The research team, working at the Gansu Gannan Grassland Ecosystem National Observation and Research Station at roughly 3,540 meters above sea level, set up five paired plots in June 2024. In each pair, one 5-by-5-meter plot was centered on an 8,000-kelvin white LED streetlamp mounted three meters above the ground, switched on nightly from 19:30 to 05:30 in step with local sunset, while the matching control plot held an identical unlit pole. The lit plots averaged 4.52 lux—right in line with local urban street lighting—whereas control plots stayed below 0.1 lux. From July through August, observers recorded flower visits at night with night-vision equipment and by day with standardized camera surveys, logging every insect that contacted the reproductive parts of a flower and identifying visitors to species or morphospecies using reference collections.

The scale of the dataset—2,160 nocturnal and 3,381 diurnal plant–pollinator interactions across 29 night-blooming and 40 day-blooming plant species—allowed the researchers to build quantitative interaction networks for each plot, time period, and replicate block, and to calculate three classic structural metrics: connectance, nestedness, and modularity. Connectance measures the density of links in a network, nestedness describes how specialist species interact with subsets of the partners of generalists, and modularity captures how strongly the network splits into isolated subgroups. Together, these metrics describe the architecture that underpins the stability and resilience of mutualistic communities.

At night, the effects were dramatic. Overall flower visitation fell by 35.4 percent under the lamps, driven overwhelmingly by moths: Lepidopteran visits collapsed by 57.5 percent, consistent with the well-documented phototactic behavior of nocturnal moths, which rely on celestial light cues for navigation and become disoriented, exhausted, or exposed to predators under artificial illumination. Yet the story was not one of simple loss. Dipteran visitation surged by 179.6 percent, largely on caraway (Carum carvi) and Bupleurum chinense, as typically day-active flies from families such as Tachinidae, Sarcophophidae, and Syrphidae extended their activity into the illuminated night. Beetles and bees showed no significant response.

These behavioral shifts translated directly into network reorganization. Nocturnal network nestedness plummeted by 64.7 percent, while modularity rose by 12.8 percent; connectance was unchanged. Statistically, the loss of nestedness tracked both total visitation and moth visitation under the lamps, supporting the idea that interaction structure is abundance-driven: as moths vanished from the illuminated flowers, the hierarchical fabric of the network frayed, and the opportunistic flies could not compensate. The rise in modularity, negatively correlated with visitation by both flies and moths, indicates that reduced activity by highly mobile pollinators weakened the links between subgroups, leaving a more compartmentalized community in which interactions concentrate within isolated clusters.

The functional stakes are considerable. Moths and flies differ in how effectively they transfer pollen, so a wholesale substitution of flies for moths may reduce pollination success even when visitation counts appear healthy. Previous work has shown that light pollution can cut pollination network nestedness severely and depress seed set in night-pollinated plants, and the new results reinforce the concern that ALAN does not just reshuffle who visits which flower—it may erode the reproductive output of entire plant communities, with consequences that compound over seasons.

What makes the study genuinely surprising is what happened during the day. Total diurnal visitation did not change significantly, but the composition of visitors shifted sharply: bees, butterflies, and beetles declined by 20.0, 51.8, and 61.7 percent respectively, while flies increased by 46.3 percent, partially offsetting the losses. Species-level contrasts pinpointed the winners and losers—bee visits dropped mainly on Oxytropis ochrocephala, butterfly visits on Anaphalis hancockii, and beetle visits on Stellera chamaejasme and Dasiphora fruticosa—while flies flocked to edelweiss-like Leontopodium, thistles, and Bupleurum. In other words, lamps burning only at night reorganized the daytime pollinator community.

Diurnal network structure shifted accordingly. Connectance rose by 16.1 percent, positively correlated with fly visitation and negatively with bee visitation, reflecting the generalized, multi-species foraging habits of Diptera: as flies took over, the network accumulated more links and became more densely connected, even as its modular and nested architecture stayed statistically intact. The authors propose several non-exclusive mechanisms for this cross-temporal carry-over. Artificial light can disrupt plant circadian regulation of nectar production and scent emission, altering when floral rewards become available and disadvantaging scent-dependent groups. It can also disturb the circadian rhythms or nocturnal larval stages of day-active insects such as butterflies. And because light-suppressed moths consume less nectar at night, a resource surplus may linger into the morning, favoring flexible daytime flies.

