Floodplain wetlands such as Poyang Lake are increasingly shaped by hydrological extremes, yet the mechanisms linking hydrology to waterbirds' space use remain unclear. We aimed to quantify species-specific distribution, habitat selection and behavioural plasticity across contrasting hydrological conditions to inform conservation and wetland management.
We integrated satellite tracking of greater white-fronted goose (Anser albifrons), bean goose (A. fabalis) and swan goose (A. cygnoides) with remote sensing and a hydrological classification derived from long-term water levels and the SPEI. Individual winter home ranges and utilisation intensity were estimated, mapped, and linked to habitat types. Space-use metrics were compared across hydrological categories (normal, drought, extreme drought) to assess species-specific selection.
Species differed markedly amongst hydrological years. Greater white-fronted and bean geese had larger home ranges and higher mean utilisation intensity in drought and extreme drought years, whereas swan geese showed the opposite pattern. Hydrology strongly structured habitat selection: differences amongst habitat types were pronounced in normal and drought years but weakened under extreme drought. Fresh, sparse wet meadows dominated in normal and drought years; during extreme drought, use of mudflats and tall sedges increased, with parallel shifts in utilisation intensity.
Wintering geese adjusted home range size, utilisation intensity, and habitat preferences under extreme drought, demonstrating pronounced behavioural plasticity and hydrology-dependent space-use strategies. By elucidating species-specific mechanisms linking hydrology to habitat selection in a dynamic Ramsar wetland, this study advances habitat selection theory for floodplain systems and provides actionable guidance for conserving geese and managing Poyang Lake under increasing hydrological extremes.
{"title":"Hydrological Conditions Mediate Habitat Use Plasticity of Wintering Geese in a Floodplain Wetland","authors":"Shaoxia Xia, Wenjuan Yang, Xiubo Yu, Li Wen","doi":"10.1111/fwb.70171","DOIUrl":"https://doi.org/10.1111/fwb.70171","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Floodplain wetlands such as Poyang Lake are increasingly shaped by hydrological extremes, yet the mechanisms linking hydrology to waterbirds' space use remain unclear. We aimed to quantify species-specific distribution, habitat selection and behavioural plasticity across contrasting hydrological conditions to inform conservation and wetland management.</li>\u0000 \u0000 \u0000 <li>We integrated satellite tracking of greater white-fronted goose (<i>Anser albifrons</i>), bean goose (<i>A. fabalis</i>) and swan goose (<i>A. cygnoides</i>) with remote sensing and a hydrological classification derived from long-term water levels and the SPEI. Individual winter home ranges and utilisation intensity were estimated, mapped, and linked to habitat types. Space-use metrics were compared across hydrological categories (normal, drought, extreme drought) to assess species-specific selection.</li>\u0000 \u0000 \u0000 <li>Species differed markedly amongst hydrological years. Greater white-fronted and bean geese had larger home ranges and higher mean utilisation intensity in drought and extreme drought years, whereas swan geese showed the opposite pattern. Hydrology strongly structured habitat selection: differences amongst habitat types were pronounced in normal and drought years but weakened under extreme drought. Fresh, sparse wet meadows dominated in normal and drought years; during extreme drought, use of mudflats and tall sedges increased, with parallel shifts in utilisation intensity.</li>\u0000 \u0000 \u0000 <li>Wintering geese adjusted home range size, utilisation intensity, and habitat preferences under extreme drought, demonstrating pronounced behavioural plasticity and hydrology-dependent space-use strategies. By elucidating species-specific mechanisms linking hydrology to habitat selection in a dynamic Ramsar wetland, this study advances habitat selection theory for floodplain systems and provides actionable guidance for conserving geese and managing Poyang Lake under increasing hydrological extremes.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146002300","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Joseph Vanderwall, Nellie Little, Hallie Turner, James J. Elser
Nutrient limitation of phytoplankton growth in a lake has various effects on lake function and primary producer composition. There is a rich history of using short-term enrichment experiments to infer the type and degree of limitation in lakes. However, most experiments are analysed independently of one another, lack a common framework for expressing uncertainty, and only represent a single point in time.
We conducted a series of phytoplankton nutrient limitation experiments in mountain lakes across northwestern Montana, USA to (a) assess regional patterns of nutrient limitation and (b) examine limitation through time in one large lake. We use a multilevel Bayesian model to better characterise parameter uncertainty across all experiments.
