{"title":"Correction to “A Modern Ghost Story: Increased Selective Mortality of Salmon Under Climate Extremes”","authors":"","doi":"10.1111/gcb.71080","DOIUrl":"https://doi.org/10.1111/gcb.71080","url":null,"abstract":"","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"15 1","pages":""},"PeriodicalIF":11.6,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148877340","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuyan Gong, Han Zhang, Guanqiong Ye, Jiangning Zeng, Xiaojun Yan
{"title":"Mapping the Global Habitat Redistribution of Critically Endangered Commercial Fish Species Under Climate Change","authors":"Yuyan Gong, Han Zhang, Guanqiong Ye, Jiangning Zeng, Xiaojun Yan","doi":"10.1111/gcb.71077","DOIUrl":"https://doi.org/10.1111/gcb.71077","url":null,"abstract":"Climate change is reshaping marine fish habitats. Yet the future habitats' redistribution of fishes that are both critically endangered (CR) and globally commercially exploited remains poorly understood. Here, we assessed current and future suitable habitats for 24 CR commercial coastal demersal fishes selected on the IUCN Red List. Using ensemble species distribution models (SDMs), we projected habitat suitability under SSP1‐2.6 and SSP5‐8.5 by the 2100 s, and combined the projections with exclusive economic zones (EEZs), marine protected areas (MPAs), and fishing pressure. Most species were projected to experience net habitat contraction by the 2100 s, with stronger losses under SSP5‐8.5 and pronounced declines in tropical and subtropical coastal waters. Across 145 coastal EEZs, projected species richness showed marked spatial heterogeneity, with Asia retaining the highest mean richness and Europe showing a net increase. Low‐income and lower‐middle‐income countries supported substantial current species richness but faced stronger relative declines under SSP5‐8.5. Projected habitats of CR commercial fishes intersected MPAs in only 49% of coastal countries, indicating substantial protection gaps. Overall, this study quantitatively delineates climate‐driven habitat redistribution patterns of CR commercial fishes, suggesting potential implications for optimizing MPAs networks and advancing transboundary conservation strategies to promote marine biodiversity and sustainable fisheries development.","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"03 1","pages":""},"PeriodicalIF":11.6,"publicationDate":"2026-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148877332","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Guilherme Costa Alvarenga, Caroline C Sartor, Ana Carolina Srbek-Araujo, Ana Cristina Mendes-Oliveira, Bart Harmsen, Carlos De Angelo, Carolina Franco Esteves, Claudia Bueno de Campos, Daiana Jeronimo Polli, Diego F Passos Viana, Diogo Maia Gräbin, Emiliano Donadio, Emiliano E Ramalho, Esteban Payán, Fernando C C Azevedo, Francisco Palomares, George V N Powell, Gerardo Ceballos, Grasiela Porfirio, Heliot Zarza, Ivonne Cassaigne, Juliano A Bogoni, Leonardo Sena, Louise Maranhão, Marcos Roberto Monteiro de Brito, Mathias W Tobler, Øystein Wiig, Rafael Antelo, Rebecca J Foster, Ricardo Sampaio, Robin Naidoo, Rodrigo Nuñez, Ronaldo G Morato, Sandra Petrone Mendoza, Valeria Boron, Wener Hugo Arruda Moreno, David W Macdonald, Żaneta Kaszta, Samuel A Cushman
{"title":"Jaguar Range-Wide Connectivity: Prioritising Core Areas and Corridors Between and Within Protected Areas and Indigenous Lands.","authors":"Guilherme Costa Alvarenga, Caroline C Sartor, Ana Carolina Srbek-Araujo, Ana Cristina Mendes-Oliveira, Bart Harmsen, Carlos De Angelo, Carolina Franco Esteves, Claudia Bueno de Campos, Daiana Jeronimo Polli, Diego F Passos Viana, Diogo Maia Gräbin, Emiliano Donadio, Emiliano E Ramalho, Esteban Payán, Fernando C C Azevedo, Francisco Palomares, George V N Powell, Gerardo Ceballos, Grasiela Porfirio, Heliot Zarza, Ivonne Cassaigne, Juliano A Bogoni, Leonardo Sena, Louise Maranhão, Marcos Roberto Monteiro de Brito, Mathias W Tobler, Øystein Wiig, Rafael Antelo, Rebecca J Foster, Ricardo Sampaio, Robin Naidoo, Rodrigo Nuñez, Ronaldo G Morato, Sandra Petrone Mendoza, Valeria Boron, Wener Hugo Arruda Moreno, David W Macdonald, Żaneta Kaszta, Samuel A Cushman","doi":"10.1111/gcb.71093","DOIUrl":"https://doi.org/10.1111/gcb.71093","url":null,"abstract":"<p><p>Anthropogenic habitat transformation has led to population declines and increasing isolation of populations of many species, particularly