The research, led by Bhushan K. Shigwan and colleagues at the Agharkar Research Institute in Pune, set out to answer a deceptively simple question: do different kinds of forest protection actually produce different kinds of forests? The team compared four distinct protection regimes across the Northern Western Ghats and the adjacent Konkan coastal belt—state-run Protected Areas such as national parks and wildlife sanctuaries, government-managed Reserved Forests, community-protected Sacred Groves, and privately owned forests that include coffee plantations and silvicultural holdings. While earlier studies had examined individual regimes in isolation, no comprehensive survey had systematically compared tree diversity, community structure, and species composition across all four within this region as an integrated landscape.

The scale of the effort was considerable. Between 2017 and 2021, the researchers laid out forty transects—ten in each protection regime—stretching across an elevational range from 26 to 1,411 meters above sea level and a latitudinal span of nearly five degrees. Each transect ran 140 meters and contained four quadrats of 20 by 20 meters, spaced with 20-meter gaps to reduce spatial autocorrelation. Within every quadrat, the team measured all woody individuals with a girth at breast height of at least 30 centimeters, recording species identity, abundance, and trunk dimensions. Field identifications were verified against herbarium specimens at the Agharkar Herbarium of Maharashtra Association, and sampling was deliberately timed between December and May to avoid the monsoon, minimize phenological bias, and comply with access restrictions during wildlife breeding periods.

To quantify human pressure, the researchers scored eight categories of disturbance at each site—cutting, lopping, fire, grazing, construction, internal pathways, other human activities such as festivals and tourism, and proximity to roads—on an ordinal scale from zero to five. These scores were aggregated into a Combined Disturbance Index, a single number capturing the overall anthropogenic footprint of each forest. The results were striking. Sacred Groves recorded the highest average disturbance score at 47.75, followed by private forests at 34.5 and Reserved Forests at 31.5, while Protected Areas enjoyed the lowest at 17.5. The differences were statistically significant, confirming that the four regimes genuinely represent a gradient of human impact rather than merely different labels on similar land.

In total, the team recorded 3,360 woody plants representing 148 species, 118 genera, and 43 families. Reserved Forests emerged as the diversity champions, with the highest number of species at 89, along with the greatest richness of evergreen and endemic species. Protected Areas followed closely, while Sacred Groves matched Protected Areas in species count. Private forests told a different story: they hosted the highest richness and abundance of deciduous species and the lowest representation of evergreens, painting a picture of communities shifted toward disturbance-tolerant, drought-deciduous taxa. Shannon diversity values ranged from 1.13 to 2.98 across sites, and permutation-based analysis of variance revealed significant differences in species richness among regimes, though post-hoc tests suggested these arose from modest but consistent shifts rather than any single dramatic contrast.

Perhaps the most technically revealing results came from the structural analysis. Tree density differed strongly among regimes, with Reserved Forests and Protected Areas supporting the highest stem counts, dominated by individuals in the smallest girth class of 30 to 60 centimeters—a signature of active regeneration and younger, recovering stands. Sacred Groves, by contrast, showed lower densities but the highest mean basal area at 42.33 square meters per hectare, significantly exceeding both private forests and Reserved Forests. In the largest girth classes, above 150 centimeters, Sacred Groves held significantly more trees than any other regime. These giants, some potentially centuries old, represent legacy biomass that younger forests cannot replicate, and they position sacred groves as critical reservoirs of carbon and structural complexity in a fragmented landscape.

Community composition told a subtler story. Non-metric multidimensional scaling of site-level abundances showed that most sampling sites from Protected Areas, Sacred Groves, and Reserved Forests clustered tightly together, indicating broad overlap in species assemblages. Cluster analysis identified two main groupings—Sacred Groves with Protected Areas, and private forests with Reserved Forests—with overall similarity between regimes hovering around 38 percent, and roughly 50 to 54 percent within the paired groups. Only 26 species were shared across all four regimes, while each harbored 11 to 20 unique species. An analysis of similarities confirmed that compositional differences among regimes were weak and statistically non-significant, suggesting that chronic disturbance reshapes forest structure and functional traits without necessarily causing wholesale turnover in which species are present.