The fertilisation effect of phosphorus was consistently larger than that of nitrogen, reflecting low phosphorus concentrations across lakes in this region.
Most experiments showed evidence for P limitation or serial P limitation, with some evidence for independent co-limitation as well. We also show that nutrient limitation in one lake changed over both a growing season and across years from strong P limitation to serial P limitation.
Future work should continue to explore methods for analysing collections of nutrient limitation experiments.
{"title":"Patterns of Nutrient Limitation of Phytoplankton in Mountain Lakes Using a Hierarchical Modelling Approach","authors":"Joseph Vanderwall, Nellie Little, Hallie Turner, James J. Elser","doi":"10.1111/fwb.70173","DOIUrl":"https://doi.org/10.1111/fwb.70173","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Nutrient limitation of phytoplankton growth in a lake has various effects on lake function and primary producer composition. There is a rich history of using short-term enrichment experiments to infer the type and degree of limitation in lakes. However, most experiments are analysed independently of one another, lack a common framework for expressing uncertainty, and only represent a single point in time.</li>\u0000 \u0000 \u0000 <li>We conducted a series of phytoplankton nutrient limitation experiments in mountain lakes across northwestern Montana, USA to (a) assess regional patterns of nutrient limitation and (b) examine limitation through time in one large lake. We use a multilevel Bayesian model to better characterise parameter uncertainty across all experiments.</li>\u0000 \u0000 \u0000 <li>The fertilisation effect of phosphorus was consistently larger than that of nitrogen, reflecting low phosphorus concentrations across lakes in this region.</li>\u0000 \u0000 \u0000 <li>Most experiments showed evidence for P limitation or serial P limitation, with some evidence for independent co-limitation as well. We also show that nutrient limitation in one lake changed over both a growing season and across years from strong P limitation to serial P limitation.</li>\u0000 \u0000 \u0000 <li>Future work should continue to explore methods for analysing collections of nutrient limitation experiments.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146002291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Connectivity between rivers and floodplain wetland habitats has potential benefits for native fishes through enhanced movement opportunities for feeding, spawning, and recruitment. In regulated river systems, natural connecting flows may be substantially altered or lost, and in some cases, these connections are controlled by regulators between rivers and wetlands.
In this study, we investigated whether using regulators to improve connectivity between rivers and floodplain wetlands is effective in facilitating the movement of adult fish into wetlands to spawn and the subsequent dispersal of juvenile fish to rivers. We used fyke netting and seining within wetlands (control and impact) to investigate changes in fish catch rates resulting from the provision of lateral connectivity and bi-directional fyke netting in flood runners and creeks (connecting wetlands or wetland complexes with rivers) to investigate the directional movement of Australian Smelt (Retropinna semoni) and Carp Gudgeon (Hypseleotris spp).
The catch rates of adult Australian Smelt increased in wetlands connected to the river during late winter/early spring relative to those that remained disconnected. No difference in catch rates in wetlands was detected for adult Carp Gudgeon. In complex forest flood runners and creeks, adult Australian Smelt moved against the current when connectivity was supplied. No directional movement was detected toward or away from wetlands that were close to the river (i.e., with short connections of < 150 m) where water tended to flow into the wetlands. No directional movement was detected for adult Carp Gudgeon. Where connectivity was available, juveniles of both species dispersed toward the river in large numbers in spring following spawning and recruitment in wetlands.
The current study demonstrates the benefits of managed connectivity between the Murray River and floodplain wetlands (i.e., an increase in the abundance of adult native fish in wetlands prior to their spawning season and large amounts of emigration of juvenile native fish to the Murray River following spawning and recruitment).
These results should be used to create more specific objectives or targets for managed floodplain connectivity in the Murray River system and can be used to support management actions to increase the spatial extent of floodplain connectivity, not only in the current study area but globally.
