Freshwater Biology最新文献

{"title":"Hungry Catfish—Effect of Prey Availability on Movement Dynamics of a Top Predator","authors":"Milan Říha,&nbsp;Rubén Rabaneda-Bueno,&nbsp;Lukáš Vejřík,&nbsp;Ivan Jarić,&nbsp;Marie Prchalová,&nbsp;Marek Šmejkal,&nbsp;Martin Čech,&nbsp;Vladislav Draštík,&nbsp;Petr Blabolil,&nbsp;Michaela Holubová,&nbsp;Tomáš Jůza,&nbsp;Karl Ø. Gjelland,&nbsp;Zuzana Sajdlová,&nbsp;Luboš Kočvara,&nbsp;Michal Tušer,&nbsp;Jiří Peterka","doi":"10.1111/fwb.70017","DOIUrl":"https://doi.org/10.1111/fwb.70017","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70017","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554513","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.14268","DOIUrl":"https://doi.org/10.1111/fwb.14268","url":null,"abstract":"","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 3","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-03-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.14268","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143535737","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":"Drought-Induced Decreases in Abundance of Emergent Midge Subsidies Are Offset by Increased Body Size in a Prairie Stream","authors":"Adam C. Siders,&nbsp;Garrett W. Hopper,&nbsp;Matt R. Whiles,&nbsp;Alexander J. Reisinger,&nbsp;Keith B. Gido","doi":"10.1111/fwb.70011","DOIUrl":"https://doi.org/10.1111/fwb.70011","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Emerging aquatic insects can be an important resource subsidy for a variety of terrestrial consumers, including spiders, birds, bats and lizards. Emergence flux is influenced by a variety of abiotic and biotic variables, such as temperature, drying, and predators and these variables can also control the body size of emergent insects. Despite their importance, these variables can change rapidly during drought conditions as water temperatures rise, surface area decreases and predator densities increase.</li>\u0000 \u0000 \u0000 <li>During 2018, the Konza Prairie Biological Station experienced a record drought: flow ceased in the lower reaches of Kings Creek for the first time in over 40 years of observation, leaving a series of isolated pools. We studied how the drought affected aquatic insect emergence in 12 of these pools via elevated temperatures, decreased surface area, and concentration of predators (e.g. fishes and crayfish) over a four-week period. We returned in 2020 and sampled emergence in the same pools over 2 weeks under non-drought conditions to compare emergence between drought and non-drought conditions.</li>\u0000 \u0000 \u0000 <li>We found three overall patterns: (1) rates of areal emergence abundance and biomass (number or mg DM m⁻² d⁻¹) did not differ between drought and non-drought conditions. In contrast, pool-scale emergence abundance, but not biomass (number or mg DM pool⁻¹ d⁻¹), was lower during drought conditions; (2) average midge body size was larger during the drought relative to the non-drought conditions; (3) environmental variables (e.g. temperature, pool surface area, predator biomass) were not predictive of emergence during drought and non-drought conditions.</li>\u0000 \u0000 \u0000 <li>Fewer, but larger emergent midges (as seen under drought conditions) may represent a higher quality resource for terrestrial consumers than many smaller midges due to increased per-capita energy yield. However, due to the overall decrease in water availability throughout the stream network, the overall emergence flux was concentrated in reaches with remaining water during the drought, making pools emergence subsidy hotspots. Overall, these contrasting responses underscore the complex nature of community responses to shifting climatic conditions.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471918","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":"Effects of Wildfire on Interactions Among Nematode Parasites, Mayfly Hosts and Trout Predators","authors":"Emma C. Svatos,&nbsp;Fernando R. Carvallo,&nbsp;Mia K. ter Kuile-Miller,&nbsp;Julia L. Gray,&nbsp;Jordan L. Trujillo,&nbsp;Sara B. Weinstein,&nbsp;Matthew P. Fairchild,&nbsp;Yoichiro Kanno,&nbsp;Daniel L. Preston","doi":"10.1111/fwb.70015","DOIUrl":"https://doi.org/10.1111/fwb.70015","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Wildfire activity is increasing globally, highlighting the need to understand how fire disturbance affects species interactions. In particular, few studies have examined how fire influences interactions among parasites, hosts and predators in freshwater streams.