One species stood out as the great connector of these fragmented worlds. Memecylon umbellatum, a shade-intolerant, early-successional tree dispersed by birds and mammals, ranked among the dominant species in every protection regime, contributing disproportionately to total abundance everywhere the team looked. Its ubiquity likely reflects both its tolerance of canopy disturbance and the persistence of animal dispersal vectors across the landscape. Seed dispersal analysis added another layer: autochorous, self-dispersing species were significantly more common in private and Reserved Forests, where disturbed microhabitats favor them, while zoochorous, animal-dispersed species—typical of evergreen forests—remained well represented across all regimes, hinting that ecological relationships between trees and their dispersers persist even in degraded stands.

The conservation implications are profound. The authors argue that no single protection regime can represent the full biodiversity and structural value of the Northern Western Ghats; instead, the region’s ecological integrity rests on the complementarity of its management mosaic. Sacred Groves, sustained for generations by socio-cultural norms rather than enforcement, act as refugia for mature trees and endemic species, yet they are increasingly threatened by urbanization and the erosion of traditional practices, with significant losses reported over the past five decades. Protected Areas and Reserved Forests, meanwhile, are the engines of regeneration, teeming with young stems that promise future canopy. Private forests, though the most degraded, offer the greatest restoration opportunity: reintroducing evergreen and endemic species at lower elevations could recover biomass, carbon storage, and habitat connectivity.

For a biodiversity hotspot where primary forest loss and human pressure continue to mount, the message is clear and urgent. Formal legal protection matters—it suppresses disturbance and nurtures the next generation of forest. But cultural protection matters too, in ways that law cannot replicate, preserving the ancient giants that anchor forest ecosystems. The researchers call for regime-specific conservation strategies that pair disturbance regulation and restoration in private and community forests with renewed support for the community stewardship that keeps sacred groves standing. In the Northern Western Ghats, saving biodiversity will require not one fortress of conservation, but an entire alliance of them—legal, cultural, and private—each playing an irreplaceable role in sustaining the forest of the future.

Subject of Research: Comparative assessment of tree diversity and forest structure across four protection regimes in the Northern Western Ghats, India

Article Title: Assessing the impact of differential protection regimes on tree diversity and composition in the Western Ghats: insights for conservation strategies

Article References: Shigwan, B. K., Kulkarni, A., Smirthy, V., Page, N. V., Shetti, R., & Datar, M. N. (2026). Assessing the impact of differential protection regimes on tree diversity and composition in the Western Ghats: insights for conservation strategies. Discover Ecology, 2(1), Article 2. https://doi.org/10.1007/s44396-025-00016-7

Image Credits: AI Generated

DOI: 10.1007/s44396-025-00016-7

Keywords: Western Ghats, sacred groves, tree diversity, forest conservation, protected areas, basal area, endemic species, anthropogenic disturbance, seed dispersal, biodiversity hotspot, community conservation, forest structure

The research, led by Flávia dos Santos Bomfim, Luisa Maria Diele-Viegas and colleagues at the Federal University of Bahia and partner institutions, set out to quantify how three global change drivers interact to shape the future of this critically endangered cactus. The species is officially listed as Critically Endangered in Brazil and as Vulnerable on the IUCN Red List, and its known range is tightly constrained to three ecoregions of the Caatinga: the Southern Sertaneja Depression, the Chapada Diamantina Complex and the São Francisco Dunes. Because M. pachyacanthus is a narrow endemic, confirmed occurrence records are scarce; only 33 records were available from biodiversity databases, and after filtering for spatial errors and duplicates, just 18 high-quality points remained for modeling. For most ecological niche modeling approaches, that number would be crippling. The team turned instead to a framework designed precisely for data-poor species.

The method, known as Ensembles of Small Models, or ESMs, sidesteps the overfitting problems that plague conventional species distribution models when sample sizes are tiny. Rather than fitting one complex model with many predictors at once, the approach builds a suite of simple bivariate models, each pairing the species’ occurrences with just one or two environmental variables, and then combines them into a weighted consensus. The researchers implemented this framework in the R environment using the flexsdm package, drawing on four algorithms: generalized linear models, generalized additive models, maximum entropy, and support vector machines. Each algorithm was run through ten replications of repeated three-fold cross-validation, with a 1:1 prevalence ratio of pseudo-absences for most algorithms and a large background sample for maximum entropy. A sensitivity analysis confirmed that both sampling strategies produced virtually identical spatial projections, with a Pearson correlation of roughly 0.91 between the two sets of outputs.

