Freshwater Biology最新文献

{"title":"Functional and Taxonomic Responses of Fish Assemblages to Low-Head Dam Removals","authors":"Katherine A. Adase, Caroline C. Arantes, Brent A. Murry, David I. Wellman Jr., Dustin M. Smith","doi":"10.1111/fwb.70030","DOIUrl":"https://doi.org/10.1111/fwb.70030","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Low-head dams are widespread in river ecosystems around the globe, but due to their effects, removals have become a major mechanism for river restoration. Investigations of fish responses to dam removals have been mostly conducted in the short term and have shown mixed assemblage responses (e.g., increased or decreased species richness following removal). Here, we examined the effects of low-head dam removals on taxonomic composition and functional diversity at a relatively long term (6 years post dam removal). We hypothesised that differential responses of fish assemblages to dam removal are driven by suites of guild and morphological traits and that removal impacts functional complexity, with free-flowing sites having greater distributions of functional diversity than impounded sites.</li>\u0000 \u0000 \u0000 <li>We conducted our study in the West Fork River, West Virginia, where three low-head dams were removed in 2016. Boat electrofishing surveys were conducted 1 year before the removal (2015) focusing on species of recreational fisheries importance. Then, we conducted surveys in the same sites 6 years after the removal (between September and October 2022). These electrofishing surveys were conducted at sites that were previously impounded but are now free-flowing and those that currently remain impounded by low-head dams.</li>\u0000 \u0000 \u0000 <li>Results from our univariate and multivariate analyses indicated that current impounded sites and free-flowing sites have statistically distinct taxonomic and functional fish assemblages. Free-flowing sites were associated with overall higher taxonomic richness and greater biomass of some recreationally important species, including muskellunge, smallmouth bass and channel catfish. Conversely, currently impounded sites were associated with lower taxonomic richness and greater biomass of some recreationally important fishes, including green sunfish, bluegill and largemouth bass. Furthermore, functional diversity indices showed high functional richness (FRic) at free-flowing sites, while less evident changes were observed for functional evenness (FEve) and functional divergence (FDiv).</li>\u0000 \u0000 \u0000 <li>Our findings suggest that long-term changes in the fish assemblages following the dam removals led to greater taxonomic and functional diversity while maintaining fisheries of high recreational importance. While some previous short-term assessments suggested decreased functional complexity shortly after removals, our results suggest increases in functional complexity in the long term. Though dam removals may have high upfront socioeconomic costs, the long-term effects in this study appeared to lead to greater ecosystem function and enhanced recreational opportunities that may outweigh initial costs.</li>\u0000 </ol>\u0000 \u0000 ","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143849038","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":"Historic Human-Induced Species Shift Increases Climate Sensitivity of Today’s Western European Floodplain Forests: Restoring Past Conditions for Future Resilience","authors":"Eleonora Saccon,&nbsp;Johan van de Koppel,&nbsp;Willem Bekhuis,&nbsp;Suzanne J. M. H. Hulscher,&nbsp;Tjeerd J. Bouma","doi":"10.1111/fwb.70034","DOIUrl":"https://doi.org/10.1111/fwb.70034","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70034","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143831361","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":"The Influence of Catchment Characteristics and Water Chemistry on Invertebrate Community Composition in Ponds and Lakes in Subarctic Alaska","authors":"Amy S. Larsen,&nbsp;Michael Cole,&nbsp;Danielle L. Rupp,&nbsp;Trey Simmons","doi":"10.1111/fwb.70024","DOIUrl":"https://doi.org/10.1111/fwb.70024","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70024","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818598","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":"Minimal Introgression but Restricted Gene Flow: How Stocking and Dams Influence Wild Brook Trout (Salvelinus fontinalis) Genetics and Morphology","authors":"Sozos N. Michaelides,&nbsp;Corey Pelletier,&nbsp;Ciara J. Frawley,&nbsp;Graham Forrester,&nbsp;Alan Libby,&nbsp;Thomas McGreevy Jr","doi":"10.1111/fwb.70033","DOIUrl":"https://doi.org/10.1111/fwb.70033","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70033","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143818597","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":"Functional and Taxonomic Diversity is Associated With Resource Use Efficiency in Epilithic Algae of Subtropical Qinhuai River, China","authors":"Beryl Ochieng,&nbsp;Ming Chen,&nbsp;Abonyi András,&nbsp;Song Bai,&nbsp;Yifan Cui,&nbsp;Jinfu Liu,&nbsp;Peixuan Zhang,&nbsp;Jing Hu,&nbsp;Shun Zhou,&nbsp;Jianjun Wang","doi":"10.1111/fwb.70029","DOIUrl":"https://doi.org/10.1111/fwb.70029","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>The effects of biodiversity on ecosystem functioning comprise a central ecological theorem (BEF), because more diverse communities are expected to perform better, for example, in terms of resource use efficiency (RUE). Although biodiversity affects ecosystem functioning, it is seriously constrained by global environmental change. Epilithic algae are a crucial benthic functional group in aquatic food webs, but the effect of their biodiversity on ecosystem functioning is yet to be understood.</li>\u0000 \u0000 \u0000 <li>Here, we compared the capacity of taxonomic versus functional richness and evenness to predict RUE in a dataset on epilithic algae from the Qinhuai River, Nanjing, China. We examined associations between environmental variables and taxonomic and functional diversity (response and ecological indication), and assessed whether taxonomic and functional diversity measures predicted RUE (quantified as total algal biomass standardised by total phosphorus (RUE_TP), and total nitrogen (RUE_TN)).