{"title":"Signals in Flux: Investigating the Seasonal Turnover of the Diel Vertical Migration-Inducing Kairomone 5α-Cyprinol Sulfate","authors":"Johanna Ahlers, Eric von Elert","doi":"10.1111/fwb.70109","DOIUrl":"https://doi.org/10.1111/fwb.70109","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70109","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145316954","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}
Hu He, You Zhang, Yan Li, Kai Peng, Robert P. Rutter, Jussi Jyväsjärvi, Heikki Hämäläinen, Chrysoula Ntislidou, Jianjun Wang, Min Zhang, Kuanyi Li, Zhengwen Liu, Liselotte S. Johansson, Martin Søndergaard, Yongjiu Cai, Haijun Wang, Erik Jeppesen, Jonathan M. Chase
The latitudinal diversity gradient is one of the most striking biogeographical patterns on Earth and typically reveals increases in species richness from the poles towards the tropics. However, the latitudinal diversity patterns vary among taxa, ecosystems and scales. In freshwater, the patterns are particularly obscure, partially owing to limited geographical and taxonomical scope, as well as unclear controls of sampling effort.
Here, we compiled data from a diverse group of benthic macroinvertebrates derived from standardised offshore surveys of 485 shallow freshwater lakes spread across the northern hemisphere to elucidate how diversity patterns at multiple spatial scales vary with latitude. At each scale, we calculated multiple effort-controlled measures emphasising different aspects of biodiversity.
Contrary to our expectations, we found no evidence of a latitudinal gradient for any metric of diversity at small (local, α-) or large (regional, γ-) scales, nor any pattern of β-diversity among the lakes.
Our results therefore provide some of the broadest evidence to date of a lack of latitudinal diversity gradient in offshore benthic macroinvertebrates in freshwater shallow lakes. Understanding this null relationship, and its contrast with many terrestrial and marine patterns, will require a concerted effort towards data compilation and comparative analyses.
{"title":"Dissecting Trends in the Latitudinal Diversity Gradient of Benthic Macroinvertebrates in Freshwater Lakes Across Scales","authors":"Hu He, You Zhang, Yan Li, Kai Peng, Robert P. Rutter, Jussi Jyväsjärvi, Heikki Hämäläinen, Chrysoula Ntislidou, Jianjun Wang, Min Zhang, Kuanyi Li, Zhengwen Liu, Liselotte S. Johansson, Martin Søndergaard, Yongjiu Cai, Haijun Wang, Erik Jeppesen, Jonathan M. Chase","doi":"10.1111/fwb.70106","DOIUrl":"https://doi.org/10.1111/fwb.70106","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>The latitudinal diversity gradient is one of the most striking biogeographical patterns on Earth and typically reveals increases in species richness from the poles towards the tropics. However, the latitudinal diversity patterns vary among taxa, ecosystems and scales. In freshwater, the patterns are particularly obscure, partially owing to limited geographical and taxonomical scope, as well as unclear controls of sampling effort.</li>\u0000 \u0000 \u0000 <li>Here, we compiled data from a diverse group of benthic macroinvertebrates derived from standardised offshore surveys of 485 shallow freshwater lakes spread across the northern hemisphere to elucidate how diversity patterns at multiple spatial scales vary with latitude. At each scale, we calculated multiple effort-controlled measures emphasising different aspects of biodiversity.</li>\u0000 \u0000 \u0000 <li>Contrary to our expectations, we found no evidence of a latitudinal gradient for any metric of diversity at small (local, α-) or large (regional, γ-) scales, nor any pattern of β-diversity among the lakes.</li>\u0000 \u0000 \u0000 <li>Our results therefore provide some of the broadest evidence to date of a lack of latitudinal diversity gradient in offshore benthic macroinvertebrates in freshwater shallow lakes. Understanding this null relationship, and its contrast with many terrestrial and marine patterns, will require a concerted effort towards data compilation and comparative analyses.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145272562","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}
Yaling Su, Hu He, Kuanyi Li, Zhengwen Liu, Erik Jeppesen
Intraguild predation (IGP) occurs when one predator species consumes another species with whom it also competes for shared prey. IGP is widely believed to reduce prey suppression. In terrestrial ecosystems, structurally complex habitats may lessen IGP by offering refuge to intermediate predators. However, whether submerged macrophytes in shallow lakes could mitigate such antagonistic interactions remains largely unexplored. We examined the interactive impact of two aquatic predators, fish (Pelteobagrus fulvidraco, intraguild predator) and shrimp (Exopalaemon modestus, intraguild prey), on the biomass and assimilation of zooplankton prey in vegetation-sparse and vegetation-dense habitats in outdoor mesocosms.
