropical climates and harbor diverse endemic flora and fauna. Although many of these allergens can exhibit cross-reactivity with allergens from similar sources in other regions, the integration of Asia- and tropics-specific components into diagnostic panels will improve the diagnosis of allergic sensitization in these regions of the world. For the billions of people living across Asia and the tropics, the message is unambiguous: allergy medicine must finally look like the populations it serves, and the molecular tools to make that possible are arriving at precisely the moment they are needed most.

Subject of Research: Editorial: Allergens and allergic sensitization in Asia and the tropics—volume II

Article Title: Editorial: Allergens and allergic sensitization in Asia and the tropics—volume II

Article References: Jeong, K. Y., Jacquet, A., Leung, T. F., & Li, P. H. (2026). Editorial: Allergens and allergic sensitization in Asia and the tropics—volume II. Frontiers in Allergy, 7, Article 1973136. https://doi.org/10.3389/falgy.2026.1973136

Image Credits: AI Generated

DOI: 10.3389/falgy.2026.1973136

Keywords: allergic sensitization, molecular diagnosis, Asia-Pacific allergy, tropical allergens, component-resolved diagnostics, food allergy, Frontiers in Allergy, Editorial, Allergens, allergic, sensitization, Asia

The review, led by Bibaisha Iliasovna Nurdauletova of Sh. Yessenov Caspian University of Technologies and Engineering in Aktau, together with colleagues from Yessenov University, L. N. Gumilyov Eurasian National University, and the University of Dodoma, uses a structured narrative and conceptual-synthesis methodology to compare how place names moved across languages, scripts, manuscript genres, and political regimes. Rather than treating the linguistic layers of the region as a single synchronic mass, the authors build a diachronic framework that separates pre-Islamic external attestations, medieval Arabic-Persian documentation, early-modern cartography, imperial and Soviet standardisation, and post-Soviet renaming. The final evidence base comprised 138 unique references after relevance screening and de-duplication, with direct evidence from the five-state core given primary interpretive weight and material from neighbouring regions such as the Tarim Basin, Xinjiang, the Iranian plateau, Russia, and China used only where it documented transmission corridors, external attestations, or methodologically comparable mechanisms.

The authors’ central conceptual move is to operationalise toponymy as a sociopolitical knowledge infrastructure. In their framework, a place name functions infrastructurally when it identifies a spatial referent consistently enough for repeated use, links that referent to an administrative, route, jurisdictional, fiscal, or cartographic record, and is reproduced through an institution with authority to maintain, standardise, or replace the recorded form. This is not a metaphor, the authors stress, but a testable criterion: a case qualifies as a knowledge infrastructure only when three components can be identified together, namely a named spatial referent, an institutional record or documentary genre that reproduces the name, and a governance function such as route management, gazetteer standardisation, or cartographic assertion. When a name is renamed or orthographically standardised, what changes is not merely a label but the identifier through which a place is retrieved and related to institutional knowledge.

Each of the three major manuscript traditions encoded Middle Asian space differently. Arabic geographical writing recorded the region through routes, urban sequences, commercial connections, and regional description, in which practical sequence and connectivity could matter more than metric distance. Yet Arabic orthography, which typically omits short vowels, does not encode every contrast required for Turkic phonological reconstruction, generating transliteration instability that must be kept distinct from genuine linguistic change. Persian historiographical and administrative writing provided a second channel, stabilising names of oasis centres, dynastic territories, fiscal districts, and routes in the Bukhara-Samarkand and Khorezm zones, where Persian literary and bureaucratic practice interacted continuously with Turkic naming to produce transliterations, Persianised forms, and hybrid names. Chinese dynastic and gazetteer traditions, meanwhile, offered an external eastern witness, rendering foreign names through Chinese characters whose historical pronunciations and graphic conventions changed over time, a logographic approximation that introduces its own systematic distortion.

