Freshwater Biology最新文献

{"title":"Trophic Usability, Not Carbon Supply, Constrains Energy Transfer in Eutrophic Food Webs","authors":"Hua Song,&nbsp;Fen Guo,&nbsp;David Dudgeon,&nbsp;Hui Jin,&nbsp;Zhenmin Yang,&nbsp;Feilong Li,&nbsp;Yuan Zhang","doi":"10.1111/fwb.70320","DOIUrl":"https://doi.org/10.1111/fwb.70320","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Trophic transfer efficiency (TTE) is commonly quantified from carbon fluxes, implicitly assuming that primary production is uniformly available to consumers. This assumption fails in many eutrophic lakes, where high phytoplankton biomass and carbon production coexist with weak secondary production, a paradox that carbon-centred frameworks have recognized but not mechanistically resolved.</li>\u0000 \u0000 \u0000 <li>Here, we propose that this mismatch may arise because trophic transfer is constrained not simply by production quantity, but by trophic usability. We applied a dual-currency framework to examine phytoplankton-to-zooplankton transfer in more and less eutrophic regions of two subtropical lakes. Transfer was quantified using bulk carbon and ω3 long-chain polyunsaturated fatty acids (ω3 LC-PUFA), together with information on plankton community composition and inferred trophic-network structure.</li>\u0000 \u0000 \u0000 <li>Our results show that the more eutrophic regions had higher phytoplankton carbon production and stronger cyanobacterial dominance, whereas the less eutrophic regions had higher phytoplankton ω3 LC-PUFA production and greater contributions of diatoms and cryptophytes. These contrasts coincided with higher zooplankton carbon and ω3 LC-PUFA production and higher TTE in the less eutrophic regions.</li>\u0000 \u0000 \u0000 <li>ω3 LC-PUFA-based TTE was generally higher than carbon-based TTE, although the difference was not statistically significant in every regional comparison. This metric is therefore best interpreted as a quality-weighted transfer and retention measure reflecting both trophic routing and selective biochemical conservation. Exploratory networks based on observed taxa contained more inferred links in the less eutrophic regions, consistent with regional differences in plankton community structure.</li>\u0000 \u0000 \u0000 <li>These findings support the view that trophic transfer in eutrophic lakes is associated with the quantity and biochemical quality of primary production, plankton community composition, and selective retention of essential molecules. Although based on a two-lake, single-season correlative comparison, the dual-currency framework provides a complementary approach for evaluating how eutrophication-related changes in basal resources are linked to consumer production and trophic transfer.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149205488","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":"Long-Term Fish Assemblage Responses to Instream Restoration in Boreal Streams: Insights From a 24-Year BACI Study","authors":"Teppo Vehanen,&nbsp;Ari Huusko,&nbsp;Aki Mäki-Petäys,&nbsp;Timo Muotka,&nbsp;Pauliina Louhi","doi":"10.1111/fwb.70318","DOIUrl":"https://doi.org/10.1111/fwb.70318","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70318","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146428","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":"Month-To-Month Variability in δ13C and δ18O Signatures of Charophyte Carbonate Encrustations Across Growing Season","authors":"Eugeniusz Pronin,&nbsp;Karina Apolinarska,&nbsp;Mariusz Pełechaty","doi":"10.1111/fwb.70317","DOIUrl":"https://doi.org/10.1111/fwb.70317","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;This study examines the relationships between the &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C and &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O signatures of extant charophyte carbonates (&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C&lt;sub&gt;CARB&lt;/sub&gt; and &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;CARB&lt;/sub&gt;) and those of dissolved inorganic carbon and ambient water (&lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C&lt;sub&gt;DIC&lt;/sub&gt; and &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;WATER&lt;/sub&gt;, respectively), while explicitly incorporating monthly data collected from June to September 2008. By integrating this temporal resolution, the analysis captures month-to-month variability and enables a more robust assessment of inter- and intraspecific differences, lake-specific variability and the influence of charophyte bed structure and ambient physico-chemical water properties on isotopic composition.