</li>\u0000 \u0000 \u0000 <li>We characterised host–parasite and parasite–predator interactions involving nematode parasites (Family Mermithidae), mayfly hosts (Order Ephemeroptera) and trout predators (<i>Salvelinus fontinalis, Salmo trutta</i> and <i>Oncorhynchus clarkii</i>) at 8 burned and 8 unburned stream sites in the southern Rocky Mountains for 2 years following severe wildfires.</li>\u0000 \u0000 \u0000 <li>Mayfly density, infection probability, and density of infected mayflies (infected mayflies/m²) were all lower at burned sites 1 year after fire but returned to levels similar to unburned sites after 2 years. Density of infected mayflies increased with overall mayfly density; however, infection prevalence (%) ranged from 0% to 26% across burned and unburned streams, and there was no relationship between mayfly density and infection prevalence.</li>\u0000 \u0000 \u0000 <li>Based on dissections of &gt; 20,000 mayflies, intermediate-size (4–6 mm) mayflies in the family Baetidae had the highest infection probability and were also the most common mayfly family and size class found in trout stomachs. Wildfire did not affect the number of mermithids consumed per trout, and infection prevalences of mayflies consumed by trout were significantly lower than in the benthos, suggesting predator-avoidance behaviour by infected mayflies.</li>\u0000 \u0000 \u0000 <li>Overall, our results suggest that mermithid nematode responses to fire reflected changes in host density, consistent with the single-host life cycle of mermithids. These results help integrate host–parasite–predator interactions into our understanding of disturbance ecology in freshwater streams, with implications for parasite roles in energy flow through food webs.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471917","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":"Phytoplankton Community Stability Across Eutrophic Gradients: Insights From Annual and Monthly Timescales","authors":"Wang Liya,&nbsp;Yang Zhen,&nbsp;Shi Limei,&nbsp;Yu Yang,&nbsp;Shi Xiaoli,&nbsp;Zhang Min","doi":"10.1111/fwb.70009","DOIUrl":"https://doi.org/10.1111/fwb.70009","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Exploring the response of natural community stability to anthropogenic environmental changes, such as eutrophication, is an important topic in current ecological research. Eutrophication directly affects species dynamics, abundance and succession in phytoplankton communities, potentially leading to shifts in ecological processes in these communities over multiple years. However, it remains unclear how the annual and monthly dynamics of phytoplankton communities shift along eutrophication gradients to maintain stability.</li>\u0000 \u0000 \u0000 <li>We conducted an 8-year survey in a large shallow lake, where the entire area exhibited a gradient of eutrophication. Using this dataset, we analysed three dynamic characteristics of phytoplankton communities: biomass stability (BS), composition stability (CS) and species rank-abundance curve change (Curve_change). These variables were analysed at annual (from 2014 to 2021, with annual data collected at each sampling site) and monthly (extending to 96 months within the same period, with monthly data) scales to examine how they changed in response to the eutrophication gradient.</li>\u0000 \u0000 \u0000 <li>Annual and monthly BS was only slightly affected by the eutrophication gradient, whereas monthly composition stability and changes in species rank-abundance curves were significantly altered. BS correlated positively with CS but negatively with changes in the species rank-abundance curve.</li>\u0000 \u0000 \u0000 <li>This indicates that phytoplankton can maintain BS through specific adjustments in community structure over shorter timescales, with distinct mechanisms operating across the eutrophication gradient. At high nutrient concentrations, this stability is associated with shifts in the relative abundance of non-dominant species, which buffer fluctuations in dominant species abundances and ensure functional redundancy. In contrast, at relatively low-nutrient concentrations, BS is achieved through compensatory dynamics among dominant species, where declines in one species are offset by increases in another with similar ecological functions. However, this internal regulatory mechanism is less evident over longer timescales.