The choice of study system sharpens the message. Alpine meadows above 3,000 meters endure short growing seasons, pollen limitation, and heavy dependence on a few generalist pollinators such as bumblebees, leaving little slack for disruption. Although the Tibetan Plateau currently has the lowest light pollution levels in China, it has experienced the fastest growth of any region over recent decades, particularly in the east. Studying ALAN in this relatively pristine setting isolates the effect of light from the urban stressors—habitat loss, pesticides, heat—that usually confound light-pollution research near cities, and the results suggest that even remote ecosystems are vulnerable as lighting footprints expand.

The authors caution that their experiment captures responses over a single flowering season, and whether the observed structural shifts persist, accumulate, or trigger long-term declines in plant reproduction and pollinator populations remains an open question for multi-year studies. Still, the conclusion is difficult to escape: artificial light at night acts as a pervasive ecological disturbance that propagates through time, reorganizing mutualistic networks in both darkness and daylight. As global artificial lighting continues its rapid expansion, the researchers argue that conservation strategies must treat light pollution as a key environmental stressor in its own right, prioritizing optimized nighttime lighting regimes—dimmer, warmer, better shielded, and switched off where possible—to protect ecosystems that evolved under the rhythm of the stars.

Subject of Research: Effects of artificial light at night on nocturnal and diurnal plant–pollinator interaction networks in alpine meadows

Article Title: Artificial Light at Night Alters Both of Nocturnal and Diurnal Pollination Networks in Alpine Meadows

Article References: Lu, N., Wang, Y., Cai, W., Chen, Y., Yin, L., Chen, X., Cao, J., & Luo, Q. (2026). Artificial Light at Night Alters Both of Nocturnal and Diurnal Pollination Networks in Alpine Meadows. Ecology and Evolution, 16(10), Article e74368. https://doi.org/10.1002/ece3.74368

Image Credits: AI Generated

DOI: 10.1002/ece3.74368

Keywords: artificial light at night, light pollution, pollination networks, alpine meadows, moths, Diptera, plant–pollinator interactions, network ecology, Qinghai–Tibetan Plateau, nestedness, modularity, insect decline

The research team, led by Mikel A. González of the SASTI Group in Madrid together with colleagues from the University of Córdoba, the Center for Rickettsiosis and Arthropod Vector-Borne Diseases in La Rioja, Clemson University, and the University of Zaragoza, focused on three summer mountain meadows in La Rioja, a region of northern Spain where transhumance-style grazing still brings cattle to upland pastures during the warm months. The choice of location was deliberate. Livestock grazing exposes animals to arthropods of veterinary importance, particularly in summer, and many fly species affect cattle both directly, through swarming and biting that cause stress and blood loss, and indirectly, by transmitting parasites and pathogens. Severe infestations can depress weight gain and milk yield and, in extreme cases, kill animals. Yet, as the authors note, knowledge of which pest species actually share these high-elevation habitats with grazing cattle remained remarkably thin.

To capture that hidden diversity, the team deployed a combination of sampling techniques rather than relying on any single method. The workhorse of the survey was the suction light trap baited with dry ice, a CDC-style design in which carbon dioxide released from sublimating dry ice mimics the breath of a large mammal and draws in host-seeking flies, which are then pulled into a collection chamber by a small fan. Traps were complemented by hand-netting flies around cattle, with ranchers supervising the collections directly on the animals, and by dipping aquatic habitats for larvae and pupae of species whose immature stages develop in water. This multi-pronged strategy matters because different fly families respond to different cues: some are strongly attracted to light and carbon dioxide, others are best caught in flight around their hosts, and some, such as bot flies, are rarely captured by conventional adult sampling at all.

The results paint a detailed picture of the summer fly fauna. In total, 6,372 specimens were collected, representing at least 53 species in eight dipteran families of veterinary importance. The single most abundant family was the Muscidae, the house fly relatives, with 2,118 specimens, including 14 individuals of the horn fly Haematobia irritans, a notorious blood-feeding pest of cattle that spends nearly its entire adult life clinging to the hides of its hosts. Close behind came the blackflies, family Simuliidae, with 1,843 specimens belonging to at least 10 species, a reminder that these small, hump-backed insects, famous for their painful bites, thrive in the cool running waters that drain mountain landscapes. Biting midges of the family Ceratopogonidae accounted for 1,072 specimens representing 20 species, making them the most species-rich group in the survey, followed by 708 mosquitoes of nine species, 505 horse flies and deer flies of the family Tabanidae spanning at least seven species, and 105 moth flies of the family Psychodidae in two species.

