Juliana Gastaldello Rando, Eduardo Koerich Nery, Anselmo Nogueira, Matheus Martins Teixeira Cota, Alexandre Zuntini, Suzana Alcantara, Gwilym Peter Lewis, Domingos Cardoso, Luciano Paganucci de Queiroz, José Rubens Pirani
Aim
We reconstructed the biogeographical history of a species-rich legume genus by testing alternative hypotheses on the origin and expansion of neotropical open-vegetation areas, with particular emphasis on the campos rupestres.
Location
Neotropics.
Taxon
Chamaecrista (Leguminosae), one of the most speciose genera of the neotropical region.
Methods
We reconstructed a fossil-calibrated phylogeny of Chamaecrista species and built a comprehensive database of species occurrences. We fitted and compared nine biogeographic models that differed in area availability and dispersal rates across time frames. These time frames were defined based on major climatic processes that have influenced neotropical open-vegetation areas.
Results and Main Conclusions
Under the best-fitting biogeographical model, Chamaecrista originated in the Amazon during the Mid Eocene. A single ancestral Chamaecrista lineage colonised the campos rupestres before the Late Oligocene–Mid Miocene, when climatic shifts presumably expanded lowland open-vegetation areas in the Neotropics. Most diversification of Chamaecrista species occurred in the campos rupestres from the Late Miocene to the Quaternary. Multiple ancestral Chamaecrista lineages dispersed from the campos rupestres to the Cerrado from the Mid Miocene onwards, while few lineages dispersed into the Caatinga during the same period. We propose that the campos rupestres might have functioned as a montane reservoir of plant diversity, harbouring lineages that later dispersed into adjacent lowland areas.
{"title":"From Rainforests to Open-Vegetation: The Biogeographic History of Chamaecrista (Leguminosae) in the Neotropics","authors":"Juliana Gastaldello Rando, Eduardo Koerich Nery, Anselmo Nogueira, Matheus Martins Teixeira Cota, Alexandre Zuntini, Suzana Alcantara, Gwilym Peter Lewis, Domingos Cardoso, Luciano Paganucci de Queiroz, José Rubens Pirani","doi":"10.1111/jbi.70137","DOIUrl":"https://doi.org/10.1111/jbi.70137","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>We reconstructed the biogeographical history of a species-rich legume genus by testing alternative hypotheses on the origin and expansion of neotropical open-vegetation areas, with particular emphasis on the <i>campos rupestres</i>.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Neotropics.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p><i>Chamaecrista</i> (Leguminosae), one of the most speciose genera of the neotropical region.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We reconstructed a fossil-calibrated phylogeny of <i>Chamaecrista</i> species and built a comprehensive database of species occurrences. We fitted and compared nine biogeographic models that differed in area availability and dispersal rates across time frames. These time frames were defined based on major climatic processes that have influenced neotropical open-vegetation areas.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results and Main Conclusions</h3>\u0000 \u0000 <p>Under the best-fitting biogeographical model, <i>Chamaecrista</i> originated in the Amazon during the Mid Eocene. A single ancestral <i>Chamaecrista</i> lineage colonised the <i>campos rupestres</i> before the Late Oligocene–Mid Miocene, when climatic shifts presumably expanded lowland open-vegetation areas in the Neotropics. Most diversification of <i>Chamaecrista</i> species occurred in the <i>campos rupestres</i> from the Late Miocene to the Quaternary. Multiple ancestral <i>Chamaecrista</i> lineages dispersed from the <i>campos rupestres</i> to the Cerrado from the Mid Miocene onwards, while few lineages dispersed into the Caatinga during the same period. We propose that the <i>campos rupestres</i> might have functioned as a montane reservoir of plant diversity, harbouring lineages that later dispersed into adjacent lowland areas.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jbi.70137","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146007426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
<div> <section> <h3> Aim</h3> <p>Intensifying climatic seasonality drives spatial reorganisation in mountains, but the niche processes underlying seasonal elevational shifts remain insufficiently understood. We test how seasonal changes in climate niche position (optima) and niche breadth (the range of climatic conditions that a species experiences over space and time) along temperature and precipitation gradients predict the direction and distance of bird elevational shifts.</p> </section> <section> <h3> Location</h3> <p>Hengduan Mountains, southwest China.</p> </section> <section> <h3> Taxon</h3> <p>Breeding birds.</p> </section> <section> <h3> Methods</h3> <p>We analysed 42,458 records of 206 species from field surveys and citizen-science data. We quantified elevational shift direction and distance using the signed and absolute differences between seasonal median elevations. Using fine-resolution climatic data, we estimated key climatic niche metrics—seasonal optima, annual breadth, seasonal breadth change, and overlap—and evaluated their power to predict shift direction and distance alongside functional traits using phylogenetic Bayesian models.</p> </section> <section> <h3> Results</h3> <p>We identified three post-breeding elevational strategies: upslope, downslope, and resident. Although moving in opposite directions, upslope and downslope shifters exhibited congruent seasonal directions of climatic niche change. Bayesian analyses revealed that shift direction in downslope species was associated with seasonal changes in both climatic optima and niche breadth, whereas for upslope species, it was linked primarily to seasonal niche breadth change. Furthermore, shift distance across both groups corresponded to the magnitude of seasonal niche breadth change, while diet and dispersal capacity showed distinct associations with these spatial responses.</p> </section> <section> <h3> Conclusions</h3> <p>We show that opposing spatial trajectories arise from distinct niche mechanisms. Downslope shifts combine the tracking of climatic optima with seasonal changes in niche breadth, whereas upslope shifts are linked predominantly to the reorganisation of niche breadth. This divergence reflects different sensitivities to mean climatic conditions versus seasonal variability along both temperature and precipitation axes, highlighting that integrating niche position and breadth dynamics is essential for predicting how species redistribute along elevational gradients as seasonal climat