The review’s micro-cases make the analytical stakes concrete. The clearest cross-script case concerns the Khorezmian centre recorded variously as Koneurgenish, Gurganj, Jurjaniya, and Urgench. A Turkmenistan study cited in the review documents Chinese forms such as Yue-gan alongside Khorezmian Gurganj and Arabic-source variants, and analyses the earlier form morphologically as Gurgan plus a second element glossed as city. Crucially, the Persian-language Tarikh-i Jahangusha of Juvayni preserves Jurjaniya and Urgench as alternative designations for the same centre, providing an explicit Persian historiographical stage alongside the Chinese and Arabic evidence. The review separates four analytically distinct operations in this case: character-based phonetic approximation in the Chinese witness, Arabic-source exonymic and orthographic variation, Persian historiographical transmission, and a proposed morphological reduction within the Gurganj lineage. The semantic proposal of a city of Gurgan is kept separate from the phonological comparison and treated as a source-dependent etymology rather than a demonstrated sound law.

A second micro-case, drawn from source-critical scholarship on the Bukhara oasis, concerns the Chinese form Niumi and its proposed relationship to the Numijkat, Nokmitan, and Bukhara cluster. Published historical-phonological comparison reports Niumi as Middle Chinese with reconstructed values that have been compared with Sogdian Nōk-mētān, meaning New Residence, providing an empirical example of period-specific segmental comparison rather than inference from modern Mandarin or graphic resemblance. The review retains these as separate evidence layers whose equivalence must be demonstrated through historical phonology, chronology, and relative geography, and explicitly refuses to invent period-specific phonetic transcriptions where the cited evidence does not support them. A third case, Dargan on the Amu Darya route, shows the opposite problem: referential continuity from medieval Arabic sources to the modern Dargan-Ata is strong, but the root etymology, with competing explanations including an association with a term in the semantic field of boatman, remains a hypothesis rather than a settled reconstruction.

The review also distinguishes transformation mechanisms that require different reconstructive controls. Phonetic distortion arises structurally when names move among scripts with non-equivalent phonemes, and administrative standardisation may regularise previously unstable variants. Semantic translation transfers descriptive content while changing linguistic form, as in the North Kazakhstan hydronyms Aksu, combining ak meaning white with su meaning water, and Karasu, whose interpretation depends on local associations with water source, flow, and landscape. Political renaming, by contrast, is an intentional transformation produced through official nomenclature and regime transition, and the review treats the documented sequence from Pishpek to Frunze to Bishkek in Kyrgyzstan as administrative replacement rather than regular sound change. The authors insist that these mechanisms remain analytically separate: collapsing them would convert apparent variant spellings into false sound laws and obscure the dated institutional acts that often make political renaming the most precisely datable transformation in the record.

Manuscript cartography adds a spatial dimension to the philological analysis. The review examines Anthony Jenkinson’s sixteenth-century map of the region, whose representation of the Caspian Sea, the Oxus, Tashkent, and Samarkand can be compared with modern coordinates to identify changes in relative position and route geometry. The comparison is qualitative, testing relative spatial correspondence and displacement visually rather than deriving a metric from a schematic historical representation. More broadly, the review draws on cartographic theory showing how maps participate in the production of territorial authority: a label’s presence, absence, scale, or centrality on a historical map is evidence about the institution that produced it and cannot be read as a neutral measure of local importance.

Three methodological bottlenecks constrain toponymic reconstruction, the review argues. Chronostratigraphic attribution must separate the date of a naming event from the date of first surviving attestation, later copying, and administrative standardisation, since a Turkic surface form may incorporate older substrate material and written attestation may postdate the naming event. Cross-script harmonisation must relate script-specific forms to plausible spoken originals without projecting modern pronunciation backward onto medieval spellings; the review prescribes an ordered protocol that preserves source graphemes, retains scholarly transliteration as the primary Romanised form, evaluates Arabic and Persian consonantal frames separately from absent short vowels, compares Chinese transcriptions only against period-appropriate historical reconstructions, and accepts proposed correspondences only when compatible with the phonotactics and documented adaptation practices of the relevant languages. Cartographic-textual integration, finally, must test whether a linguistic identification is spatially credible against route sequence, hydrology, travel distance, and neighbouring settlements, since a proposed match remains weak if the corresponding site is incompatible with these controls.