</li>\u0000 \u0000 \u0000 <li>These findings highlight the importance of timescales in studying the impact of eutrophication on phytoplankton community stability, providing important clues for assessing and predicting the response of lake ecosystems to future environmental changes.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471916","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":"Secondary Dispersal of Wetland Plants by Neotropical Otters","authors":"Pedro Hoffmann,&nbsp;Andressa Adolfo,&nbsp;Andy J. Green,&nbsp;Leonardo Maltchik","doi":"10.1111/fwb.70013","DOIUrl":"https://doi.org/10.1111/fwb.70013","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 <li>Carnivorous mammals can disperse seeds and other plant propagules through gut passage (endozoochory). Otters are semiaquatic mustelids and opportunistic carnivores that prey on various vertebrates, and their feeding habits can lead to secondary dispersal of plant propagules. However, this secondary dispersal by otters has not previously been investigated. Here, we investigated the internal dispersal of plants by neotropical otters, \u0000 <i>Lontra longicaudis</i>\u0000 , in southern Brazil.</li>\u0000 \u0000 <li>We collected 31 faecal samples (spraints) from neotropical otters at a Brazilian Ramsar site of the Pampa biome during the wet season of 2022. Intact propagules were separated from each spraint, identified, and their germinability tested where possible. The classes of vertebrate preyed upon in each spraint were identified. We investigated the effects of these prey classes and of spraint mass on the taxonomic richness and abundance of propagules of plants associated with aquatic and/or terrestrial substrates.</li>\u0000 \u0000 <li>We recorded 1206 propagules belonging to 33 plant taxa (one charophyte, four pteridophytes, and 28 angiosperms), representing 18 plant families and including 20 strictly aquatic macrophytes. Seeds from six angiosperm taxa were germinated, with a low overall germination rate of 2%. All spraints contained fish, while 10 also contained remains of reptiles, amphibians, and/or mammals. The taxonomic richness of propagules was positively correlated with spraint weight. Propagule abundance depended on both spraint weight and the diversity of prey classes in the spraint. Spraints with three or four prey classes were larger and had the most propagules.</li>\u0000 \u0000 <li>Most propagules are likely dispersed by “diploendozoochory” involving ingestion first by prey and then by the otters. Neotropical otters have a wide home range, often travelling several kilometres daily, which can promote plant dispersal by carrying propagules between different habitats.</li>\u0000 \u0000 <li>Synthesis: Our results suggest that otters might play an important role in the dispersal of wetland plants, notably aquatic ferns, potentially contributing to the maintenance of these ecosystems. The germination rate, although low, represents opportunities for the successful establishment of some dispersed propagules over longer distances than those provided by otter prey, emphasising the ecological importance of even low-probability dispersal events. This study underlines the potential role of carnivorous mammals in maintaining ecosystem connectivity.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143456111","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":"Niche Difference Prevents Competitive Exclusion between the Invasive Submerged Macrophyte Elodea densa (Planch.) Casp. and Native Hydrilla verticillata (L.f.) Royle in a Large Plateau Lake","authors":"Lei Shi,&nbsp;Xing Zheng,&nbsp;Hang Shan,&nbsp;Zhaohui Hua,&nbsp;Zihao Wen,&nbsp;Jinfeng Yin,&nbsp;Qingchuan Chou,&nbsp;Xiaolin Zhang,&nbsp;Leyi Ni,&nbsp;Te Cao","doi":"10.1111/fwb.14381","DOIUrl":"https://doi.org/10.1111/fwb.14381","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Biological invasions in freshwater ecosystems are increasingly severe, posing significant