Environmental predictors were drawn from the WorldClim v2.1 database at a resolution of approximately five by five kilometers. The team deliberately excluded four bioclimatic variables, BIO8, BIO9, BIO18 and BIO19, because these combined temperature-precipitation metrics are known to generate mathematical artifacts and unrealistic spatial discontinuities in northeastern Brazil. After screening for collinearity with a Pearson correlation threshold of 0.7, four ecologically meaningful variables survived: temperature seasonality, mean temperature of the warmest quarter, annual precipitation, and precipitation seasonality. Together these capture the dimensions of water availability and thermal stress that govern life in a seasonally dry tropical forest. Model performance was rigorously assessed with four complementary metrics: the area under the receiver operating characteristic curve, the true skill statistic, the Sørensen similarity index, and the continuous Boyce index. Cross-validated AUC values for the individual algorithms ranged from 0.81 to 0.83, comfortably above the 0.75 threshold the team set for retaining high-performing replicates, and the final weighted consensus achieved an in-sample AUC of 0.93.

The baseline map of current suitability tells a clear story. The model predicted roughly 133,327 square kilometers of climatically suitable habitat across the three ecoregions, with the overwhelming majority, about 109,066 square kilometers, concentrated in the Southern Sertaneja Depression. The Chapada Diamantina Complex held smaller pockets of suitability, while the São Francisco Dunes, where the species has never been confirmed, showed only about 580 square kilometers of marginal habitat. This concentration aligns with what field biologists know about the cactus: populations in the Southern Sertaneja Depression, where conditions best match the species’ physiological requirements, are likely the ones with the greatest long-term persistence. Populations in the Chapada Diamantina, which sits at lower macroclimatic suitability, may owe their survival to localized microclimates created by the region’s rugged topography, conditions that coarse-resolution climate layers cannot fully resolve.

It is the future projections that should alarm conservationists. Under the intermediate emissions scenario, SSP2-4.5, the model projects a 51.26 percent loss of suitable habitat by mid-century. Under the high-emissions scenario, SSP5-8.5, the loss climbs to 69.50 percent. The ecoregional breakdown is even more sobering. In the Southern Sertaneja Depression, the species’ stronghold, suitability contracts by 53.49 percent under the intermediate scenario and 72.13 percent under the high-emission one. The Chapada Diamantina Complex loses 40.06 percent and 57.27 percent respectively, while the São Francisco Dunes all but vanishes from the map, shedding 87.58 percent of its suitable area under the intermediate scenario. A multivariate environmental similarity analysis confirmed that novel, non-analog climates remain largely confined to peripheral transition zones, while inter-model variance across three CMIP6 global circulation models showed high consensus in the core range, meaning the projected collapse is not an artifact of disagreement among climate models.

Yet the study’s most striking finding concerns the present, not the future. When the team overlaid their suitability maps with land-use and land-cover data from the MapBiomas project and with cumulative fire records spanning 1985 to 2022, they discovered that human landscape transformation has already erased a comparable share of habitat. Anthropogenic land-use conversion overlapped with 40.48 percent of the species’ suitable area as early as 1995, rising to 43.20 percent by 2022. Cumulative fire, by contrast, affected a smaller but growing fraction, from 2.84 percent in 1995 to 5.70 percent in 2022. Combined, the two disturbances had removed 44.57 percent of potential habitat by 2022, a figure approaching the 51.26 percent loss that the intermediate climate scenario projects for 2050. In other words, nearly three decades of deforestation, ranching and burning have already inflicted damage on a scale that climatologists expect from a quarter century more of global warming.