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;Four charophyte species (&lt;i&gt;Nitellopsis obtusa&lt;/i&gt;, &lt;i&gt;Chara tomentosa&lt;/i&gt;, &lt;i&gt;Chara rudis&lt;/i&gt; (syn. &lt;i&gt;C. subspinosa&lt;/i&gt;), &lt;i&gt;Chara contraria&lt;/i&gt;) were studied in four Central European charophyte-dominated lakes (&lt;i&gt;Chara&lt;/i&gt;-lakes). Monthly sampling (June–September 2008) was conducted at permanent study sites (charophyte beds), where charophytes and overlying water were collected, along with three pelagic macrophyte-free sites per lake for comparison.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;The analyses revealed clear month-to-month shifts in both &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C and &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O values across species and lakes. The &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C&lt;sub&gt;DIC&lt;/sub&gt; and &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C&lt;sub&gt;CARB&lt;/sub&gt; values increased from June to August and slightly declined in September, while &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;CARB&lt;/sub&gt; showed distinct interspecific differences and lake-dependent patterns throughout the season. Interspecific contrasts were most pronounced during mid-summer.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;Linear mixed-effects models further showed that both environmental isotopic composition and species significantly influenced carbonate isotope signatures; &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C&lt;sub&gt;CARB&lt;/sub&gt; was related to &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C&lt;sub&gt;DIC&lt;/sub&gt;, whereas &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;CARB&lt;/sub&gt; was dependent on &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;18&lt;/sup&gt;O&lt;sub&gt;WATER&lt;/sub&gt; after accounting for lake-specific variability. Species remained significant in both models, indicating that charophyte carbonate encrustations record not only seasonal environmental change but also species-specific physiological and ecological processes.&lt;/li&gt;\u0000 \u0000 \u0000 &lt;li&gt;These findings demonstrate that charophyte carbonates capture high-resolution seasonal changes in water chemistry and species-specific carbon acquisition. Increasing &lt;i&gt;δ&lt;/i&gt;&lt;sup&gt;13&lt;/sup&gt;C values during summer are consistent with intensified photosynthetic activity, progressive CO&lt;sub&gt;2&lt;/sub&gt; limitation and enhanced HCO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;−&lt;/sup&gt; use, whereas variations in &lt;i&gt;δ&lt;/","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146266","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":"Do Trematode Parasites Alter Competitive Interactions Between Snail and Anuran Hosts in Aquatic Systems?","authors":"Miranda L. Strasburg,&nbsp;Michelle D. Boone","doi":"10.1111/fwb.70316","DOIUrl":"https://doi.org/10.1111/fwb.70316","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Studies of food webs in aquatic communities rarely include parasites, despite growing evidence of their widespread effects on community composition. Parasites, including trematodes, can alter food webs by directly impacting their hosts and by influencing interactions between their hosts and other community members. Many parasitic trematodes require both aquatic snail and larval amphibian hosts, species that compete for algal resources.</li>\u0000 \u0000 \u0000 <li>To understand how parasitism and competition alter communities, we manipulated trematode (<i>Echinostoma</i> spp.) presence, and the presence and abundance of two potential hosts and competitors—northern leopard frog (<i>Lithobates pipiens</i>) tadpoles and ram's horn snail (<i>Planorbella [Helisoma] trivolvis</i>) in aquatic mesocosm communities.</li>\u0000 \u0000 \u0000 <li>We found that tadpole presence, rather than parasite presence, had the strongest effects of all treatments on the community by influencing algal and zooplankton abundance. Both parasites and snail competitors, however, impacted tadpole survival to metamorphosis in a way that suggested the species interaction between parasites and snails offset the impact on tadpoles. Conversely, tadpole presence did not influence snail responses, suggesting the competition between northern leopard frog tadpoles and snails was asymmetrical at the densities in the study.</li>\u0000 \u0000 \u0000 <li>This study demonstrated that tadpole primary consumers, rather than parasites, play a greater role in the structure of aquatic communities and that environmental factors that influence the abundance of larval amphibians could have widespread effects on food webs.