{"title":"Temperature and Precipitation Niche Dynamics Shape Avian Elevational Shift Strategies in the Hengduan Mountains","authors":"Shangmingyu Zhang, Yiwei Cao, Yibo Wang, Jiayu Zhang, Jianghong Ran, Muyang Lu, Yongjie Wu","doi":"10.1111/jbi.70148","DOIUrl":"https://doi.org/10.1111/jbi.70148","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>Intensifying climatic seasonality drives spatial reorganisation in mountains, but the niche processes underlying seasonal elevational shifts remain insufficiently understood. We test how seasonal changes in climate niche position (optima) and niche breadth (the range of climatic conditions that a species experiences over space and time) along temperature and precipitation gradients predict the direction and distance of bird elevational shifts.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Hengduan Mountains, southwest China.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p>Breeding birds.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We analysed 42,458 records of 206 species from field surveys and citizen-science data. We quantified elevational shift direction and distance using the signed and absolute differences between seasonal median elevations. Using fine-resolution climatic data, we estimated key climatic niche metrics—seasonal optima, annual breadth, seasonal breadth change, and overlap—and evaluated their power to predict shift direction and distance alongside functional traits using phylogenetic Bayesian models.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>We identified three post-breeding elevational strategies: upslope, downslope, and resident. Although moving in opposite directions, upslope and downslope shifters exhibited congruent seasonal directions of climatic niche change. Bayesian analyses revealed that shift direction in downslope species was associated with seasonal changes in both climatic optima and niche breadth, whereas for upslope species, it was linked primarily to seasonal niche breadth change. Furthermore, shift distance across both groups corresponded to the magnitude of seasonal niche breadth change, while diet and dispersal capacity showed distinct associations with these spatial responses.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>We show that opposing spatial trajectories arise from distinct niche mechanisms. Downslope shifts combine the tracking of climatic optima with seasonal changes in niche breadth, whereas upslope shifts are linked predominantly to the reorganisation of niche breadth. This divergence reflects different sensitivities to mean climatic conditions versus seasonal variability along both temperature and precipitation axes, highlighting that integrating niche position and breadth dynamics is essential for predicting how species redistribute along elevational gradients as seasonal climat","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146007427","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Recently in this journal, Siqueira-Silva and colleagues forecast the effects of climate change on the vegetation of Chimborazo in the future (2070) based on species distribution models for 134 species ‘native of Chimborazo’ and predicted future trends consistent with past observed upslope shifts since von Humboldt and Bonpland's expedition in 1802. The 134 species come from 15 transects at 3800–5200 m on one side of the mountain made in 2012, with the hope that the combined ‘vegetation surveys on Mt. Chimborazo in 1802 and 2012 offer valuable information on plant assemblages through observational data.’ Humboldt's detailed account of his ascent of the Chimborazo, however, makes clear that his team was unable to collect plants due to inclement weather, and indeed of Humboldt's 156 total Andean collections, only eight come from the Chimborazo's lower slopes. The seemingly unstoppable myth of a supposed 1802 vegetation survey on Mt. Chimborazo is a disservice to biogeography and continues to procreate alternative facts.
{"title":"Is the Myth of Humboldt's Vegetation Survey on Mt. Chimborazo Becoming a Nightmare?","authors":"Susanne S. Renner","doi":"10.1111/jbi.70146","DOIUrl":"https://doi.org/10.1111/jbi.70146","url":null,"abstract":"<div>\u0000 \u0000 <p>Recently in this journal, Siqueira-Silva and colleagues forecast the effects of climate change on the vegetation of Chimborazo in the future (2070) based on species distribution models for 134 species ‘native of Chimborazo’ and predicted future trends consistent with past observed upslope shifts since von Humboldt and Bonpland's expedition in 1802. The 134 species come from 15 transects at 3800–5200 m on one side of the mountain made in 2012, with the hope that the combined ‘vegetation surveys on Mt. Chimborazo in 1802 and 2012 offer valuable information on plant assemblages through observational data.’ Humboldt's detailed account of his ascent of the Chimborazo, however, makes clear that his team was unable to collect plants due to inclement weather, and indeed of Humboldt's 156 total Andean collections, only eight come from the Chimborazo's lower slopes. The seemingly unstoppable myth of a supposed 1802 vegetation survey on Mt. Chimborazo is a disservice to biogeography and continues to procreate alternative facts.</p>\u0000 </div>","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146002032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Turtles are widely distributed across continental freshwater systems in the Western Palearctic and Nearctic regions. Nevertheless, the two regions differ markedly in species richness, with 55 species in the Nearctic assemblage and only seven in the Western Palearctic. This study investigated the interplay between environmental filters (hydrological, climatic, and landscape factors), species traits, and species phylogenetic relatedness in shaping the spatial patterns of Holarctic freshwater turtles.