The regional patterns vary in instructive ways. The Southern Sertaneja Depression, with its vast extent and long history of conversion to cattle pasture and agriculture, suffered the largest absolute habitat losses, reaching 46.70 percent combined loss in 2022. The São Francisco Dunes, an environmentally marginal region for the cactus with only a small baseline of suitable habitat, showed the highest relative vulnerability, including a pronounced spike in 2015 when land-use overlap reached 58.72 percent before a modest apparent recovery by 2022. The researchers caution that this recovery likely reflects localized agricultural abandonment and secondary succession of Caatinga vegetation rather than genuine ecological restoration, and that minor fluctuations in land-use classification can translate into large percentage shifts in a region where the species occupies so little ground to begin with. Fire, while less extensive, degrades soil nutrition and vegetation structure in ways that compound the stress on a slow-growing species whose seedlings are acutely sensitive to rising temperatures and habitat degradation.

The implications reach well beyond a single cactus. Cacti as a family are increasingly recognized as one of the world’s most threatened plant lineages, with nearly a third of evaluated species already listed as threatened and most projected to lose range under ongoing climate and land-use change. The fate of M. pachyacanthus offers a template for how those pressures converge on range-restricted endemics in dryland ecosystems worldwide. The authors argue that the ESM framework, by extracting reliable predictions from sparse data, provides a robust tool for identifying priority conservation areas even for the rarest species. Their concrete recommendations follow directly from the maps: restoring degraded areas that remain climatically suitable, and establishing strictly protected areas of integral protection within core refugia where suitability decline is consistently predicted across all climate models. Because projections of novel climate and high uncertainty are confined to peripheral zones, planners can act with confidence in the core of the species’ range.

The study also acknowledges its limits. Eighteen occurrence records, however carefully curated, cannot capture the full complexity of biotic interactions, from the hummingbirds and lizards that pollinate and disperse the cactus to the specialist ecological networks that sustain it. Fine-scale microclimatic refugia in the Chapada Diamantina’s deep valleys may harbor populations that the five-kilometer climate grid smooths away. Still, the authors emphasize that waiting for perfect data is a luxury that critically endangered species cannot afford, and that even preliminary predictive models can guide urgent surveys and protection. For Melocactus pachyacanthus, the message of the modeling is unambiguous: the window for proactive land-use policy is closing, and the choices Brazil makes about its semi-arid landscapes in the coming decade will determine whether this spiny sentinel of the Caatinga persists or becomes another casualty of a rapidly changing world.

Subject of Research: Climate and land-use change impacts on the endangered Caatinga endemic cactus Melocactus pachyacanthus

Article Title: Predicting the future of the Caatinga endemic Melocactus pachyacanthus under climate and anthropogenic landscape changes

Article References: Santos Bomfim, F. D., Diele-Viegas, L. M., Almeida, T. S., Zaballa, B. B., dos Santos, M. A., Andrade, H., & Melo Gomes, F. (2026). Predicting the future of the Caatinga endemic Melocactus pachyacanthus under climate and anthropogenic landscape changes. Discover Ecology, 2(1), Article 25. https://doi.org/10.1007/s44396-026-00042-z

Image Credits: AI Generated

DOI: 10.1007/s44396-026-00042-z

Keywords: Melocactus pachyacanthus, Caatinga, climate change, cactus conservation, ecological niche modeling, Ensembles of Small Models, land use change, fire, Bahia, endemic species, biodiversity, habitat loss

The carrot family is a botanical superstar in more ways than one. Beyond the carrot itself, Apiaceae includes celery, parsley, fennel, cumin, coriander, and dill, along with a wealth of aromatic and medicinal species rich in secondary metabolites. The subfamily Apioideae, in particular, dominates the family in species richness and economic importance. Iran sits at a global hotspot for this group, hosting hundreds of species across genera such as Ferula, Prangos, Bunium, Elwendia, and Zeravschania, many of them endemic to the Iranian plateau and neighboring regions of Southwest Asia. Yet despite decades of botanical exploration, the chromosomal architecture of many Iranian taxa remained poorly documented, leaving a substantial gap in the cytotaxonomic record.