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145930","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":"Gems of the Middle-East: Unravelling the Biodiversity of Monogonont Rotifers in Temporary and Semi-Perennial Freshwater Habitats Across Israel","authors":"Ofir Hirshberg,&nbsp;Sofia Paraskevopoulou,&nbsp;Katrin Kiemel,&nbsp;Frida Ben-Ami","doi":"10.1111/fwb.70302","DOIUrl":"https://doi.org/10.1111/fwb.70302","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70302","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146013","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":"Taxonomy-Independent eDNA Approaches in Groundwaters: A Prospective Tool for Improved Ecological Assessments","authors":"Jake Thornhill,&nbsp;Nicole E. White,&nbsp;Kathryn L. Korbel,&nbsp;Mattia Saccò,&nbsp;Michelle T. Guzik","doi":"10.1111/fwb.70312","DOIUrl":"https://doi.org/10.1111/fwb.70312","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70312","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145602","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":"Concentration-Dependent Sulphate Enrichment Restructures Microbial Communities and Associated Sulphur–Iron–Nitrogen Dynamics in Freshwater Sediments","authors":"Mandar Bandekar,&nbsp;Kuldeep D. More,&nbsp;Carlos Palacin-Lizarbe,&nbsp;Jukka Kekäläinen,&nbsp;Jarkko Akkanen","doi":"10.1111/fwb.70315","DOIUrl":"https://doi.org/10.1111/fwb.70315","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Sulphate input from industrial discharge, mining, and agricultural runoff can significantly alter biogeochemical functions in freshwater systems. However, the concentration- and time-dependent effects of sulphate on geochemistry and microbial communities of lake sediments remain insufficiently characterized.</li>\u0000 \u0000 \u0000 <li>Here, we incubated lake sediment microcosms amended with 1, 5, and 10 mM sulphate under suboxic conditions for 45 days and monitored geochemical and microbial community changes.</li>\u0000 \u0000 \u0000 <li>Sulphate enrichment induced distinct, dose- and time-responsive changes. Nitrate increased progressively with sulphate concentration (10 &gt; 5 &gt; 1 mM), reflecting treatment-specific shifts in nitrogen dynamics under changing redox conditions within sedimentary nitrogen pools. Microbial diversity declined initially across sulphate treatments, peaked at 5 mM, and remained suppressed at 10 mM.</li>\u0000 \u0000 \u0000 <li>Dominant taxa shifted from <i>Geobacter</i> spp. at 1 mM to <i>Citrifermentans</i> spp. and <i>Sulfurospirillum</i> spp. at 10 mM, reflecting redistribution of electron flow among competing iron, sulphur, and nitrogen associated metabolisms at higher sulphate concentrations. Functional predictions suggested enhanced iron respiration at lower sulphate (1 mM), whereas higher concentrations were associated with increased chemoheterotrophy and fermentation, alongside suppression of methanogenesis.</li>\u0000 \u0000 \u0000 <li>Our findings demonstrate that increasing sulphate inputs restructure sedimentary microbial networks and reconfigure redox-linked carbon and nitrogen cycling, suggesting ecosystem-level biogeochemical responses to rising sulphate stress in freshwater catchments.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145608","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":"Scale Invariant Patterns of Life History Strategies of Riverine Mussels Are Shaped by Hydrological Factors","authors":"Zachary A. Mitchell,&nbsp;Astrid N. Schwalb","doi":"10.1111/fwb.70314","DOIUrl":"https://doi.org/10.1111/fwb.70314","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70314","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068115","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.70241","DOIUrl":"https://doi.org/10.1111/fwb.70241","url":null,"abstract":"","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70241","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068186","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":"Hydrologic, Plant and Soil Controls on Microbial Biomass and Enzyme Activities in a Natural and a Restored Freshwater Marsh of Eastern Ontario, Canada","authors":"Dan Dong,&nbsp;Cynthia M. Kallenbach,&nbsp;Tim R. Moore","doi":"10.1111/fwb.70313","DOIUrl":"https://doi.org/10.1111/fwb.70313","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"71 10","pages":""},"PeriodicalIF":2.6,"publicationDate":"2026-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70313","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149068187","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}