Two rarer finds rounded out the inventory and underscored the value of intensive sampling. Six specimens of the louse fly Hippobosca equina, a winged ectoparasite that scuttles through the hair of large mammals, and a single specimen of the horse stomach bot fly Gasterophilus intestinalis were recorded. The bot fly capture is particularly noteworthy because adult Oestridae are elusive, short-lived insects that do not feed and are almost never attracted to baited traps, so their appearance in a survey of this kind is a genuine stroke of fieldwork luck. Each of these species carries its own veterinary profile, from the mechanical irritation and disease transmission potential of muscids to the voracious blood-feeding of tabanids, which are capable of transmitting pathogens such as anaplasmosis agents between animals during interrupted blood meals.

Beyond the raw counts, the study examined when and where fly activity peaked, using generalized linear models, a flexible statistical framework that can handle the non-normal count data typical of insect surveys. The models indicated that total Diptera abundance varied significantly among sampling periods, among locations, and among the target fly groups. Most taxa peaked in early or midsummer, a seasonal pattern with direct management implications, because it identifies the windows when cattle are most heavily exposed to biting pressure and when vector-borne disease risk, if present, would be expected to climb. The variation among locations also suggests that local habitat features, such as the proximity of streams suitable for blackfly larvae or damp depressions where biting midges breed, shape the composition of the pest community at each pasture, meaning that control strategies may need to be tailored site by site rather than applied uniformly across a region.

A major technical strength of the study lies in its integration of classical morphology with DNA barcoding. Species were identified using traditional anatomical characters, then cross-checked by sequencing the COI gene, cytochrome c oxidase subunit I, the standard molecular marker for animal species identification. The resulting barcode sequences were compared against reference databases in the Barcode of Life Data System, allowing the team to confirm identifications and flag specimens whose morphology alone might have led to ambiguity. This dual approach is especially valuable in groups like blackflies and biting midges, where closely related species can be nearly indistinguishable under a microscope yet differ in their capacity to transmit pathogens such as the viruses responsible for bluetongue and epizootic hemorrhagic disease, both of which are listed among the study’s focal concerns.

To push the taxonomic resolution even further, the researchers carried out phylogenetic analyses for three of the most challenging families: the Muscidae, the Simuliidae, and the Culicidae. Using maximum likelihood methods, a statistical approach that finds the evolutionary tree best explaining the observed DNA sequence variation, and evaluating branch support with measures such as the Shimodaira–Hasegawa-like approximate likelihood ratio test and ultrafast bootstrap values, they reconstructed the relationships among the collected species. The effort generated 55 novel nucleotide sequences corresponding to 16 species, all deposited in GenBank for future researchers to consult. Genetic divergence analyses, computed with the Kimura 2-parameter model commonly used in DNA barcoding, helped delineate species boundaries within the blackfly genus Simulium, a group notorious for cryptic species complexes that can hide distinct vector capacities behind near-identical anatomy.

The practical significance of the work extends well beyond an inventory. By establishing which fly species are present, how abundant they are, and when their populations crest through the grazing season, the study provides the foundational data needed for monitoring and management programs targeting pest and vector flies in European grazing systems. Surveillance programs for diseases such as bluetongue depend on knowing where potential vector species occur and in what numbers, and this survey delivers exactly that information for a habitat type, mountain meadow pasture, that had previously been a blind spot. The findings also give ranchers a scientific basis for timing protective measures, from repellents and ear tags to pasture rotation, around the periods of peak fly activity rather than relying on guesswork.

There is also a broader ecological story here. Mountain pastures are changing under the combined pressures of shifting land use and a warming climate, and the composition of their insect communities is likely to shift in response. Species once confined to lower, warmer elevations may move upslope, bringing with them new biting pressure and new disease transmission risks for livestock that have never encountered them. Baselines like the one now established for La Rioja are the reference points against which such changes will be measured. As the authors emphasize, this is the first comprehensive dataset on the diversity and seasonal dynamics of veterinary flies associated with cattle in the mountain meadows of northeastern Spain, and it transforms a region of anecdotal observation into one of documented, quantified, and genetically verifiable entomological record, ready to support the next generation of livestock health research across Europe’s grazing highlands.