Chromosome numbers and karyotype characteristics have long served as powerful tools in plant taxonomy. Because chromosome complements tend to be stable within species and often conserved within related groups, they can help confirm species boundaries, reveal hybrid origins, expose polyploid lineages, and inform hypotheses about evolutionary relationships. In the new study, researchers applied standard cytogenetic techniques to mitotic metaphase spreads prepared from germinating seeds and root tips collected across Iranian populations. From these preparations, they counted chromosomes, constructed karyotype formulas describing the position of centromeres on each chromosome pair, and built idiograms, the schematic diagrams that visualize chromosome size and morphology. They also calculated a suite of karyotype asymmetry indices, quantitative measures that reflect how unequally sized the chromosomes are within a complement and how far the centromeres sit from the median position, both of which are considered signals of evolutionary specialization.

The headline findings concern five species whose chromosome counts are reported here for the first time. Ferula cupularis was found to carry 2n = 18 chromosomes, Prangos acaulis 2n = 20, Prangos calligonoides 2n = 22, Prangos crossoptera 2n = 44, and Zeravschania aucheri 2n = 30. Each of these counts fills a blank space on the cytotaxonomic map, and several carry immediate evolutionary interest. The contrast between the diploid counts of Prangos acaulis and Prangos calligonoides on one hand and the tetraploid count of Prangos crossoptera on the other highlights the role of whole-genome duplication in shaping diversity within a single genus. Polyploidy, the possession of more than two complete chromosome sets, is one of the most important drivers of plant diversification, often enabling rapid speciation, ecological expansion, and shifts in morphology and physiology.

Equally intriguing are the discrepancies between the new counts and previously published numbers. The study recorded chromosome numbers differing from earlier reports in several taxa, including Elwendia persica, Ferula assa-foetida, Ferula flabelliloba, Ferula stenocarpa, and Anisotaenia subvelutina. Such mismatches can arise for several reasons: misidentification of material in earlier studies, true intraspecific variation in which different populations carry different cytotypes, or even aneuploid changes involving the gain or loss of individual chromosomes. Asafoetida, Ferula assa-foetida, is Iran’s most famous medicinal resin plant, and intraspecific karyomorphological and genome size variation has previously been documented in Iranian accessions of the species. The revised count adds to a growing picture of Ferula as a genus in which chromosomal evolution has been particularly dynamic.

Across the full sample, chromosome numbers ranged from 2n = 10 to 2n = 44, an impressive spread that underscores the karyological breadth of Iranian Apioideae. Within that range, the researchers documented interspecific variation in karyotype formulas, asymmetry indices, and ploidy levels. Several distinct cytotypes were identified, meaning that some taxa exist in multiple chromosomal races, a phenomenon that can complicate species delimitation but also offers a window into ongoing speciation. Cytotype diversity is increasingly recognized as a hidden engine of plant evolution: populations with different ploidy levels are often reproductively isolated from one another, and chromosome rearrangements such as fusions and fissions can suppress recombination and promote local adaptation, effectively sealing off lineages genetically even before morphological differences become obvious.

Karyotype asymmetry adds another analytical layer. Under classical ideas of chromosomal evolution proposed by G. Ledyard Stebbins, more symmetric karyotypes, with chromosomes of similar size and metacentric or submetacentric centromere positions, are generally considered ancestral, while increasing asymmetry is interpreted as a derived, specialized state. The new study outlines variation in karyotype symmetry among the examined Iranian groups, providing baseline data that can be compared with molecular phylogenies to test whether karyological trends track lineage divergence. Recent higher-level nuclear phylogenomic work on the carrot family, together with updated lineage-based tribal classifications with special focus on Iranian genera, now offers exactly the evolutionary framework into which these cytological data can be mapped. Chromosome counts thus become not merely descriptive records but characters that can be interpreted in a phylogenetic context.

The practical value of the dataset extends beyond pure systematics. Baseline cytogenetic information is essential for breeding programs, germplasm conservation, and biodiversity assessment. Many Iranian Apioideae are economically or medicinally important, from cumin and ajwain relatives to the resin-producing Ferula species prized since antiquity. Knowing the ploidy level and karyotype structure of wild relatives guides breeders in making compatible crosses and informs ex situ conservation strategies, since cytotypes often warrant separate collection and management. For endemic species with narrow ranges, chromosome data also help prioritize populations that represent unique evolutionary lineages. As the authors note, the findings provide baseline cytogenetic data for taxonomic and comparative studies and contribute to the understanding of chromosomal diversity in Southwest Asian Apiaceae more broadly.