Location
Western Palearctic and Nearctic.
Time Period
Present day.
Major Taxa Studied
Freshwater turtles (order Testudines).
Materials and Methods
Locality data for 62 turtle species were collected from open-access databases. Distance-based redundancy analysis was conducted to assess the influence of environmental, species trait, and phylogenetic components on species spatial distribution matrices.
Results
In the Western Palearctic and Nearctic regions, climate and landscape variables were highly associated with the spatial patterns, with these relationships being stronger in the Nearctic than in the Western Palearctic. In both regions, phylogenetic relatedness was also correlated with the structuring of species distributions, although this association appeared more marked in the Western Palearctic. Hydrological factors and species traits showed only weak relationships with the spatial configuration.
Conclusions
The Western Palearctic and Nearctic regions differ significantly in the richness of their freshwater turtle assemblages. In the Nearctic, the spatial relationships among species show stronger associations with environmental conditions than in the Western Palearctic. This pattern is consistent with a high diversity of assemblages composed of closely related species that exhibit fine-scale turnover along environmental gradients.
{"title":"Unravelling Regional Patterns in Freshwater Turtle Diversity: Insights From the Western Palearctic and Nearctic","authors":"Daniel Escoriza","doi":"10.1111/jbi.70145","DOIUrl":"https://doi.org/10.1111/jbi.70145","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>Turtles are widely distributed across continental freshwater systems in the Western Palearctic and Nearctic regions. Nevertheless, the two regions differ markedly in species richness, with 55 species in the Nearctic assemblage and only seven in the Western Palearctic. This study investigated the interplay between environmental filters (hydrological, climatic, and landscape factors), species traits, and species phylogenetic relatedness in shaping the spatial patterns of Holarctic freshwater turtles.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Western Palearctic and Nearctic.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Time Period</h3>\u0000 \u0000 <p>Present day.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Major Taxa Studied</h3>\u0000 \u0000 <p>Freshwater turtles (order Testudines).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Materials and Methods</h3>\u0000 \u0000 <p>Locality data for 62 turtle species were collected from open-access databases. Distance-based redundancy analysis was conducted to assess the influence of environmental, species trait, and phylogenetic components on species spatial distribution matrices.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>In the Western Palearctic and Nearctic regions, climate and landscape variables were highly associated with the spatial patterns, with these relationships being stronger in the Nearctic than in the Western Palearctic. In both regions, phylogenetic relatedness was also correlated with the structuring of species distributions, although this association appeared more marked in the Western Palearctic. Hydrological factors and species traits showed only weak relationships with the spatial configuration.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Conclusions</h3>\u0000 \u0000 <p>The Western Palearctic and Nearctic regions differ significantly in the richness of their freshwater turtle assemblages. In the Nearctic, the spatial relationships among species show stronger associations with environmental conditions than in the Western Palearctic. This pattern is consistent with a high diversity of assemblages composed of closely related species that exhibit fine-scale turnover along environmental gradients.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Amid ongoing and accelerating global change, predicting the ecological consequences of future species loss is important for prioritising conservation actions to protect biodiversity. Species richness has long been thought to protect communities from species loss by providing ecological redundancy, whereby the loss of any one species hardly impacts the integrity of the wider community due to overlap in species' ecological roles. However, the extent to which species richness will buffer the impacts of future species loss remains unclear due to concurrent variation in both the distribution and ecological roles of species likely to be lost.
Location
Canada.
Taxon
Terrestrial vertebrates.
Methods
To understand how future species loss threatens ecosystems and whether species richness mitigates this threat, we simulated the loss of imperilled taxa from Canadian ecosystems across spatial scales and measured the extent to which community functional and interaction (predator–prey) diversity, two important components of ecosystem integrity, declined.
Results
We report that, despite harbouring far fewer species at risk, northern ecosystems are disproportionately vulnerable, whereby the loss of imperilled taxa could result in up to 25% and 20% declines in functional and interaction diversity, respectively. Surprisingly, despite high species richness, some southern ecosystems containing high numbers of imperilled taxa were also vulnerable, indicating that richness alone is likely insufficient at predicting community vulnerability to species loss.
Main Conclusions
Together, these findings demonstrate the need to account for future species loss when evaluating the vulnerability of Earth's ecosystems and highlight the importance of conserving species at risk, specifically in northern communities where they potentially play outsized roles in structuring and maintaining the integrity of ecosystems.