{"title":"Connectivity Between a River and Floodplain Wetlands Through Regulators Enhances Bidirectional Migration of Two Species of Small-Bodied Fish","authors":"Frank Amtstaetter, Gabriel Cornell","doi":"10.1111/fwb.70162","DOIUrl":"https://doi.org/10.1111/fwb.70162","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Connectivity between rivers and floodplain wetland habitats has potential benefits for native fishes through enhanced movement opportunities for feeding, spawning, and recruitment. In regulated river systems, natural connecting flows may be substantially altered or lost, and in some cases, these connections are controlled by regulators between rivers and wetlands.</li>\u0000 \u0000 \u0000 <li>In this study, we investigated whether using regulators to improve connectivity between rivers and floodplain wetlands is effective in facilitating the movement of adult fish into wetlands to spawn and the subsequent dispersal of juvenile fish to rivers. We used fyke netting and seining within wetlands (control and impact) to investigate changes in fish catch rates resulting from the provision of lateral connectivity and bi-directional fyke netting in flood runners and creeks (connecting wetlands or wetland complexes with rivers) to investigate the directional movement of Australian Smelt (<i>Retropinna semoni</i>) and Carp Gudgeon (<i>Hypseleotris</i> spp).</li>\u0000 \u0000 \u0000 <li>The catch rates of adult Australian Smelt increased in wetlands connected to the river during late winter/early spring relative to those that remained disconnected. No difference in catch rates in wetlands was detected for adult Carp Gudgeon. In complex forest flood runners and creeks, adult Australian Smelt moved against the current when connectivity was supplied. No directional movement was detected toward or away from wetlands that were close to the river (i.e., with short connections of < 150 m) where water tended to flow into the wetlands. No directional movement was detected for adult Carp Gudgeon. Where connectivity was available, juveniles of both species dispersed toward the river in large numbers in spring following spawning and recruitment in wetlands.</li>\u0000 \u0000 \u0000 <li>The current study demonstrates the benefits of managed connectivity between the Murray River and floodplain wetlands (i.e., an increase in the abundance of adult native fish in wetlands prior to their spawning season and large amounts of emigration of juvenile native fish to the Murray River following spawning and recruitment).</li>\u0000 \u0000 \u0000 <li>These results should be used to create more specific objectives or targets for managed floodplain connectivity in the Murray River system and can be used to support management actions to increase the spatial extent of floodplain connectivity, not only in the current study area but globally.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146001998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Potential Effects of Climate Warming on Density-Dependent Growth and Mortality in a Cannibalistic Ectotherm (Sympetrum vulgatum: Odonata)","authors":"Nele Breitkreutz, Frank Johansson","doi":"10.1111/fwb.70168","DOIUrl":"https://doi.org/10.1111/fwb.70168","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70168","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145983835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Liang He, Nana Shi, Shiyuan Guo, Meng Zhang, Bangguo Chen, Xiaole Zhou, Heyun Wang, Xianchuan Xie, Wei Wan, Te Cao, Shu Li, Gang Ge
Submerged aquatic vegetation (SAV) plays a vital role in improving water quality and providing essential habitats for diverse aquatic fauna in floodplain lakes. However, in large floodplain systems, the spatiotemporal dynamics and underlying drivers of SAV remain poorly understood, largely due to monitoring challenges posed by complex topography, highly variable water levels, and diverse vegetation communities.
To address this knowledge gap, we developed a novel remote sensing approach that integrates multi-temporal imagery from the water-level drawdown period with differential submergence responses of wetland vegetation types. This method effectively overcomes detection difficulties under high water levels and minimises interference from inundated emergent vegetation. Applying this approach, we analysed long-term changes in SAV extent in Poyang Lake, the largest floodplain lake in China, and used generalised additive models to identify key environmental drivers, with a particular focus on hydrology and water transparency.
Our results revealed a substantial and persistent collapse of SAV in Poyang Lake, declining from 655 ± 288 km2 during 2001–2009 to 44 ± 31 km2 during 2020–2023, accompanied by reduced variability and slower recovery, indicating a loss of natural dynamic resilience. This collapse was primarily driven by hydrological alterations, including more frequent extreme floods linked to climate change and earlier water-level recession caused by hydraulic engineering and sand mining. Reduced water transparency further intensified SAV losses.
This study enhances understanding of SAV dynamics and their drivers in large, hydrologically complex lakes, while also providing a transferable monitoring framework for other floodplain lakes. These findings offer critical insights for conservation and adaptive management strategies aimed at sustaining these vulnerable ecosystems.