top predators, where small and fragmented populations often experience limited dispersal and reduced genetic diversity. Jaguars (Panthera onca), for example, have lost half of their historical range and most populations outside the Amazon biome are small, isolated and highly threatened. Here, we assess jaguar population connectivity across the species' range by identifying and ranking core areas and dispersal corridors, including linkages among Protected Areas and Indigenous Lands (hereafter, PAs). We used cumulative resistant kernels and factorial Least-Cost Paths (fLCP) in two complementary approaches: core area-based and PA-based connectivity. We identified 307 core areas for jaguar movement, covering ~7.75 million km<sup>2</sup> (55% of the current range), of which approximately half lies within PAs. The largest and highest-ranked core area spans ~6.5 million km<sup>2</sup> across four biomes (Amazon, Llanos, Chaco and Pantanal). We identified 176 dispersal corridors connecting core areas, although connectivity was not continuous across the entire range. Northern populations (Mexico and Central America) showed several connectivity gaps, whereas South America displayed a large, highly interconnected network linking the Amazon, Llanos, Chaco, Pantanal, Cerrado, Caatinga, Iberá and the Atlantic Forest's Green Corridor. In contrast, coastal Atlantic Forest patches appeared largely isolated. The PA-based analysis predicted 507 potential corridors connecting 905 PAs, including potential links absent from the core area model, particularly across Central America and between the Darién Gap, Amazon and coastal Atlantic Forest. The core-area approach provides a more biologically realistic representation of current connectivity, while the PA-based approach complements it by identifying pragmatic opportunities for long-term connectivity conservation. Together, these approaches identify priority areas and regions of uncertainty, providing a spatial framework to guide jaguar conservation and connectivity planning under accelerating global change.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"32 9","pages":"e71093"},"PeriodicalIF":12.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148890488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chenhao Lyu, Jieyu Gao, Peng Chen, Xinxin Jing, Luping Ye, Zhiguo Li, Wenzhi Liu, Yi Liu
{"title":"Ecosystem‐Dependent Responses of Microbial Necromass Carbon to Warming Are Governed by the Balance Between Necromass Formation and Decomposition","authors":"Chenhao Lyu, Jieyu Gao, Peng Chen, Xinxin Jing, Luping Ye, Zhiguo Li, Wenzhi Liu, Yi Liu","doi":"10.1111/gcb.71085","DOIUrl":"https://doi.org/10.1111/gcb.71085","url":null,"abstract":"Microbial necromass carbon (MNC) is increasingly recognized as a major contributor to persistent soil organic carbon (SOC), yet its response to climate warming and the underlying regulatory mechanisms remain poorly understood. Here, we conducted a global meta‐analysis to assess how total MNC, fungal necromass carbon (FNC), and bacterial necromass carbon (BNC) respond to warming and to identify the key drivers. Overall, warming had no significant net effect on total MNC, FNC, or BNC across all observations, although publication bias‐corrected analyses revealed a significant 8.6% increase in FNC. However, warming effects varied substantially among ecosystems, increasing MNC accumulation in permafrost (+25.4%), grassland (+8.2%), and cropland (+9.9%) soils, while decreasing it in forests (−12.4%) and showing no significant effect in wetlands. Warming effects were further influenced by warming method, soil depth, climatic conditions, and initial soil properties. Meta‐regression analyses showed that warming‐induced changes in microbial biomass were the strongest predictor of MNC responses, highlighting the central role of microbial growth and turnover in regulating necromass dynamics. Moreover, shifts in nutrient availability, soil pH, and extracellular enzyme activities significantly influenced the balance between necromass production and decomposition. Positive coupling between MNC and SOC responses suggests that microbial necromass formation represents an important mechanism linking microbial processes to soil carbon persistence under warming. Overall, our findings demonstrate that warming affects MNC by altering microbial traits and nutrient availability, thereby regulating the balance between necromass production and decomposition. Ecosystem‐specific conditions further determine the magnitude and direction of these responses. These findings highlight the need to incorporate microbial necromass dynamics into predictions of soil carbon‐climate feedbacks under future warming scenarios.","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"21 1","pages":""},"PeriodicalIF":11.