Relative to the shrimp-alone treatment, the presence of both predators resulted in a higher average zooplankton biomass in both simple and complex vegetation habitats. This suggests that IGP between the two predator species alleviated predation pressure on the zooplankton community when compared to the shrimp-alone mesocosms. However, no significant predator-macrophyte interactions were detected, suggesting that the strength of IGP was not significantly affected by habitat vegetation complexity.
Evidence from zooplankton dietary markers (fatty acids) and associated carbon stable isotopes further substantiated that vegetation complexity did not significantly affect the assimilation of zooplankton by predators. Additionally, vegetation complexity had no significant effect on chlorophyll a concentrations.
The results demonstrate that the strength of IGP was not substantially influenced by habitat vegetation complexity. Our findings have implications for food webs and predator–prey dynamics within aquatic systems. Thus, when implementing biomanipulation efforts aimed at combating eutrophication by enhancing herbivory on phytoplankton and promoting the resurgence of submerged macrophytes, both the quantity and diversity of predator assemblages, as well as the scale effects of submerged macrophytes, should be considered.
{"title":"Intraguild Predation Is Insufficiently Mitigated by Complex-Structured Aquatic Vegetation","authors":"Yaling Su, Hu He, Kuanyi Li, Zhengwen Liu, Erik Jeppesen","doi":"10.1111/fwb.70104","DOIUrl":"https://doi.org/10.1111/fwb.70104","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Intraguild predation (IGP) occurs when one predator species consumes another species with whom it also competes for shared prey. IGP is widely believed to reduce prey suppression. In terrestrial ecosystems, structurally complex habitats may lessen IGP by offering refuge to intermediate predators. However, whether submerged macrophytes in shallow lakes could mitigate such antagonistic interactions remains largely unexplored. We examined the interactive impact of two aquatic predators, fish (<i>Pelteobagrus fulvidraco</i>, intraguild predator) and shrimp (<i>Exopalaemon modestus</i>, intraguild prey), on the biomass and assimilation of zooplankton prey in vegetation-sparse and vegetation-dense habitats in outdoor mesocosms.</li>\u0000 \u0000 \u0000 <li>Relative to the shrimp-alone treatment, the presence of both predators resulted in a higher average zooplankton biomass in both simple and complex vegetation habitats. This suggests that IGP between the two predator species alleviated predation pressure on the zooplankton community when compared to the shrimp-alone mesocosms. However, no significant predator-macrophyte interactions were detected, suggesting that the strength of IGP was not significantly affected by habitat vegetation complexity.</li>\u0000 \u0000 \u0000 <li>Evidence from zooplankton dietary markers (fatty acids) and associated carbon stable isotopes further substantiated that vegetation complexity did not significantly affect the assimilation of zooplankton by predators. Additionally, vegetation complexity had no significant effect on chlorophyll <i>a</i> concentrations.</li>\u0000 \u0000 \u0000 <li>The results demonstrate that the strength of IGP was not substantially influenced by habitat vegetation complexity. Our findings have implications for food webs and predator–prey dynamics within aquatic systems. Thus, when implementing biomanipulation efforts aimed at combating eutrophication by enhancing herbivory on phytoplankton and promoting the resurgence of submerged macrophytes, both the quantity and diversity of predator assemblages, as well as the scale effects of submerged macrophytes, should be considered.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145271920","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}
Marcos A. Ferraz, Renan S. Rezende, Paula M. de Omena, Larissa C. Costa, Rebecca Oester, Andreas Bruder, Marcelo S. Moretti
{"title":"Upstream Deforestation and Nonnative Crops Affect Leaf Breakdown and Aquatic Invertebrate Assemblages in Streams","authors":"Marcos A. Ferraz, Renan S. Rezende, Paula M. de Omena, Larissa C. Costa, Rebecca Oester, Andreas Bruder, Marcelo S. Moretti","doi":"10.1111/fwb.70102","DOIUrl":"https://doi.org/10.1111/fwb.70102","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70102","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145224010","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}
This study examines endogenous and environmental factors that might affect the timing and propensity for sex in a population of the rotifer Asplanchna brightwellii living in a Chihuahuan Desert habitat with hydroperiods of about 2–3 weeks. Multiple clones were initiated from stem females hatched from resting eggs in the sediment and cultured on Cryptomonas erosa, an alga containing tocopherol (vitamin E) required for induction of mictic females and hence production of males and fertilised resting eggs. Two hypotheses regarding the commitment of A. brightwellii to sexual reproduction were considered. First, does its propensity for sex differ in early and late parthenogenetic generations after stem females hatch? Second, is its propensity for sex affected by its population density?