Subject of Research: Diversity and seasonal dynamics of veterinary Diptera in mountain livestock pastures of northeastern Spain

Article Title: Biodiversity of Diptera of veterinary importance in mountain livestock pastures of northeastern Spain

Article References: González, M. A., Bravo-Barriga, D., Oteo, J. A., Adler, P. H., & Ruiz-Arrondo, I. (2026). Biodiversity of Diptera of veterinary importance in mountain livestock pastures of northeastern Spain. Parasites & Vectors. https://doi.org/10.1186/s13071-026-07704-7

Image Credits: AI Generated

DOI: 10.1186/s13071-026-07704-7

Keywords: Diptera, cattle grazing, mountain meadows, COI barcoding, blackflies, biting midges, mosquitoes, horse flies, ectoparasites, vector-borne disease, La Rioja, livestock health

A recent study published in the journal Parasites & Vectors addresses this gap by examining the genetic diversity and morphological characteristics of Aedes koreicus in South Korea. The research team, led by Junyoung Lee and colleagues from Korea University and the Korea Disease Control and Prevention Agency, aimed to compare these native populations with those established in Europe. By analyzing both genetic markers and physical traits, the researchers sought to determine whether the European populations could have originated solely from Korea or if other regions within the species’ native range might have contributed to the invasion.

To assess genetic diversity, the researchers obtained DNA from 172 specimens of Aedes koreicus collected from 19 different populations across South Korea, including the island of Jeju. They utilized the mitochondrial cytochrome c oxidase subunit I (COI) marker to evaluate population structure. To provide a comparative baseline, the study included 147 European sequences and one northern Chinese sequence that were already available in the GenBank database. This approach allowed for a direct comparison between the native Korean genetic pool and the established European populations.

The genetic analysis identified a total of 23 distinct COI haplotypes among the 172 South Korean specimens. The most frequent and widely distributed haplotype, designated as H2, was found in 116 of the 172 specimens, representing 67.4% of the sample. This haplotype was present at 17 of the 19 sampling sites, indicating a high degree of prevalence within the native range. In contrast, the 147 European sequences analyzed comprised 35 different haplotypes. Notably, only one of these, H2, was shared between the South Korean samples and the German sequences, suggesting a limited overlap in the most common genetic variants between the two regions.

Statistical comparisons further highlighted the genetic distinctions between the populations. Pairwise FST comparisons revealed significant differentiation among the Korean Peninsula, Jeju Island, and most European regions, with the exception of Germany. Analysis of Molecular Variance (AMOVA) supported these findings, confirming genetic structuring among these three groups. These results indicate that while there is some genetic connectivity, particularly with German populations, the South Korean populations are genetically distinct from many other European groups. This differentiation challenges the hypothesis that a single source region in Korea accounts for the entire European invasion.

In addition to genetic markers, the study examined morphological characters to provide further evidence regarding population origins. The researchers analyzed 520 specimens from 40 localities in South Korea, evaluating physical traits that had been previously reported in European studies. The morphological characteristics of the South Korean populations, including those from Jeju Island, were found to be similar to those reported from Germany. These traits fell within the range of variation previously documented from Korean specimens, suggesting a degree of morphological continuity between the two regions.

However, the morphological analysis also revealed significant differences when comparing South Korean specimens to those from other European countries. The characters observed in Korea differed from variants reported in populations from Belgium, Italy, and other parts of Europe. This discrepancy suggests that the European populations are not morphologically uniform and that different regions may have been colonized by mosquitoes with distinct physical traits. The combination of genetic and morphological data points toward a complex invasion history rather than a simple, single-source introduction.

The authors conclude that the genetic and morphological differences observed between South Korean and several European populations of Aedes koreicus suggest that the European populations are unlikely to have originated solely from Korea. Instead, the findings indicate the possibility of additional source regions within the native range, outside of Korea, contributing to the establishment of the European populations. This implies that the invasion may have involved multiple introduction events from different parts of the species’ native distribution, including potentially northern China or the Russian Far East.