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148860890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lucas Barros-Rosa, Pierre Girard, Priscila Lemes de Azevedo Silva, Fabio de Oliveira Roque, Mark Johnson, Christine Strüssmann, Thadeu Sobral de Souza, Renata Libonati, Liana O Anderson, Cátia Nunes da Cunha, Geraldo Alves Damasceno-Júnior, Walfrido Moraes Tomas, Lúcia Mateus, Fernando A da Costa Fernandes, Daniela de Oliveira Maionchi, Junior Gonçalves da Silva, Higo J Dalmagro, Jerry Penha
{"title":"Climatic and Hydrological Changes Drive Contemporary Fire Regime Transitions in the World's Largest Wetland.","authors":"Lucas Barros-Rosa, Pierre Girard, Priscila Lemes de Azevedo Silva, Fabio de Oliveira Roque, Mark Johnson, Christine Strüssmann, Thadeu Sobral de Souza, Renata Libonati, Liana O Anderson, Cátia Nunes da Cunha, Geraldo Alves Damasceno-Júnior, Walfrido Moraes Tomas, Lúcia Mateus, Fernando A da Costa Fernandes, Daniela de Oliveira Maionchi, Junior Gonçalves da Silva, Higo J Dalmagro, Jerry Penha","doi":"10.1111/gcb.71089","DOIUrl":"https://doi.org/10.1111/gcb.71089","url":null,"abstract":"<p><p>Tropical wetlands have historically been resilient to fire, but ongoing climate and hydrological changes are undermining this stability. Here, we provide robust multi-decadal evidence (1985-2024) of structural changes in the contemporary fire regime of the Pantanal, the world's largest wetland, associated with hydroclimatic disruption. We investigated changes in burned area, mean fire size, and fire seasonality using hydrological, climatic, and fuel-condition predictors. To identify the major drivers of fire dynamics, we applied trend analyses and Elastic Net models across multiple temporal and spatial scales. Although no significant monotonic trend was detected for annual burned area across the entire time series, change point analysis identified 2014 as the onset of a significant upward trend. Mean fire size exhibited a significant long-term upward trend across the full period, which intensified after 2018, suggesting larger fire sizes in recent years. Across models, reduced precipitation, shorter seasonal wetland flood pulses, and higher atmospheric and fuel dryness emerged as the strongest predictors of burned area and fire size. These changes have expanded the duration of the fire season, particularly in the northern and central Pantanal, by delaying the onset of rains and shortening the flood pulse period. Our findings suggest a weakening of the hydroclimatic coupling that has regulated ignition and fuel availability in the Pantanal. Broader environmental changes in the upper basin and regional climate may be reinforcing this transition. These results highlight the Pantanal's increasing vulnerability to drought-driven fires and underscore the urgent need for integrated water and fire management strategies to preserve the resilience of the Pantanal and other tropical wetlands under intensifying global change pressures.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"32 9","pages":"e71089"},"PeriodicalIF":12.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148890609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pedro Paulo Souza-Lopes, Thibault Datry, Carla Ferreira Rezende, Andros T Gianuca
{"title":"Scale-Dependent Biodiversity Responses to Drying and Land Use in River Metacommunities Facing Global Change.","authors":"Pedro Paulo Souza-Lopes, Thibault Datry, Carla Ferreira Rezende, Andros T Gianuca","doi":"10.1111/gcb.71094","DOIUrl":"https://doi.org/10.1111/gcb.71094","url":null,"abstract":"<p><p>Global change is increasing river drying and transforming surrounding landscapes through human land use, with important consequences for freshwater biodiversity. Yet how river drying and land use jointly influence biodiversity across spatial scales remains poorly understood. Using macroinvertebrate data from 49 riverine metacommunities in southeastern France, we examined how river drying and land use affect biodiversity across spatial scales and the metacommunity