Experiments testing eight clones over 10 successive generations from the stem female showed no significant effect of generation on propensity for mictic-female production. Percentages of mictic females in small populations initiated by juvenile females from each generation generally were low (grand mean of 9%).
Experiments with five clones showed that the propensity for mictic-female production was density independent. Percentages of mictic daughters produced by single amictic females cultured from birth in 70 mL or 2 mL did not differ significantly and generally were low (0%–18%).
The persistent and low propensity for sexual reproduction in laboratory populations of these A. brightwellii clones suggests a low, fixed propensity for sex whenever the diet contains tocopherol and allows induction of mictic females. Such a life cycle strategy appears suitable for an ephemeral habitat, where the duration of hydroperiods and growing seasons is very short and unpredictable. It assures the production of some resting eggs soon after population development without greatly limiting the potential for rapid population growth via female parthenogenesis. Clones with a relatively high propensity for sex may have an advantage during shorter growing seasons, and vice versa.
{"title":"Sexual Reproduction in the Rotifer Asplanchna brightwellii from a Temporary Habitat: Tests for Transgenerational and Population-Density Effects","authors":"John J. Gilbert, Jessica V. Trout-Haney","doi":"10.1111/fwb.70099","DOIUrl":"https://doi.org/10.1111/fwb.70099","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>This study examines endogenous and environmental factors that might affect the timing and propensity for sex in a population of the rotifer <i>Asplanchna brightwellii</i> living in a Chihuahuan Desert habitat with hydroperiods of about 2–3 weeks. Multiple clones were initiated from stem females hatched from resting eggs in the sediment and cultured on <i>Cryptomonas erosa</i>, an alga containing tocopherol (vitamin E) required for induction of mictic females and hence production of males and fertilised resting eggs. Two hypotheses regarding the commitment of <i>A. brightwellii</i> to sexual reproduction were considered. First, does its propensity for sex differ in early and late parthenogenetic generations after stem females hatch? Second, is its propensity for sex affected by its population density?</li>\u0000 \u0000 \u0000 <li>Experiments testing eight clones over 10 successive generations from the stem female showed no significant effect of generation on propensity for mictic-female production. Percentages of mictic females in small populations initiated by juvenile females from each generation generally were low (grand mean of 9%).</li>\u0000 \u0000 \u0000 <li>Experiments with five clones showed that the propensity for mictic-female production was density independent. Percentages of mictic daughters produced by single amictic females cultured from birth in 70 mL or 2 mL did not differ significantly and generally were low (0%–18%).</li>\u0000 \u0000 \u0000 <li>The persistent and low propensity for sexual reproduction in laboratory populations of these <i>A. brightwellii</i> clones suggests a low, fixed propensity for sex whenever the diet contains tocopherol and allows induction of mictic females. Such a life cycle strategy appears suitable for an ephemeral habitat, where the duration of hydroperiods and growing seasons is very short and unpredictable. It assures the production of some resting eggs soon after population development without greatly limiting the potential for rapid population growth via female parthenogenesis. Clones with a relatively high propensity for sex may have an advantage during shorter growing seasons, and vice versa.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181605","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":"Issue Information - Cover and Ed Board","authors":"","doi":"10.1111/fwb.14282","DOIUrl":"https://doi.org/10.1111/fwb.14282","url":null,"abstract":"","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 10","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.14282","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181604","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}
Katterine Rincón-Palau, Anna Badosa, Maria Cuenca-Cambronero, Carolina Trochine, Serena Sgarzi, Xavier D. Quintana, Dani Boix, Sandra Brucet