The researchers emphasize that their conclusions are based on the current dataset and that additional genetic data and broader sampling in both the native and invaded ranges are required for validation. While the study provides strong evidence against Korea being the sole source, it does not definitively identify all potential source regions. Future research involving more comprehensive sampling across the entire native range will be essential to fully resolve the complex history of this invasive species. The findings highlight the importance of considering multiple potential sources when managing invasive mosquito populations in new regions.

Subject of Research: Entomology

Article Title: Genetic diversity and morphology of South Korean Aedes koreicus (Diptera: Culicidae) provide insights into the origin of European populations

Article References: Lee, J., Lee, J., Lim, C., Kang, J. H., Seok, S., Lee, H. I., & Bae, Y. J. (2026). Genetic diversity and morphology of South Korean Aedes koreicus (Diptera: Culicidae) provide insights into the origin of European populations. Parasites & Vectors. https://doi.org/10.1186/s13071-026-07633-5

Image Credits: AI Generated

DOI: 10.1186/s13071-026-07633-5

Keywords: Aedes koreicus, Population Genetics, Invasive Species, Morphology, Mosquito Biology, Genetic, diversity, South, Korean, Aedes, koreicus, Diptera

Forensic entomology, the discipline that applies knowledge of insect taxonomy, biology, ecology and physiology to legal investigations, rests on three main pillars. The first is temperature-dependent development: insects grow at predictable rates that vary by species and population, so if investigators know the temperatures experienced by the earliest colonizers, they can estimate a minimum post-mortem interval, abbreviated minPMI, for relatively recent deaths. The second is the well-established pattern of colonization, in which different insect species arrive at a cadaver in a broadly predictable sequence, allowing estimates of longer post-mortem intervals based on the community of insects present on the remains. The third is habitat and phenology specificity, meaning that some species occupy particular environments or appear only in certain seasons, which can help determine the season of death in historical cases and even reveal whether a body was moved from one location to another after death.

Among the insects that matter most in this field, two orders dominate: the flies, or Diptera, which are typically the first to arrive, and the beetles, or Coleoptera, which follow later. Within the flies, families such as Calliphoridae, the blowflies, and Sarcophagidae, the flesh flies, have received enormous scientific attention because they are conspicuous, abundant and relatively well studied. Other families, including Muscidae, Fanniidae, Piophilidae and Phoridae, are consistently found on human and animal cadavers worldwide, yet some of their members remain poorly understood in terms of biology, distribution and habitat preferences. The genus Fannia, small dark flies measuring just three to four millimeters, belongs to this understudied group, and its taxonomy continues to challenge specialists even as its forensic relevance becomes increasingly clear.

The Fanniidae are a family of small to medium-sized flies with a worldwide distribution, once lumped together with the Muscidae and now recognized as a distinct family comprising more than 300 species across five genera. The genus Fannia alone contains around 400 described species, of which 80 are listed in Europe. Its larvae are saprophagous, feeding on decaying organic matter, and have been reported from birds’ nests, animal burrows, fungi and excrement. The flies also have medical significance because certain species can cause gastrointestinal, urogenital and traumatic myiasis, the infestation of living tissue. Roughly 20 to 25 Fannia species have been recorded from pig cadavers used in field experiments as human decomposition models, but only a handful, including Fannia canicularis, Fannia fuscula, Fannia leucosticta, Fannia manicata, Fannia monilis, Fannia nigra, Fannia pusio and Fannia scalaris, have ever been found on human remains in Europe. In Italy, only F. scalaris and F. canicularis had been commonly reported from human cadavers, always in the larval stage, until now.

The new case came to light when entomological samples were collected during the crime scene inspection following the discovery of a body in an abandoned building in southern Italy, with additional sampling performed during the post-mortem analysis. The body lay on the floor of a room with partially open windows and was in an advanced state of decomposition, partially mummified and partially skeletonized. Combining circumstantial evidence with entomological analysis, the investigators estimated that death had occurred seven to eight months before the body was found. The specimens were collected and processed according to established best-practice guidelines, observed and photographed with a stereomicroscope, preserved in 80 percent ethanol, and identified using the available literature alongside comparison with previously identified samples held in a reference collection.