Digital and computational methods, the review concludes, can address these bottlenecks when provenance and uncertainty remain visible throughout the workflow. The proposed infrastructure has four components: GIS-linked manuscript mapping that aligns historical maps, itinerary descriptions, manuscript place lists, and archaeological coordinates within a common spatial framework; cross-script and phonological matching that generates ranked candidate correspondences with explicit phonological steps and provenance, using automated string similarity only for candidate generation; route-network modelling that treats toponyms as nodes in historically constrained mobility systems, testing proposed manuscript routes against seasonally feasible travel corridors, topography, and water availability; and interoperable historical gazetteers that preserve each attested form, script, date, source, proposed correspondence, coordinate estimate, and confidence value as separate but linked records. The authors argue that a five-state Middle Asian gazetteer built on these principles would move the field from dispersed inventories toward reproducible historical-geographical reconstruction while preserving the linguistic and manuscript complexity that gives Middle Asian toponymy its evidentiary value, and that publishing unresolved variants rather than forcing premature harmonisation is essential to that project.

Subject of Research: Toponymic knowledge infrastructures in five-state Middle Asia: linguistic transformation, manuscript cartography, and historical-geographical reconstruction

Article Title: Toponymic knowledge infrastructures in five-state Middle Asia: linguistic transformation, manuscript cartography, and historical-geographical reconstruction

Article References: Nurdauletova, B. I., Saparbaikyzy, S., Artykbaev, Z. O., Kairken, T. Z., Spatayeva, S., & Shilunga, E. (2026). Toponymic knowledge infrastructures in five-state Middle Asia: linguistic transformation, manuscript cartography, and historical-geographical reconstruction. Frontiers in Sociology, 11, Article 1876337. https://doi.org/10.3389/fsoc.2026.1876337

Image Credits: AI Generated

DOI: 10.3389/fsoc.2026.1876337

Keywords: toponymy, Central Asia, historical geography, manuscripts, cartography, digital humanities, Toponymic, knowledge, infrastructures, five-state, Middle, Asia

Functional constipation is not a disease in the classic sense. It is a functional gastrointestinal disorder, meaning the bowel itself is structurally normal, yet the coordinated mechanics of defecation go awry. Children with the condition pass hard or infrequent stools, strain painfully, and sometimes develop fecal impaction with overflow soiling. The diagnostic gold standards are the Rome III and Rome IV criteria, internationally agreed symptom checklists that allow clinicians to label a child’s constipation as functional rather than caused by anatomic, metabolic, or neurological abnormalities. The distinction matters enormously. Missing an organic cause, such as Hirschsprung disease or hypothyroidism, can be dangerous, while overdiagnosing organic disease in a child who simply needs dietary adjustment leads to unnecessary invasive testing.

Why should a prevalence study of constipation generate excitement? Because the burden is larger than most people appreciate. Untreated functional constipation in childhood is linked to bladder and bowel dysfunction, recurrent urinary tract infections, and behavioral difficulties, and it frequently persists into adolescence and adulthood. Children with chronic constipation report lower quality of life, and parents often underestimate the problem, assuming the child will simply grow out of it. In many Asian healthcare settings, cultural taboos around discussing bowel habits mean families delay seeking help until complications such as painful withholding behavior or encopresis have already taken root. A reliable estimate of how many children are affected is the first step toward allocating clinical resources, training pediatricians, and designing public health messaging.

The research team followed PRISMA guidelines for systematic reviews and prospectively registered their protocol with PROSPERO under registration number CRD420251274382. They searched six major databases, MEDLINE via PubMed, Embase, the Cochrane Central Register of Controlled Trials, LILACS, CNKI, and Ichushi-Web, from inception through December 30, 2025. Crucially, they also combed the grey literature, including conference proceedings, dissertations, and clinical trial registries, which often harbor studies that never reach mainstream journals. To qualify, studies had to be cross-sectional in design, apply Rome III or Rome IV diagnostic criteria, and report functional constipation prevalence in individuals aged zero to eighteen. This methodological rigor matters because prevalence meta-analyses are notoriously vulnerable to cherry-picking and inconsistent case definitions.