{"title":"Hydrological Alterations Drive Long-Term Decline and Resilience Loss of Submerged Aquatic Vegetation in a Large Floodplain Lake","authors":"Liang He, Nana Shi, Shiyuan Guo, Meng Zhang, Bangguo Chen, Xiaole Zhou, Heyun Wang, Xianchuan Xie, Wei Wan, Te Cao, Shu Li, Gang Ge","doi":"10.1111/fwb.70167","DOIUrl":"https://doi.org/10.1111/fwb.70167","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Submerged aquatic vegetation (SAV) plays a vital role in improving water quality and providing essential habitats for diverse aquatic fauna in floodplain lakes. However, in large floodplain systems, the spatiotemporal dynamics and underlying drivers of SAV remain poorly understood, largely due to monitoring challenges posed by complex topography, highly variable water levels, and diverse vegetation communities.</li>\u0000 \u0000 \u0000 <li>To address this knowledge gap, we developed a novel remote sensing approach that integrates multi-temporal imagery from the water-level drawdown period with differential submergence responses of wetland vegetation types. This method effectively overcomes detection difficulties under high water levels and minimises interference from inundated emergent vegetation. Applying this approach, we analysed long-term changes in SAV extent in Poyang Lake, the largest floodplain lake in China, and used generalised additive models to identify key environmental drivers, with a particular focus on hydrology and water transparency.</li>\u0000 \u0000 \u0000 <li>Our results revealed a substantial and persistent collapse of SAV in Poyang Lake, declining from 655 ± 288 km<sup>2</sup> during 2001–2009 to 44 ± 31 km<sup>2</sup> during 2020–2023, accompanied by reduced variability and slower recovery, indicating a loss of natural dynamic resilience. This collapse was primarily driven by hydrological alterations, including more frequent extreme floods linked to climate change and earlier water-level recession caused by hydraulic engineering and sand mining. Reduced water transparency further intensified SAV losses.</li>\u0000 \u0000 \u0000 <li>This study enhances understanding of SAV dynamics and their drivers in large, hydrologically complex lakes, while also providing a transferable monitoring framework for other floodplain lakes. These findings offer critical insights for conservation and adaptive management strategies aimed at sustaining these vulnerable ecosystems.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145964203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Magnus Lovén Wallerius, Raviv Gal, Martin Österling
{"title":"Ecosystem Engineering by Mussels (Margaritifera margaritifera) Influences the Behaviour of Their Host Fish Brown Trout (Salmo trutta) Under Various Flows","authors":"Magnus Lovén Wallerius, Raviv Gal, Martin Österling","doi":"10.1111/fwb.70169","DOIUrl":"https://doi.org/10.1111/fwb.70169","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70169","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145983519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hunter J. Howell, Sierra N. Thomasset, Leila M. Thompson, Mark I. Cook, Eric A. Cline, Nathan J. Dorn, Christopher A. Searcy
{"title":"Evidence for Asian Swamp Eels as an Emerging Threat to Everglades Amphibians","authors":"Hunter J. Howell, Sierra N. Thomasset, Leila M. Thompson, Mark I. Cook, Eric A. Cline, Nathan J. Dorn, Christopher A. Searcy","doi":"10.1111/fwb.70150","DOIUrl":"https://doi.org/10.1111/fwb.70150","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2026-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70150","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145963799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Maisa Carvalho Vieira, Hugo de Oliveira Barbosa, Ludgero Cardoso Galli Vieira, Carla Albuquerque de Souza, Leonardo Beserra da Silva, Luis Mauricio Bini
{"title":"Temporal Beta Diversity of Local Zooplankton Communities in Small Reservoirs is Associated With Hydrological Seasonality","authors":"Maisa Carvalho Vieira, Hugo de Oliveira Barbosa, Ludgero Cardoso Galli Vieira, Carla Albuquerque de Souza, Leonardo Beserra da Silva, Luis Mauricio Bini","doi":"10.1111/fwb.70158","DOIUrl":"https://doi.org/10.1111/fwb.70158","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70158","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Issue Information - Cover and Ed Board","authors":"","doi":"10.1111/fwb.70159","DOIUrl":"https://doi.org/10.1111/fwb.70159","url":null,"abstract":"","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70159","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145891019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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