{"title":"The Size Structure of the Zooplankton Community Reflects Better the Trophic Status of Mediterranean Ponds Than the Taxonomic Structure","authors":"Katterine Rincón-Palau, Anna Badosa, Maria Cuenca-Cambronero, Carolina Trochine, Serena Sgarzi, Xavier D. Quintana, Dani Boix, Sandra Brucet","doi":"10.1111/fwb.70101","DOIUrl":"https://doi.org/10.1111/fwb.70101","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145146561","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":"Leaf Litter Input in Aquatic Systems Increases Amphibian Biomass Production and Body Mass With Insecticide Exposure or Competition","authors":"Haley Durbin, Holley Freeman, Michelle D. Boone","doi":"10.1111/fwb.70096","DOIUrl":"https://doi.org/10.1111/fwb.70096","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70096","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145111137","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}
Niall G. Clancy, Phaedra E. Budy, Annika W. Walters
Both local environmental factors and historical biogeography shape ecological communities, but determining which historical biogeographical patterns correspond with contemporary climate vulnerability is an underused conservation method. The historical colonisation patterns of freshwater fishes following the Pleistocene (‘Ice Age’) glaciations offer an ideal model for comparing historical biogeography and climate-change vulnerability.
We used current thermal niches and future stream-temperature projections to estimate the climate vulnerability of 29 Great Plains and Rocky Mountain fishes that we classified as either early or late colonists of the region in the wake of glacial retreat (~19,000 years ago).
Ninety-three percent of the most vulnerable species were amongst the earliest colonists of the region and we consider ‘postglacial-pioneer species’. Median predicted site loss (number of historically occupied sites predicted to become too warm by end-of-century) was 0% for late colonising species and 33% for early colonising species.
We provide empirical evidence that postglacial-pioneer fishes are uniquely vulnerable to climate change, and we suggest this may apply to many taxa from formerly glaciated regions. More broadly, we demonstrate that evaluating the relationship between current species-environment patterns and historical biogeography may be a fruitful avenue for future climate change and conservation research.
{"title":"Ice Age Biogeography Corresponds With Current Climate Vulnerability of Freshwater Fishes","authors":"Niall G. Clancy, Phaedra E. Budy, Annika W. Walters","doi":"10.1111/fwb.70098","DOIUrl":"https://doi.org/10.1111/fwb.70098","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Both local environmental factors and historical biogeography shape ecological communities, but determining which historical biogeographical patterns correspond with contemporary climate vulnerability is an underused conservation method. The historical colonisation patterns of freshwater fishes following the Pleistocene (‘Ice Age’) glaciations offer an ideal model for comparing historical biogeography and climate-change vulnerability.</li>\u0000 \u0000 \u0000 <li>We used current thermal niches and future stream-temperature projections to estimate the climate vulnerability of 29 Great Plains and Rocky Mountain fishes that we classified as either early or late colonists of the region in the wake of glacial retreat (~19,000 years ago).</li>\u0000 \u0000 \u0000 <li>Ninety-three percent of the most vulnerable species were amongst the earliest colonists of the region and we consider ‘postglacial-pioneer species’. Median predicted site loss (number of historically occupied sites predicted to become too warm by end-of-century) was 0% for late colonising species and 33% for early colonising species.</li>\u0000 \u0000 \u0000 <li>We provide empirical evidence that postglacial-pioneer fishes are uniquely vulnerable to climate change, and we suggest this may apply to many taxa from formerly glaciated regions. More broadly, we demonstrate that evaluating the relationship between current species-environment patterns and historical biogeography may be a fruitful avenue for future climate change and conservation research.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101983","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}
Alexander L. Koeberle, Meredith L. Bartron, Aaron P. Maloy, Christopher Rees, Lauren Atkins, Webster Pearsall, Brad E. Hammers, Daniel Mulhall, James E. McKenna Jr., Marc Chalupnicki, Lewis P. McCaffrey, Suresh A. Sethi
Applications of environmental DNA (eDNA) based detection technology to evaluate the distribution of aquatic organisms are increasing; yet field validations of eDNA are important to measure accuracy in study systems. To successfully apply this technology to species conservation, it is critical to understand how both species biology and environmental conditions affect the accuracy of inference from eDNA detection data.