{"title":"Species Loss Scenarios Identify Canada's Northern Ecosystems as Disproportionately Vulnerable","authors":"Isaac Eckert, Dominique Caron, Laura J. Pollock","doi":"10.1111/jbi.70139","DOIUrl":"https://doi.org/10.1111/jbi.70139","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>Amid ongoing and accelerating global change, predicting the ecological consequences of future species loss is important for prioritising conservation actions to protect biodiversity. Species richness has long been thought to protect communities from species loss by providing ecological redundancy, whereby the loss of any one species hardly impacts the integrity of the wider community due to overlap in species' ecological roles. However, the extent to which species richness will buffer the impacts of future species loss remains unclear due to concurrent variation in both the distribution and ecological roles of species likely to be lost.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Canada.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p>Terrestrial vertebrates.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>To understand how future species loss threatens ecosystems and whether species richness mitigates this threat, we simulated the loss of imperilled taxa from Canadian ecosystems across spatial scales and measured the extent to which community functional and interaction (predator–prey) diversity, two important components of ecosystem integrity, declined.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>We report that, despite harbouring far fewer species at risk, northern ecosystems are disproportionately vulnerable, whereby the loss of imperilled taxa could result in up to 25% and 20% declines in functional and interaction diversity, respectively. Surprisingly, despite high species richness, some southern ecosystems containing high numbers of imperilled taxa were also vulnerable, indicating that richness alone is likely insufficient at predicting community vulnerability to species loss.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Main Conclusions</h3>\u0000 \u0000 <p>Together, these findings demonstrate the need to account for future species loss when evaluating the vulnerability of Earth's ecosystems and highlight the importance of conserving species at risk, specifically in northern communities where they potentially play outsized roles in structuring and maintaining the integrity of ecosystems.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jbi.70139","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145983868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Nicholas H. Coppock, Andrew G. Cannizzaro, Kirstie D. Grant, Thomas R. Sawicki
<div> <section> <h3> Aim</h3> <p>This study investigated how Miocene-aged vicariance and coastal landscape change have driven estuarine diversification in the southeastern United States. By examining newly documented Gulf Coast populations of <i>Gammarus</i> nr. <i>daiberi</i> from the Wakulla River, Florida, and a new <i>Gammarus</i> sp. from Loving Creek, Louisiana, we resolved their phylogenetic relationships within the <i>G. daiberi</i>–<i>G. tigrinus</i> complex and assessed whether they represent distinct evolutionary lineages. We specifically tested the hypothesis that geological reconfiguration of the Florida peninsula and adjacent coastal plain generated the observed Gulf–Atlantic lineage split.</p> </section> <section> <h3> Location</h3> <p>Atlantic and Gulf Coasts of the United States of America.</p> </section> <section> <h3> Taxon</h3> <p> <i>Gammarus daiberi, G. tigrinus.</i> </p> </section> <section> <h3> Methods</h3> <p>Live amphipods were collected, morphologically identified and preserved in 100% molecular-grade ethanol. DNA was extracted, and four loci (mitochondrial 16S rRNA, COI; nuclear 18S rRNA, 28S rRNA) were PCR-amplified and Sanger-sequenced. Alignments were screened for quality and contamination. Phylogenetic trees were reconstructed from concatenated datasets using maximum likelihood (IQ-TREE2) and Bayesian inference (MrBayes), with partitioned substitution models. Divergence times were estimated in BEAST under relaxed molecular clocks with four calibration points. Species delimitation employed BPP and STACEY, while ancestral ranges were inferred in RASP.</p> </section> <section> <h3> Results</h3> <p>The Wakulla River and Loving Creek populations form well-supported, genetically distinct lineages, separate from Atlantic <i>G. daiberi–G. tigrinus</i> clades. Divergence time estimates indicate a Miocene split approximately 5.7 Ma, coinciding with geological changes in the Florida peninsula. Species delimitation models confirm both Gulf Coast populations as undescribed cryptic taxa.</p> </section> <section> <h3> Main Conclusions</h3> <p>Genetic, phylogenetic and biogeographic evidence support a Miocene vicariance scenario underlying Gulf–Atlantic lineage divergence in <i>Gammarus daiberi sensu lato</i>. The southeastern coastal plain emerges as a hotspot for diversification of coastal and estuarine taxa, shaped by paleogeographic processes, and highlights the need for expanded sampling to reveal hidden estuarine biodiv
目的：本研究探讨了中新世间隔期和海岸景观变化如何推动美国东南部河口多样化。通过研究来自佛罗里达州瓦库拉河的新记录的墨西哥湾沿岸Gammarus n . daiberi种群和来自路易斯安那州Loving Creek的新Gammarus sp.，我们解决了它们在G. daiberi - g中的系统发育关系。并评估它们是否代表了不同的进化谱系。我们特别测试了佛罗里达半岛和邻近海岸平原的地质重构产生了观察到的海湾-大西洋谱系分裂的假设。地理位置：美国大西洋和墨西哥湾沿岸。大鲵分类群，大鲵。方法收集活片脚类动物，经形态学鉴定，保存于100%分子级乙醇中。提取DNA，对4个基因座（线粒体16S rRNA、COI；细胞核18S rRNA、28S rRNA）进行pcr扩增和sanger测序。对校准进行质量和污染筛选。利用最大似然（IQ-TREE2）和贝叶斯推理（MrBayes），利用分区替代模型，从连接的数据集重建系统发育树。在具有四个校准点的松弛分子钟下，在BEAST中估计散度时间。物种划分采用BPP和STACEY方法，祖先范围采用RASP方法。结果Wakulla河种群和Loving Creek种群形成了良好的支持，遗传上不同的谱系，与大西洋大贝里- g分离。tigrinus演化支。分裂时间估计表明中新世分裂约5.7 Ma，与佛罗里达半岛的地质变化相吻合。物种划分模型证实两个墨西哥湾沿岸的种群都是已描述的隐型分类群。主要结论：遗传、系统发育和生物地理证据支持中新世墨西哥湾-大西洋Gammarus daiberi sensu lato谱系分化的可能性。受古地理过程的影响，东南沿海平原成为海岸和河口类群多样化的热点，并强调需要扩大采样以揭示隐藏的河口生物多样性。