What the team found was a remarkably complex insect community: sixteen taxa in total, spanning nine species of Diptera from the families Calliphoridae, Muscidae, Fanniidae, Sphaeroceridae and Phoridae, six species of Coleoptera from the families Dermestidae, Cleridae and Ptinidae, and one species of Lepidoptera from the family Tineidae, the clothes moths. Among the flies, only Hydrotaea capensis was present as larvae, while all the other fly taxa were represented by puparia, the hardened barrel-shaped casings that fly larvae form when they pupate, found both closed and open. The beetles, by contrast, appeared as both larvae and adults. Every taxon collected was already well known from Italian modern and archaeo-funerary cases and from field experiments with pigs and other animal models, with one striking exception: several puparia of Fannia lineata, a species that, based on an extensive literature search, had never before been recorded from a human cadaver.

The composition of the entomofauna allowed the researchers to estimate that colonization began in spring, a conclusion that agreed with the circumstantial evidence available in the case. Previous records of F. lineata fit this picture. According to the standard taxonomic literature on European Fanniidae, the species has been found in bird nests, in rabbit burrows and in vertebrate cadavers throughout Europe, though rarely. In Italy, an earlier study had collected the species from pig cadavers in an advanced state of decay, recovering an adult from an exposed pig carcass and larvae from a buried pig that was regularly exhumed to study how disturbance affects the colonization of buried bodies. The new human case is therefore consistent with the species’ apparent association with advanced decomposition, while dramatically extending its documented range of substrates.

Beyond the record itself, the study’s most valuable contribution may be morphological. Fannia larvae are characterized by a dorsoventrally flattened body armed with fleshy processes and by posterior spiracles raised on stalk-like processes in the anal region, but while the adults and larvae of European Fanniidae have been well described, puparia have remained poorly documented. This gap matters because puparia often represent the majority of fly findings in old cases and in archaeological contexts such as crypts and tombs, and because puparia can undergo physical alterations during pupariation, including contraction that partially obscures fine details, while features like oral sclerites are not consistently visible in empty puparia. The researchers therefore described the puparium of F. lineata in detail, noting a suite of diagnostic characters: the puparia are smaller than those of the two Fannia species previously known from Italian human cadavers; dorsolateral processes are absent; the six posterior processes are smooth and unbranched; the dorsomedian posterior processes are smaller than the others; a thickened arched area connects the two dorsal processes on the seventh abdominal segment; the posterior spiracles protrude less than in F. canicularis and F. scalaris; and the distance between the two posterior spiracles is twice the space between each spiracle and the lateral edge of the segment.

To make these characters usable in practice, the authors also provided an identification key for the larvae and puparia of the Fannia species collected from human cadavers in Italy, allowing forensic analysts to distinguish F. lineata from its more familiar congeners even when only puparial remains are available. The team emphasizes that the finding highlights the need for further research into the habitat preferences, phenology and developmental rate of F. lineata, a species that, despite being only occasionally encountered, may provide additional information useful for answering the questions posed by magistrates in forensic contexts. As climate change continues to shift both the phenology and the distribution of necrophagous insects, and as forensic entomology gains ground in courtrooms around the world at very different speeds depending on the country, discoveries like this one quietly expand the forensic toolkit. A fly barely four millimeters long, overlooked for more than a century since its description in 1895, has now formally joined the ranks of insects that can testify, silently and precisely, about the circumstances of human death.

Subject of Research: First forensic record of the fly Fannia lineata on a human cadaver and description of its puparium for species identification.

Article Title: Contributions to the identification of Fannia lineata (Stein, 1895) (Diptera: Fanniidae) in forensic contexts: first record in a human cadaver

Article References: Vanin, S., Carta, G., Scopetti, M., & Santurro, A. (2026). Contributions to the identification of Fannia lineata (Stein, 1895) (Diptera: Fanniidae) in forensic contexts: first record in a human cadaver. International Journal of Legal Medicine. https://doi.org/10.1007/s00414-026-03967-y

Image Credits: AI Generated

DOI: 10.1007/s00414-026-03967-y

Keywords: forensic entomology, Fannia lineata, Fanniidae, puparium identification, post-mortem interval, human decomposition, Southern Italy, Diptera, minimum PMI, insect succession, forensic science, identification key