properties underlying these patterns. We estimated species-area relationship (SAR), with intercept and slope of SAR curve representing patterns analogous to alpha- and beta-diversity, respectively, and fitted structural equation models to assess how flow intermittence, land use (% of non-natural surface), and network size affected the metacommunity properties underlying these patterns, including intraspecific aggregation, species abundance distribution, total abundance, and regional species pool. Flow intermittence increased intraspecific aggregation and reduced evenness, leading to a lower SAR intercept and a steeper slope, reflecting lower local diversity but greater compositional differentiation among non-perennial rivers, and revealing strong scale-dependent responses of biodiversity to drying. Trait analyses further showed that flow intermittence favored aerial passive dispersers while reducing the relative abundance of aquatic active dispersers, suggesting that altered dispersal dynamics in non-perennial river networks contribute to biodiversity organization. In addition, land use primarily influenced biodiversity through nonlinear effects on the metacommunity species pool, with intermediate levels of land use associated with the highest regional diversity. Moreover, land use weakened the positive effect of flow intermittence on aggregation, indicating that anthropogenic pressures can homogenize metacommunities in drying regimes. Our findings demonstrate that flow intermittence strongly influences biodiversity across spatial scales through different mechanisms rather than uniformly reducing it. As climate change is forecast to increase the proportion of non-perennial rivers worldwide, our results highlight the importance of incorporating metacommunity processes and multi-scale diversity patterns into the conservation and management of these ecosystems.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"32 9","pages":"e71094"},"PeriodicalIF":12.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148890454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Armando J Cruz-Laufer, Farid Dahdouh-Guebas, Dakeishla M Díaz-Morales, Olexiy Kyrychenko, Maarten P M Vanhove, Chelsea L Wood
{"title":"Malaria Prevalence Near African Mangroves: Negative Association With Mangrove Extent, but Positive Association With Mangrove Greenness.","authors":"Armando J Cruz-Laufer, Farid Dahdouh-Guebas, Dakeishla M Díaz-Morales, Olexiy Kyrychenko, Maarten P M Vanhove, Chelsea L Wood","doi":"10.1111/gcb.71058","DOIUrl":"10.1111/gcb.71058","url":null,"abstract":"<p><p>Malaria remains a major public health challenge, causing an estimated 600,000 deaths and 250 million infections annually. Most malaria control efforts focus on freshwater mosquito vectors, leaving saltwater-tolerant vector mosquitoes inhabiting coastal ecosystems like mangrove forests understudied. Historically, the role of mangrove forests as breeding grounds for malaria vectors often motivated their destruction. However, mangroves provide crucial ecosystem services, and their impact on malaria transmission remains poorly understood. This study presents the first multi-country analysis linking African mangrove forests to prevalence of malaria (Plasmodium falciparum). We employed piecewise structural equation models to examine the relationships among mangrove land cover and mangrove vegetation greenness across coastal settlements in 27 African countries. We combined satellite-derived land cover, vegetation, and weather data with malaria prevalence records from 11 years, ranging from 1996 to 2020. We found two key associations. First, increasing mangrove land cover is associated with decreasing malaria prevalence at coarse spatial resolution, refuting the traditional view of mangroves as disease-promoting environments. We hypothesise that this relationship may reflect ecological factors such as reduced larval development due to shading, or the presence of predators. Second, at fine and coarse spatial resolutions, increasing mangrove health (i.e., greener vegetation) is associated with increasing malaria prevalence. This trend may be driven by higher mosquito abundance and biodiversity in vegetation-rich mangrove areas, consistent with studies showing vegetation as a positive predictor of mosquito population density. Our findings constitute continent-wide patterns derived from observational data, whereas the precise impact of mangrove vegetation likely depends on the geographic location, configuration of the forests, and the identity and competence of host and vector species. We conclude that mangrove conservation needs to be integrated with locally adapted, context-specific vector management strategies.