{"title":"The Florida Peninsula as an Engine of Estuarine Evolution: Insights From Gammarus daiberi Bousfield, 1969 (Crustacea: Amphipoda)","authors":"Nicholas H. Coppock, Andrew G. Cannizzaro, Kirstie D. Grant, Thomas R. Sawicki","doi":"10.1111/jbi.70130","DOIUrl":"https://doi.org/10.1111/jbi.70130","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>This study investigated how Miocene-aged vicariance and coastal landscape change have driven estuarine diversification in the southeastern United States. By examining newly documented Gulf Coast populations of <i>Gammarus</i> nr. <i>daiberi</i> from the Wakulla River, Florida, and a new <i>Gammarus</i> sp. from Loving Creek, Louisiana, we resolved their phylogenetic relationships within the <i>G. daiberi</i>–<i>G. tigrinus</i> complex and assessed whether they represent distinct evolutionary lineages. We specifically tested the hypothesis that geological reconfiguration of the Florida peninsula and adjacent coastal plain generated the observed Gulf–Atlantic lineage split.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Atlantic and Gulf Coasts of the United States of America.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p>\u0000 <i>Gammarus daiberi, G. tigrinus.</i>\u0000 </p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Live amphipods were collected, morphologically identified and preserved in 100% molecular-grade ethanol. DNA was extracted, and four loci (mitochondrial 16S rRNA, COI; nuclear 18S rRNA, 28S rRNA) were PCR-amplified and Sanger-sequenced. Alignments were screened for quality and contamination. Phylogenetic trees were reconstructed from concatenated datasets using maximum likelihood (IQ-TREE2) and Bayesian inference (MrBayes), with partitioned substitution models. Divergence times were estimated in BEAST under relaxed molecular clocks with four calibration points. Species delimitation employed BPP and STACEY, while ancestral ranges were inferred in RASP.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>The Wakulla River and Loving Creek populations form well-supported, genetically distinct lineages, separate from Atlantic <i>G. daiberi–G. tigrinus</i> clades. Divergence time estimates indicate a Miocene split approximately 5.7 Ma, coinciding with geological changes in the Florida peninsula. Species delimitation models confirm both Gulf Coast populations as undescribed cryptic taxa.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Main Conclusions</h3>\u0000 \u0000 <p>Genetic, phylogenetic and biogeographic evidence support a Miocene vicariance scenario underlying Gulf–Atlantic lineage divergence in <i>Gammarus daiberi sensu lato</i>. The southeastern coastal plain emerges as a hotspot for diversification of coastal and estuarine taxa, shaped by paleogeographic processes, and highlights the need for expanded sampling to reveal hidden estuarine biodiv","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145958158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Prashant Paudel, Stefan Olin, Mark Tjoelker, Mikael Pontarp, Daniel Metcalfe, Benjamin Smith
<div> <section> <h3> Aim</h3> <p>Allometric relationships, which describe plant growth patterns shaped by environmental conditions, reflect functional trade-offs and represent key functional traits that optimise adaptation, resource acquisition, stress tolerance and competition. Here, we assess how these allometric relationships and associated functional trade-offs drive ecosystem structure, functioning and competitive interactions between plant functional types (PFTs) in savanna ecosystems.</p> </section> <section> <h3> Location</h3> <p>Rainfall gradient, North Australian Tropical Transect (NATT), Australia.</p> </section> <section> <h3> Time Period</h3> <p>1901–2022.</p> </section> <section> <h3> Taxon</h3> <p>Tree species of Northern Australia.</p> </section> <section> <h3> Methods</h3> <p>Using quantile regression, we established adaptive allometric relationships among diameter at breast height, tree height, crown radius and crown volume. These relationships were integrated into a dynamic vegetation model to simulate tree growth and competitive interactions in local patches across the broader savanna landscape. The model was validated using observed biomass, height, leaf area index and productivity data from six flux tower sites across the NATT. A neighbour removal experiment was conducted to analyse PFT performance under varying competitive pressure, expressed as a competitive index.</p> </section> <section> <h3> Results</h3> <p>The results demonstrate that incorporating adaptive allometric relationships improved the model's ability to represent vegetation dynamics and productivity. Tall <i>Eucalyptus</i> PFTs exhibited competitive dominance in high rainfall areas, while <i>Acacia</i> and other deciduous species thrived under drier conditions. The neighbour removal experiment revealed that competition strongly influenced PFT performance, with carbon mass production varying significantly between stand types. Tall <i>Eucalyptus</i> PFTs showed little response to neighbour removal, while other PFTs benefitted strongly from neighbour removal. The competitive index of PFTs increased significantly with rainfall, indicating stronger competition under wetter conditions.</p> </section> <section> <h3> Main Conclusions</h3> <p>Our findings suggest that savanna ecosystems are shaped by complex interactions between growth conditions, functional traits and adaptive strategies for coping with competiti
{"title":"Impacts of Tree Allometry on Structure, Composition, Functioning and Competitive Interactions in Savanna Ecosystems on the Northern Australian Tropical Transect","authors":"Prashant Paudel, Stefan Olin, Mark Tjoelker, Mikael Pontarp, Daniel Metcalfe, Benjamin Smith","doi":"10.1111/jbi.70131","DOIUrl":"https://doi.org/10.1111/jbi.70131","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>Allometric relationships, which describe plant growth patterns shaped by environmental conditions, reflect functional trade-offs and represent key functional traits that optimise adaptation, resource acquisition, stress tolerance and competition. Here, we assess how these allometric relationships and associated functional trade-offs drive ecosystem structure, functioning and competitive interactions between plant functional types (PFTs) in savanna ecosystems.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Rainfall gradient, North Australian Tropical Transect (NATT), Australia.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Time Period</h3>\u0000 \u0000 <p>1901–2022.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p>Tree species of Northern Australia.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>Using quantile regression, we established adaptive allometric relationships among diameter at breast height, tree height, crown radius and crown volume. These relationships were integrated into a dynamic vegetation model to simulate tree growth and competitive interactions in local patches across the broader savanna landscape. The model was validated using observed biomass, height, leaf area index and productivity data from six flux tower sites across the NATT. A neighbour removal experiment was conducted to analyse PFT performance under varying competitive pressure, expressed as a competitive index.