</li>\u0000 \u0000 \u0000 <li>Taxonomic and functional diversity varied more across seasons than space, peaking in spring and summer in association with pronounced environmental changes. Water temperature and nutrient concentrations positively and significantly predicted taxonomic and functional diversity measures. Taxonomic and functional richness positively associated with RUE, while functional evenness negatively associated. However, taxonomic evenness was not related to RUE. Structural equation modelling showed that taxonomic and functional diversity were positively associated with RUE_TP and RUE_TN. However, taxonomic diversity was more strongly predictive of RUE than functional diversity.</li>\u0000 \u0000 \u0000 <li>Our results suggest that RUE is closely linked to species diversity, and functional diversity provides a complementary approach for better understanding of mechanisms underlying the BEF relationship for benthic algae in large rivers.</li>\u0000 \u0000 \u0000 <li>We suggest using taxonomic and functional approaches in a complementary way to gain a deeper understanding of the interplay among environmental factors, community diversity and ecosystem functioning.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809747","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":"Waterfowl Endozoochory: Traits Drive Plant–Bird Dispersal Interactions in North America","authors":"Bia A. Almeida,&nbsp;Giliandro G. Silva,&nbsp;Mihai Costea,&nbsp;Leonardo Maltchik,&nbsp;Susan E. W. De La Cruz,&nbsp;John Y. Takekawa,&nbsp;Andy J. Green","doi":"10.1111/fwb.70027","DOIUrl":"https://doi.org/10.1111/fwb.70027","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;\u0000 \u0000 &lt;/p&gt;&lt;ol&gt;\u0000 \u0000 \u0000 &lt;li&gt;Plant biogeography and ongoing changes in plant distributions are influenced by long-distance dispersal (LDD) of seeds, and migratory waterfowl (Anatidae: Ducks, geese and swans) are particularly important for the dispersal of plants in and around wetlands through gut passage (endozoochory). However, this dispersal is not contemplated by classical dispersal syndromes; hence, currently we have limited understanding of what angiosperm traits predict seed dispersal by waterfowl and any differences due to avian trait variation among waterfowl species.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;We conducted a literature search for data on the presence of seeds in the alimentary canal or faeces of North American waterfowl as a proxy for dispersal interactions, since an important fraction of these seeds survives gut passage. We present a list of North American flowering plant species (&lt;i&gt;N&lt;/i&gt; = 536) from 95 families potentially dispersed by 38 waterfowl species, together with traits of these plants and their vectors. Owing largely to limited sampling effort, 47% of plant species and 35% of plant genera recorded were only found in a single waterfowl species.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;A suite of analytical approaches revealed major differences in the traits of plants whose seeds are ingested and likely dispersed between foraging groups (guilds) and in relation to other waterfowl traits. Diving ducks and sea ducks are associated with sublittoral plants that have submerged or floating leaves, and hence with the classical hydrochory syndrome. Dabbling ducks and herbivorous waterfowl (notably geese) are associated with terrestrial herbaceous plants, and also with the unspecialised dispersal syndrome common in terrestrial plants. Plants with larger seeds or of greater height are more likely to be dispersed by dabbling ducks, whereas shorter plants are more likely to be dispersed by geese than by other waterfowl.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;Network analyses of interactions between waterfowl species and plant traits were generally consistent with these results, but also provided evidence that not all geese, dabbling ducks, or sea duck species are alike in their interactions with plants along the terrestrial–aquatic gradient, but instead occupy distinct dispersal niches. The traditional classification of waterfowl into guilds therefore does not accurately reflect their differing roles in the ingestion and dispersal of plant seeds. Aquatic plant species had more vector species than terrestrial ones.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;Detailed studies of waterfowl endozoochory and more trait determinations for North American plants are needed to facilitate predictions of LDD as waterfowl population sizes and migration patterns vary in the future with climate change.&lt;/li&gt;\u0000 &lt;/ol&gt;\u0000 \u0000 &lt;/di","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143787266","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":"Ephemeral Wetland Macroinvertebrate Communities Across Climate Regions Share Similar Functional Trait Composition Despite Near-Total Taxa Replacement","authors":"Christopher F. Frazier,&nbsp;Andrew T. Karlin,&nbsp;Wiebke J. Boeing,&nbsp;Elizabeth Brock,&nbsp;Jacob Buchanan,&nbsp;J. Derek Hogan,&nbsp;Kevin E. McCluney,&nbsp;Christopher J. Patrick,&nbsp;James H. Thorp","doi":"10.1111/fwb.70028","DOIUrl":"https://doi.org/10.1111/fwb.70028","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Community assembly in aquatic habitats is heavily influenced by hydrology, but understanding the influence of other habitat conditions is also critical. Most studies focus on comparisons of geographically close communities that exist under diverse hydrological regimes, but this framework limits our ability to understand how conditions other than hydrology shape ephemeral wetland communities. Here, we investigated how macroinvertebrate communities vary with local, landscape, and climate variables in ephemeral wetlands across a large geographic range with few geographic barriers.