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"32 9","pages":"e71058"},"PeriodicalIF":12.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC13536919/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148872393","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hui Wang, Jianbei Huang, Fernando T Maestre, Guang Zhao, Nan Lu, Cong Wang, Weiliang Chen, De Shorn E Bramble, Marion Schrumpf, Michaela A Dippold, Yangjian Zhang, Sönke Zaehle, Bojie Fu, Susan Trumbore
{"title":"Radiocarbon Reveals Modern Carbon Exchange With Topsoil Inorganic Carbon in Drylands.","authors":"Hui Wang, Jianbei Huang, Fernando T Maestre, Guang Zhao, Nan Lu, Cong Wang, Weiliang Chen, De Shorn E Bramble, Marion Schrumpf, Michaela A Dippold, Yangjian Zhang, Sönke Zaehle, Bojie Fu, Susan Trumbore","doi":"10.1111/gcb.71095","DOIUrl":"https://doi.org/10.1111/gcb.71095","url":null,"abstract":"<p><p>Drylands store most of the global soil inorganic carbon (SIC), yet the extent to which this pool interacts with contemporary carbon (C) cycling remains poorly understood. To test whether SIC behaves primarily as an inert geological reservoir or instead bears a modern carbon imprint, we quantified SIC content and radiocarbon (∆<sup>14</sup>C) at 42 dryland sites spanning broad aridity gradients across Eurasia. We also evaluated the climatic, edaphic, and biotic factors associated with variation in ∆<sup>14</sup>C-SIC. Across all sites, topsoil SIC (~0-10 cm) was strongly depleted in <sup>14</sup>C but consistently enriched relative to <sup>14</sup>C-dead carbonates, indicating that it contains a measurable component derived from modern carbon inputs. In the Chinese drylands, ∆<sup>14</sup>C-SIC declined with increasing aridity, consistent with weaker modern carbon exchange under drier conditions and a greater contribution of inherited or <sup>14</sup>C-depleted carbonate carbon. Soil pH and ∆<sup>14</sup>C of soil organic carbon were the strongest predictors of ∆<sup>14</sup>C-SIC, suggesting that carbonate dissolution-reprecipitation and the age of carbon entering soil CO<sub>2</sub> play key roles in determining SIC origins. At a subset of nine Chinese sites, ∆<sup>14</sup>C-SIC declined sharply with depth and approached <sup>14</sup>C-dead values in subsoils, indicating little influence of modern carbon in deeper carbonate pools. The presence of mixed <sup>14</sup>C-depleted and modern <sup>14</sup>C signatures in SIC potentially complicates the use of SIC isotopic signatures as proxies of environmental conditions. Together, our results indicate that dryland topsoil SIC commonly carries a measurable modern carbon signature that is tightly linked to contemporary carbon cycling. This coupling weakens with increasing aridity and soil depth, suggesting that environmental change in drylands may reshape one of the planet's largest carbon pools not only through changes in SIC stocks, but also through shifts in carbonate radiocarbon signatures and sources.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"32 9","pages":"e71095"},"PeriodicalIF":12.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148890485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tyler R Ross, Gregory W Thiemann, Martyn E Obbard, Kevin R Middel, Joseph M Northrup
{"title":"Habitat Selection and Intrapopulation Spatial Segregation in an Arctic Top Predator at the Southern Limit of Its Range.","authors":"Tyler R Ross, Gregory W Thiemann, Martyn E Obbard, Kevin R Middel, Joseph M Northrup","doi":"10.1111/gcb.71024","DOIUrl":"https://doi.org/10.1111/gcb.71024","url":null,"abstract":"<p><p>Accounting for spatial structure within populations is critical for defining appropriate scales of management, particularly in the Arctic, where habitats of ice-dependent species such as the polar bear (Ursus maritimus) are being transformed at an accelerated rate. We examined broad-scale patterns of space use and finer-scale habitat selection by adult female polar bears in James Bay, located at the southernmost extent of the species' global range. Using satellite telemetry data collected during the annual on-ice period from 2012 to 2017, we estimated