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>The results demonstrate that incorporating adaptive allometric relationships improved the model's ability to represent vegetation dynamics and productivity. Tall <i>Eucalyptus</i> PFTs exhibited competitive dominance in high rainfall areas, while <i>Acacia</i> and other deciduous species thrived under drier conditions. The neighbour removal experiment revealed that competition strongly influenced PFT performance, with carbon mass production varying significantly between stand types. Tall <i>Eucalyptus</i> PFTs showed little response to neighbour removal, while other PFTs benefitted strongly from neighbour removal. The competitive index of PFTs increased significantly with rainfall, indicating stronger competition under wetter conditions.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Main Conclusions</h3>\u0000 \u0000 <p>Our findings suggest that savanna ecosystems are shaped by complex interactions between growth conditions, functional traits and adaptive strategies for coping with competiti","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145964143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Osmar J. Luiz, Bruno E. Soares, Lucas T. Nunes, Israel Hidenburgo Cintra, Ronaldo Borges Barthem, Alexandre P. Marceniuk
<div> <section> <h3> Aim</h3> <p>To investigate the spatial and temporal dynamics of fish assemblages across the Northern Brazilian Shelf, a vast and complex ecosystem influenced by the Amazon River plume, we aimed to identify fish assemblage types, understand transitions between them from the river mouth to offshore reefs, and examine seasonal changes related to plume dynamics.</p> </section> <section> <h3> Location</h3> <p>Northern Brazilian Shelf (Western Atlantic Ocean), from the Amazon River mouth to the Great Amazon Reef System (GARS).</p> </section> <section> <h3> Taxon</h3> <p>Actinopterygii and Elasmobranchii.</p> </section> <section> <h3> Methods</h3> <p>We applied a presence-absence Latent Dirichlet Allocation (LDA) model to fish occurrence records. This Bayesian mixed-membership probabilistic approach inferred latent assemblages by analysing co-occurring species and quantifying community types at the same site in varying proportions, suitable for characterising transitions. We then mapped these assemblages' proportional contributions and analysed their spatial distribution relative to seasonal changes in river discharge and freshwater plume influence.</p> </section> <section> <h3> Results</h3> <p>Four fish assemblages were identified with a clear coast-to-offshore zonation: (1) freshwater-tolerant plume assemblage near the river mouth; (2) an estuarine–mud–plain assemblage on the inner shelf; (3) a mixed-sand corridor assemblage in mid-shelf; and (4) a reef-associated assemblage on outer-shelf GARS. The first three assemblages showed a seasonal reorganisation. During the wet season, strong plume influence led to spatially segregated assemblages. Conversely, the dry season's reduced plume resulted in increased community overlap, centred on the mid-shelf assemblage. The reef assemblage (4) remained spatially stable across seasons.</p> </section> <section> <h3> Main Conclusions</h3> <p>The Amazon River plume's seasonal dynamics primarily drive fish community structure and connectivity across the Northern Brazilian Shelf. This study uncovers how assemblages transition from being shaped by environmental filtering (exhibiting strong zonation during peak plume) to a more overlapping distribution as plume influence weakens. These findings underscore the need for dynamic, seasonally adjusted management to conserve biodiversity and ecosystem function in this significant, and increasingly threatened, estuarine–marine transition zone.</p> </section> <
{"title":"Dynamic Transitions in Fish Community Composition From the Amazon River Plume to Offshore Reefs","authors":"Osmar J. Luiz, Bruno E. Soares, Lucas T. Nunes, Israel Hidenburgo Cintra, Ronaldo Borges Barthem, Alexandre P. Marceniuk","doi":"10.1111/jbi.70132","DOIUrl":"https://doi.org/10.1111/jbi.70132","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>To investigate the spatial and temporal dynamics of fish assemblages across the Northern Brazilian Shelf, a vast and complex ecosystem influenced by the Amazon River plume, we aimed to identify fish assemblage types, understand transitions between them from the river mouth to offshore reefs, and examine seasonal changes related to plume dynamics.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>Northern Brazilian Shelf (Western Atlantic Ocean), from the Amazon River mouth to the Great Amazon Reef System (GARS).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p>Actinopterygii and Elasmobranchii.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We applied a presence-absence Latent Dirichlet Allocation (LDA) model to fish occurrence records. This Bayesian mixed-membership probabilistic approach inferred latent assemblages by analysing co-occurring species and quantifying community types at the same site in varying proportions, suitable for characterising transitions. We then mapped these assemblages' proportional contributions and analysed their spatial distribution relative to seasonal changes in river discharge and freshwater plume influence.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Four fish assemblages were identified with a clear coast-to-offshore zonation: (1) freshwater-tolerant plume assemblage near the river mouth; (2) an estuarine–mud–plain assemblage on the inner shelf; (3) a mixed-sand corridor assemblage in mid-shelf; and (4) a reef-associated assemblage on outer-shelf GARS. The first three assemblages showed a seasonal reorganisation. During the wet season, strong plume influence led to spatially segregated assemblages. Conversely, the dry season's reduced plume resulted in increased community overlap, centred on the mid-shelf assemblage. The reef assemblage (4) remained spatially stable across seasons.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Main Conclusions</h3>\u0000 \u0000 <p>The Amazon River plume's seasonal dynamics primarily drive fish community structure and connectivity across the Northern Brazilian Shelf. This study uncovers how assemblages transition from being shaped by environmental filtering (exhibiting strong zonation during peak plume) to a more overlapping distribution as plume influence weakens. These findings underscore the need for dynamic, seasonally adjusted management to conserve biodiversity and ecosystem function in this significant, and increasingly threatened, estuarine–marine transition zone.</p>\u0000 </section>\u0000 <","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145986878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Afonso Kempner, Rodrigo Castro-Souza, Dieison André Moi, Danilo Trabuco do Amaral, Rosane Garcia Collevatti, Sidney F. Gouveia, Isabel A. S. Bonatelli, Thadeu Sobral-Souza