threats to ecosystem health and economic development. <i>Hydrilla verticillata</i> (L.f.) Royle and <i>Elodea densa</i> (Planch.) Casp. are two of the most aggressive invasive submerged macrophytes worldwide, and often regarded as similar species due to their growth forms and habitat requirements, although there are few field coexistence records. <i>Hydrilla verticillata</i> is a native species in the large plateau Lake Erhai, where the non-native <i>E. densa</i> has been documented since 2017. This study aims at exploring the colonisation process of <i>E. densa</i> as well as its niche overlap and interspecific interactions with native <i>H. verticillata</i> in Lake Erhai.</li>\u0000 \u0000 \u0000 <li>A continuous seven-year field investigation was conducted in Lake Erhai. Four indicators were used to assess the population distribution of <i>H. verticillata</i> and <i>E. densa</i>, including occurrence frequency, biomass, relative abundance and relative niche breadth. The logistic growth model was applied to analyse population dynamics. The Gaussian model was used to characterise their distribution with water depths. A stability index was employed to evaluate variations in measured indices across different water depths. Indicators of niche overlap and interspecific association were used to describe the coexistence and interactions between the two species.</li>\u0000 \u0000 \u0000 <li><i>Elodea densa</i> established several stable populations in Lake Erhai after years of colonisation and naturalisation, primarily colonising deeper areas of the lake than <i>H. verticillata</i>. <i>Elodea densa</i> tended to thrive at depths of around 4.0 m, whereas <i>H. verticillata</i> typically grew at depths from 2.0 to 3.0 m. <i>Hydrilla verticillata</i> demonstrated greater stability across varying water depths than <i>E. densa</i>. Niche overlap between the two species was minimal.</li>\u0000 \u0000 \u0000 <li>Our findings indicated that in this large plateau lake, native <i>H. verticillata</i> exhibited higher competitiveness than alien <i>E. densa</i>. There was a distinct niche difference in water depths between <i>H. verticillata</i> and <i>E. densa</i>, which prevented competitive exclusion. The two species achieved stable coexistence at a lake-wide scale.</li>\u0000 \u0000 \u0000 <li>This study provided the first field evidence for coexistence between two globally recognized invasive species, showing that in habitats with sufficient environmental gradients and filtering pressures, submerged macrophytes similar in taxonomy and appearance could avoid competitive exclusion by occupying different ecological niches, leading to stable coexistence.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438754","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":"Contrasting Patterns of Genetic Variability in Pet-Traded Red Swamp Crayfish Procambarus clarkii and Its Feral Populations","authors":"Francisco J. Oficialdegui,&nbsp;Martin Bláha,&nbsp;Sebastian Prati,&nbsp;Boris Lipták,&nbsp;András Weiperth,&nbsp;Zsombor M. Bányai,&nbsp;Rafał Maciaszek,&nbsp;Jiří Patoka,&nbsp;Kevin Scheers,&nbsp;Pim Lemmers,&nbsp;Jürgen Petutschnig,&nbsp;Miloslav Petrtýl,&nbsp;Adam Petrusek,&nbsp;Antonín Kouba","doi":"10.1111/fwb.70008","DOIUrl":"https://doi.org/10.1111/fwb.70008","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143423550","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":"Assessing the Complex Effects of the Invasive Amphipod Dikerogammarus villosus on Leaf Litter Breakdown in Rivers","authors":"Tomislav Kralj,&nbsp;Susann Bromberger,&nbsp;Carola Winkelmann,&nbsp;Susanne Worischka,&nbsp;Krešimir Žganec,&nbsp;Damir Valić","doi":"10.1111/fwb.70006","DOIUrl":"https://doi.org/10.1111/fwb.70006","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404564","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":"Varying Thermal Dependence of Life History Traits Predicts Responses to Environmental Change in Aquatic Amphibian Larvae","authors":"Kamila Tahalová,&nbsp;Monika Šugerková,&nbsp;Lumír Gvoždík","doi":"10.1111/fwb.70007","DOIUrl":"https://doi.org/10.1111/fwb.70007","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 2","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143404437","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}