individual- and population-level utilization distributions (UDs) and applied hierarchical clustering to assess whether individuals formed distinct spatial groups based on the degree of UD overlap. We also fit step-selection functions (SSFs) to evaluate selection for sea-ice concentration, ocean depth, and distance to coast. Fifteen bears with data spanning at least one complete on-ice period had individual 95% UDs averaging 74,770 km<sup>2</sup> (SE = 11,663). Results of hierarchical clustering identified two distinct spatial groups: three \"resident\" bears remained within southern James Bay, whereas 12 \"non-resident\" bears had larger UDs extending into Hudson Bay. Overlap between groups remained near zero throughout winter, including during the breeding season. Step-selection analyses, which included an additional four bears (n<sub>total</sub> = 19), indicated consistent positive selection for high sea-ice concentration, with individual variation in selection strength. For non-resident bears, selection for distance to coast and ocean depth varied seasonally, with bears selecting areas farther from the Ontario coast during freeze-up, closer to the coast during April-May, and deeper offshore areas during breakup. Together with previous genetic evidence, our results suggest resident southern James Bay bears represent a spatially structured component of the broader subpopulation that warrants continued monitoring and explicit consideration in future harvest-risk assessments and conservation planning, particularly as sea-ice loss continues to alter habitat availability.</p>","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"32 9","pages":"e71024"},"PeriodicalIF":12.5,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148890561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Youbing Zhou, Jifa Cui, Wenwen Chen, Nan Wu, Chris Newman, Juncheng Li, Qian Wang, Boyu Lei, Guanghua Jiang, Jinwei Wu, Christina D. Buesching, Jin Zhao, David W. Macdonald, Nils Chr. Stenseth
{"title":"Compound Ecoclimatic Events: The Long‐Term Recovery of Conservation‐Priority Mammals After an Extreme Ice Storm Event Was Promoted by the Alleviation of Poaching","authors":"Youbing Zhou, Jifa Cui, Wenwen Chen, Nan Wu, Chris Newman, Juncheng Li, Qian Wang, Boyu Lei, Guanghua Jiang, Jinwei Wu, Christina D. Buesching, Jin Zhao, David W. Macdonald, Nils Chr. Stenseth","doi":"10.1111/gcb.71084","DOIUrl":"https://doi.org/10.1111/gcb.71084","url":null,"abstract":"Extreme climatic perturbations are becoming increasingly frequent, with substantial and long‐lasting legacy effects on biodiversity and ecosystems that may be compounded by human pressures such as illegal hunting. It is therefore vital to develop a better understanding of how best to manage and enhance ecosystem recovery. Using 15 years of data (2005–2019) from subtropical China, we investigated how an extreme ice storm event (2008) degraded mammal communities and how recovery was enhanced by subsequent anti‐poaching enforcement (2012). Prior to the storm, communities were temporally stable, with a diversity of conservation‐priority species in primary forests, while less protected species dominated degraded forests. Overall, the storm caused a 35% loss in species richness and abundance, with a 50% decline in conservation‐priority species, all of which were obligate herbivores. Community properties in degraded forests recovered much more slowly than those in primary forests. Mammal communities did not regain dynamic stability when they reached their pre‐storm levels; instead, legal enforcement in 2012 caused a shift toward a greater proportion of conservation‐priority species, especially in degraded habitats, indicating that long‐term reductions in abundance and species richness among conservation‐priority mammal species were exacerbated by illegal poaching after this extreme storm event. These findings highlight that adaptive restoration management following extreme climatic events is essential for directing recovery trajectories toward achieving conservation and biodiversity targets, particularly for conservation‐priority species, and especially in areas most vulnerable to human disturbance.","PeriodicalId":175,"journal":{"name":"Global Change Biology","volume":"9 1","pages":""},"PeriodicalIF":11.6,"publicationDate":"2026-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148858877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}