For the statistical synthesis, the authors used a random-effects meta-analysis of proportions with logit transformation, the standard technique for combining prevalence estimates that do not follow a normal distribution. Heterogeneity, the statistical term for variability among study results beyond what chance would explain, was quantified with the I-squared statistic and Cochran’s Q test. The pooled prevalence came out at 8 percent, with a 95 percent confidence interval of 5 to 11 percent. But here is the twist that the authors themselves emphasize: the I-squared value was a staggering 99.8 percent, and the 95 percent prediction interval stretched from 1 percent to 25 percent. In plain language, the true prevalence in any given Asian setting could plausibly be anywhere between nearly negligible and one in four children.

That prediction interval is the most scientifically honest part of the paper. A confidence interval tells you about the precision of the average estimate; a prediction interval tells you where a new study’s result would likely fall. When that interval spans nearly the entire plausible range, the pooled 8 percent figure cannot be treated as a precise, generalizable number for the continent. The authors are refreshingly candid about this, warning that the result should be interpreted with caution and highlighting substantial methodological and contextual variability across the included studies. Rather than undermining the work, this transparency strengthens it. Too many meta-analyses present a single tidy number and leave readers unaware that the underlying data are wildly discordant.

The subgroup analyses reveal where that variability comes from. Prevalence was numerically higher in adolescents, at 13 percent, than in young children aged zero to six, at 7 percent, a pattern that may reflect accumulated years of withholding behavior, dietary shifts, and school-related toileting avoidance. Setting mattered too: school-based studies reported 13 percent, compared with just 5 percent in community settings, likely because school surveys capture children whose symptoms are visible in daily routines, while community sampling may undercount or reflect different response patterns. Geography played a role as well, with estimates ranging from 6 percent in Southeast Asia to 10 percent in West Asia. Intriguingly, the choice of diagnostic criteria made almost no difference, with both Rome III and Rome IV studies converging on 10 percent, suggesting the two symptom frameworks identify largely overlapping populations.

The team also stress-tested their result. A leave-one-out sensitivity analysis, in which each study is removed in turn and the pooled estimate recalculated, confirmed that no single study was driving the overall figure. Publication bias assessment was performed to check whether small studies with striking results were disproportionately represented. These checks are the difference between a meta-analysis that merely aggregates numbers and one that earns scientific trust. Still, the extreme heterogeneity signals that future research must move beyond simply counting cases. Standardized diagnostic protocols, consistent age stratification, and geographically diverse sampling frames are needed before the true regional picture of pediatric bowel health in Asia can be drawn with confidence.

What should clinicians and parents take away? First, functional constipation is common enough that pediatricians should screen for it routinely rather than waiting for families to raise the topic. Second, the higher apparent prevalence in school-age children and adolescents suggests that interventions targeting school environments, accessible toilets, adequate drinking water, and time to use them, could have outsized impact. Third, the variation between hospital, community, and school settings is a reminder that where you look shapes what you find, and that hospital-based samples likely overrepresent the more severe end of the spectrum. The authors call for regionally tailored interventions, an acknowledgment that dietary patterns, toilet training customs, and healthcare access differ dramatically from East Asia to West Asia.

The study, funded by the Tianjin Medical University General Hospital Youth Backbone Fund Project, ultimately delivers a dual message. On one hand, it consolidates the best available evidence and gives Asian health systems a defensible baseline: roughly 8 percent of children, with plausible local rates from 1 to 25 percent. On the other hand, it is a masterclass in statistical humility, showing how a single pooled estimate can conceal enormous real-world diversity. For a condition that is cheap to treat when caught early but costly in suffering when ignored, that combination of a solid baseline and an honest accounting of uncertainty is exactly what the field needs to push forward.

Subject of Research: Prevalence of functional constipation among Asian children and adolescents

Article Title: Prevalence of functional constipation in Asian children and adolescents: a systematic review and meta-analysis of cross-sectional studies

Article References: Wu, X., Zhang, G., Ji, F., Fu, H., Ren, B., Guo, Z., & Sun, D. (2026). Prevalence of functional constipation in Asian children and adolescents: a systematic review and meta-analysis of cross-sectional studies. BMC Pediatrics. https://doi.org/10.1186/s12887-026-07716-3

Image Credits: AI Generated

DOI: 10.1186/s12887-026-07716-3

Keywords: functional constipation, pediatrics, adolescents, meta-analysis, prevalence, Rome IV criteria, Asia, cross-sectional studies, gastroenterology, public health, systematic review, child health