<div> <section> <h3> Aim</h3> <p>We aim to investigate the environmental drivers shaping macroecological patterns of phylogenetic structure in plants, using the cactus family (Cactaceae) as a model group.</p> </section> <section> <h3> Major Taxa and Location</h3> <p>Cactus family (Cactaceae), comprising 1892 species, distributed across the American continent (approximately 42 million km<sup>2</sup>).</p> </section> <section> <h3> Methods</h3> <p>We compiled a robust dataset of 435,694 occurrence records and estimated two complementary metrics of phylogenetic structure: the standardised effect size of mean phylogenetic distance (ses.MPD, reflecting deep/basal lineages) and mean nearest taxon distance (ses.MNTD, reflecting recent/tip lineages). We also assessed the effects of climatic, topographic, and soil-related variables on phylogenetic structure metrics at regional and continental scale.</p> </section> <section> <h3> Results</h3> <p>Phylogenetic structure in cacti is shaped by complex spatial interactions among environmental drivers varying across scales. Northern Mesoamerica—including central and northern Mexico and the southwestern United States—showed the highest ses.MPD but some of the lowest ses.MNTD values. This indicates that these regions harbour deeply divergent lineages while local communities remain composed of closely related species. Other regions, such as high-elevation areas in South America, also showed high ses.MPD and ses.MNTD, indicating both deep and recent phylogenetic divergence. ses.MPD and ses.MNTD responded differently to environmental gradients, indicating that basal and tip lineages are influenced by different factors. Historical temperature stability (calculated as the temperature delta between the last glacial maximum and the present) was the strongest predictor of phylogenetic structure, mainly on a regional scale. Solar radiation and elevation, at the continental scale, also contributed to these patterns, indicating that topographic complexity and climatic drives recent phylogenetic divergence.</p> </section> <section> <h3> Main Conclusions</h3> <p>Cactus phylogenetic diversity is primarily driven by historical temperature stability but results from the combined influence of multiple environmental drivers acting across scales. These scale-dependent effects reveal that cactus communities reflect both contemporary conditions and long-term evolutionary constraints. Given the link between PD, ecosystem functioning, and
{"title":"Historical Temperature Stability and Environmental Drivers Shape Patterns of Phylogenetic Diversity in Cactaceae","authors":"Afonso Kempner, Rodrigo Castro-Souza, Dieison André Moi, Danilo Trabuco do Amaral, Rosane Garcia Collevatti, Sidney F. Gouveia, Isabel A. S. Bonatelli, Thadeu Sobral-Souza","doi":"10.1111/jbi.70134","DOIUrl":"https://doi.org/10.1111/jbi.70134","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>We aim to investigate the environmental drivers shaping macroecological patterns of phylogenetic structure in plants, using the cactus family (Cactaceae) as a model group.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Major Taxa and Location</h3>\u0000 \u0000 <p>Cactus family (Cactaceae), comprising 1892 species, distributed across the American continent (approximately 42 million km<sup>2</sup>).</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We compiled a robust dataset of 435,694 occurrence records and estimated two complementary metrics of phylogenetic structure: the standardised effect size of mean phylogenetic distance (ses.MPD, reflecting deep/basal lineages) and mean nearest taxon distance (ses.MNTD, reflecting recent/tip lineages). We also assessed the effects of climatic, topographic, and soil-related variables on phylogenetic structure metrics at regional and continental scale.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>Phylogenetic structure in cacti is shaped by complex spatial interactions among environmental drivers varying across scales. Northern Mesoamerica—including central and northern Mexico and the southwestern United States—showed the highest ses.MPD but some of the lowest ses.MNTD values. This indicates that these regions harbour deeply divergent lineages while local communities remain composed of closely related species. Other regions, such as high-elevation areas in South America, also showed high ses.MPD and ses.MNTD, indicating both deep and recent phylogenetic divergence. ses.MPD and ses.MNTD responded differently to environmental gradients, indicating that basal and tip lineages are influenced by different factors. Historical temperature stability (calculated as the temperature delta between the last glacial maximum and the present) was the strongest predictor of phylogenetic structure, mainly on a regional scale. Solar radiation and elevation, at the continental scale, also contributed to these patterns, indicating that topographic complexity and climatic drives recent phylogenetic divergence.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Main Conclusions</h3>\u0000 \u0000 <p>Cactus phylogenetic diversity is primarily driven by historical temperature stability but results from the combined influence of multiple environmental drivers acting across scales. These scale-dependent effects reveal that cactus communities reflect both contemporary conditions and long-term evolutionary constraints. Given the link between PD, ecosystem functioning, and","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/jbi.70134","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145964144","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
Matías M. Malleret, Diego Baldo, Priscila Lemes, Francisco Brusquetti, Laura Verrastro, Arley Camargo
Aim
Pleistocene climatic oscillations induced climatic, environmental, and eustatic changes in the Chacoan-Pampean Plain (CPP), profoundly impacting species' distribution, genetic diversity, population dynamics, and lineage diversification. Herein, we investigated how riverine barriers, landscape, and climate influenced the distribution and diversification of frogs of the South American lowlands.