</li>\u0000 \u0000 \u0000 <li>We sampled ephemeral wetlands in North Dakota, New Mexico, and Texas (USA) in 2021 and in North Dakota and New Mexico in 2022. We used an array of hydrographic, climate, landscape, and spatial variables to relate taxonomic and functional macroinvertebrate community composition and diversity to habitat conditions.</li>\u0000 \u0000 \u0000 <li>Taxonomic composition was overwhelmingly different among states and between years: landscape-scale refuge availability explained variation in taxonomic composition, but local and climate-scale variables only explained variation within the context of other variables. Trait composition was similar between most sampling groups, but distinct trait assemblages occurred in the North Dakota 2021 communities. No predictor variable matrix explained trait composition alone, but local, climate, landscape, and spatial arrangement predicted composition when considering the overlapping influence of other variables. Taxa and trait diversity indices were associated with increased refuge habitat at landscape scale.</li>\u0000 \u0000 \u0000 <li>Our results show consistent trait structure across a large geographical scale in hydrologically similar wetlands, despite almost complete taxonomic turnover between regions. Patterns in taxonomic and functional composition imply that incorporating predictor variables at multiple scales is critical in understanding ephemeral wetland community composition.</li>\u0000 \u0000 \u0000 <li>Despite similar hydrological regimes and potential for connectivity via dispersal, taxa replacement is high in ephemeral wetlands across regions within a single grassland macrosystem. Taxonomic composition and overall diversity change with the context provided by a diverse suite of structuring variables. Further, we show that in most cases, ephemeral hydrology elicits a similar trait response across climate regions.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770161","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":"Asian Loaches: An Emerging Threat as Global Invaders","authors":"Carlos Cano-Barbacil,&nbsp;Phillip J. Haubrock,&nbsp;Johannes Radinger","doi":"10.1111/fwb.70026","DOIUrl":"https://doi.org/10.1111/fwb.70026","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70026","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143770162","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":"Freshwater Macroinvertebrate Community Responses to Drying Reflect Abiotic Stress, Frequency of Prior Drying and Proximity to a Perennial Reach","authors":"Elysia B. Harcombe,&nbsp;Angus R. McIntosh,&nbsp;Helen J. Warburton","doi":"10.1111/fwb.70032","DOIUrl":"https://doi.org/10.1111/fwb.70032","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70032","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143762123","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":"A Run-of-River Mega-Dam in the Largest Amazon Tributary Changed the Diversity Pattern of Planktonic Communities and Caused the Loss of Species","authors":"Alfonso Pineda,&nbsp;Óscar Peláez,&nbsp;Luiz Felipe Machado Velho,&nbsp;Priscilla de Carvalho,&nbsp;Luzia C. Rodrigues","doi":"10.1111/fwb.70025","DOIUrl":"https://doi.org/10.1111/fwb.70025","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Run-of-river dams (RORs) are often considered less environmentally damaging than storage dams, but information on their impact on regional biodiversity is scarce. In particular, the effects of RORs on species commonness are largely unknown. In this study, we assessed the impacts of ROR on the biodiversity of phytoplankton and zooplankton in the largest tributary of the Amazon River. We investigated the effects of the ROR on changes in environmental heterogeneity, species richness and beta diversity and examined whether these changes varied with species commonness.</li>\u0000 \u0000 \u0000 <li>We examined the shift in species composition and environmental heterogeneity between damming phases and assessed changes in species richness for the whole community (q0), more abundant species (q2) and typical species (q1—a community without rare and more abundant species). We also decomposed the total diversity (γ) registered at each phase into its local diversity (α) and its spatial (β1—variation among sites) and temporal (β2—variation between samplings and β3—variation between seasons) components. We then evaluated whether the contributions of these components varied with damming for q0, q1 and q2.</li>\u0000 \u0000 \u0000 <li>After damming, the environmental heterogeneity and the richness of both communities decreased (considering the whole community). Beta diversity decreased for phytoplankton and increased for zooplankton. Changes in the contribution of γ components after damming were more evident for typical and more abundant species. For phytoplankton, β1 and β3 decreased while the importance of α increased. For zooplankton, while β1 and β3 increased, α decreased.</li>\u0000 \u0000 \u0000 <li>We showed that analysing the commonness of species could be useful for understanding the impact of ROR. On the one hand, if the interest is in evaluating the response of communities in terms of species number, researchers could consider the whole community. On the other hand, if the interest is in evaluating changes in spatial and temporal patterns, typical and more abundant species appear to be more sensitive than the whole community.</li>\u0000 \u0000 \u0000 <li>Our findings showed changes in diversity patterns and species loss after damming, suggesting that RORs are not as friendly as expected, at least for plankton. Our findings contribute to the evaluation and monitoring strategies for existing dams and those that will be built in the Amazon region in coming years.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 4","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143749426","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}