The research also fits into a larger renaissance in plant cytotaxonomy. Modern cytogenetics increasingly combines classical chromosome counting with molecular cytogenetic landmarks, genome size estimation, and phylogenomics, allowing researchers to trace how karyotypes have been reshaped over millions of years. In Apiaceae, model systems such as carrot have yielded centromeric repeat markers and detailed karyotype analyses that now serve as reference points for the wider family. Studies like this one on Iranian Apioideae extend that toolkit into a biodiversity hotspot, ensuring that the remarkable chromosomal variety of the region’s umbellifers is documented before habitat loss and climate change further compress their ranges.

For now, the study stands as a milestone for Iranian botanical cytogenetics and a call to action for broader sampling. With five species cytologically characterized for the first time, several counts corrected or revised, and a rich catalog of karyotype features assembled across sixteen genera, the work demonstrates how much hidden diversity remains encoded in the chromosomes of even familiar plant families. As comparative datasets grow, the chromosome complement, that most fundamental of biological archives, will continue to illuminate the evolutionary stories written into Iran’s fields, slopes, and steppes, one metaphase spread at a time.

The analytical conventions underpinning the study have deep roots in cytological practice. Centromere positions were classified according to the long-standing nomenclature introduced by Levan and colleagues in 1964, which remains the standard vocabulary for describing chromosomes as metacentric, submetacentric, acrocentric, or telocentric. Asymmetry indices likewise draw on a rich methodological literature, including formulations refined by later workers who criticized earlier measures for conflating chromosome size differences with centromere displacement. By applying these quantitative tools consistently across all sixteen genera, the authors produced values that are directly comparable both within the sample and with published karyological data from other regions, an important consideration given how sensitive asymmetry statistics can be to measurement choices.

Iran has a surprisingly long tradition of chromosome documentation for its flora. National inventories of plant chromosome numbers compiled in Tehran have accumulated counts over decades, and regional studies from neighboring countries such as Jordan, Turkey, and Afghanistan provide comparative context for the Iranian material. Much of the early cytological work on Umbelliferae dates to the classical surveys of the mid-twentieth century, when chromosome counting was among the few characters available for testing morphological classifications. The new counts therefore join a historical archive, and the discrepancies they reveal with older reports illustrate how revisiting a group with fresh material from documented wild populations can refine a record built partly on cultivated or poorly localized specimens.

The subfamily’s cytological literature also records curiosities beyond standard complements, such as supernumerary B-chromosomes reported in ajwain, Trachyspermum ammi, a reminder that chromosome counts alone can understate the full genomic variation within a lineage. Databases dedicated to Southwest Asian Umbelliferae biodiversity have long emphasized the need for cytological coverage of the region’s genera, and the present dataset responds directly to that gap. Because many Iranian Apioideae occupy mountainous or arid habitats where populations are fragmented, cytotype differences among populations may reflect historical isolation during climatic fluctuations of the Pleistocene, a hypothesis that future paired sampling of chromosomes and molecular markers could test. In the meantime, the idiograms and karyotype formulas published here give researchers a concrete reference for identifying material in breeding lines, herbarium-backed studies, and conservation assessments alike.

Subject of Research: Chromosome numbers and karyotype diversity in Iranian Apioideae (Apiaceae) and their cytotaxonomic implications

Article Title: New insights into chromosome counts and karyotype diversity in Iranian Apioideae (Apiaceae): cytotaxonomic implications

Article References: Khazaei, Z., Bagheri, A., Lyskov, D., Harpke, D., & Blattner, F. R. (2026). New insights into chromosome counts and karyotype diversity in Iranian Apioideae (Apiaceae): cytotaxonomic implications. Plant Biosystems, 160(5), Article 263. https://doi.org/10.1007/s44473-026-00253-y

Image Credits: AI Generated

DOI: 10.1007/s44473-026-00253-y

Keywords: cytotaxonomy, chromosome counts, karyotype asymmetry, polyploidy, cytotype diversity, Apioideae, Apiaceae, Umbelliferae, Iran, endemic species, speciation, Ferula