Location
The mid-latitude South American plains, including the Chaco and the Pampa biomes.
Taxon
Oven frog Leptodactylus latinasus.
Methods
We used mitochondrial sequences and genome-wide SNP data throughout the species' distribution to assess population structure, infer phylogenetic relationships, and estimate divergence times. Also, we implemented spatially explicit models, demographic analyses, and tested alternative hypotheses of isolation and migration. We used ecological niche modelling (ENM) to reconstruct changes in geographical distribution and potential ancestral areas.
Results
We detected strong intraspecific phylogeographic structure, with significant breaks coinciding with interglacial periods, while cold phases were associated with bottlenecks and secondary contact events. We observed an intergradation zone between the Paraná River and the Chacoan-Pampean biome limit, supported by significant bidirectional gene flow between nuclear groups.
Main Conclusions
Our findings highlight the effects of the climatic fluctuations on population dynamics and lineage divergence, the role of the Paraná River as a semipermeable barrier, the Chaco-Pampa ecotone as an environmental barrier, and the influence of sea level changes on lineage isolation and connectivity. The biogeographic pattern and divergence times of L. latinasus are concordant with the diversification of other frogs co-occurring in the CPP.
{"title":"Rivers, Environment, and Climate: Shaping an Oven Frog's Evolution in the Chaco and Pampa Lowlands of South America","authors":"Matías M. Malleret, Diego Baldo, Priscila Lemes, Francisco Brusquetti, Laura Verrastro, Arley Camargo","doi":"10.1111/jbi.70138","DOIUrl":"https://doi.org/10.1111/jbi.70138","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 <h3> Aim</h3>\u0000 \u0000 <p>Pleistocene climatic oscillations induced climatic, environmental, and eustatic changes in the Chacoan-Pampean Plain (CPP), profoundly impacting species' distribution, genetic diversity, population dynamics, and lineage diversification. Herein, we investigated how riverine barriers, landscape, and climate influenced the distribution and diversification of frogs of the South American lowlands.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Location</h3>\u0000 \u0000 <p>The mid-latitude South American plains, including the Chaco and the Pampa biomes.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Taxon</h3>\u0000 \u0000 <p>Oven frog <i>Leptodactylus latinasus.</i></p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Methods</h3>\u0000 \u0000 <p>We used mitochondrial sequences and genome-wide SNP data throughout the species' distribution to assess population structure, infer phylogenetic relationships, and estimate divergence times. Also, we implemented spatially explicit models, demographic analyses, and tested alternative hypotheses of isolation and migration. We used ecological niche modelling (ENM) to reconstruct changes in geographical distribution and potential ancestral areas.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Results</h3>\u0000 \u0000 <p>We detected strong intraspecific phylogeographic structure, with significant breaks coinciding with interglacial periods, while cold phases were associated with bottlenecks and secondary contact events. We observed an intergradation zone between the Paraná River and the Chacoan-Pampean biome limit, supported by significant bidirectional gene flow between nuclear groups.</p>\u0000 </section>\u0000 \u0000 <section>\u0000 \u0000 <h3> Main Conclusions</h3>\u0000 \u0000 <p>Our findings highlight the effects of the climatic fluctuations on population dynamics and lineage divergence, the role of the Paraná River as a semipermeable barrier, the Chaco-Pampa ecotone as an environmental barrier, and the influence of sea level changes on lineage isolation and connectivity. The biogeographic pattern and divergence times of <i>L. latinasus</i> are concordant with the diversification of other frogs co-occurring in the CPP.</p>\u0000 </section>\u0000 </div>","PeriodicalId":15299,"journal":{"name":"Journal of Biogeography","volume":"53 1","pages":""},"PeriodicalIF":3.6,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145964145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}
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