We implemented a field assessment of the accuracy and spatial resolution of eDNA-based species distributions for a native cold-water, schooling fish, cisco Coregonus artedi, that has been reintroduced to a deep temperate lake. We leveraged a combination of acoustic telemetry, providing known spatial locations of tagged fish, and lake-wide eDNA sampling to infer their distribution in Keuka Lake, New York, USA. Sub-surface (12 m and 18 m depths) eDNA samples were collected to accommodate the diel vertical migration behaviour of this fish species.
The results of this study validated the accuracy of positive eDNA detections with the distribution of tagged fish to coarse spatial scales. Yet, several fine-scale locations revealed a mismatch between eDNA and acoustic telemetry detections; consistent with rapid transport of genetic material via lake currents.
Empirical measurements of lake currents using drifters found cisco eDNA detections could deviate from specimens' source locations by as much as 3.3 km at 12 m depth or 1.5 km at 18 m depth over a 24 h transport period.
Our study indicates that accurate species distributions estimated from eDNA sampling in lakes may require further understanding of transport mechanisms and persistence of environmental genetic material to relate point detections to source animal locations. Integrating eDNA sampling with additional data collection of species biology and environmental conditions will increase the spatial resolution of fish distribution assessments.
{"title":"How Accurately Does eDNA Reflect the Spatial Distribution of Cold-Water Fish? Field Validation From a Temperate Lake","authors":"Alexander L. Koeberle, Meredith L. Bartron, Aaron P. Maloy, Christopher Rees, Lauren Atkins, Webster Pearsall, Brad E. Hammers, Daniel Mulhall, James E. McKenna Jr., Marc Chalupnicki, Lewis P. McCaffrey, Suresh A. Sethi","doi":"10.1111/fwb.70089","DOIUrl":"https://doi.org/10.1111/fwb.70089","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Applications of environmental DNA (eDNA) based detection technology to evaluate the distribution of aquatic organisms are increasing; yet field validations of eDNA are important to measure accuracy in study systems. To successfully apply this technology to species conservation, it is critical to understand how both species biology and environmental conditions affect the accuracy of inference from eDNA detection data.</li>\u0000 \u0000 \u0000 <li>We implemented a field assessment of the accuracy and spatial resolution of eDNA-based species distributions for a native cold-water, schooling fish, cisco <i>Coregonus artedi</i>, that has been reintroduced to a deep temperate lake. We leveraged a combination of acoustic telemetry, providing known spatial locations of tagged fish, and lake-wide eDNA sampling to infer their distribution in Keuka Lake, New York, USA. Sub-surface (12 m and 18 m depths) eDNA samples were collected to accommodate the diel vertical migration behaviour of this fish species.</li>\u0000 \u0000 \u0000 <li>The results of this study validated the accuracy of positive eDNA detections with the distribution of tagged fish to coarse spatial scales. Yet, several fine-scale locations revealed a mismatch between eDNA and acoustic telemetry detections; consistent with rapid transport of genetic material via lake currents.</li>\u0000 \u0000 \u0000 <li>Empirical measurements of lake currents using drifters found cisco eDNA detections could deviate from specimens' source locations by as much as 3.3 km at 12 m depth or 1.5 km at 18 m depth over a 24 h transport period.</li>\u0000 \u0000 \u0000 <li>Our study indicates that accurate species distributions estimated from eDNA sampling in lakes may require further understanding of transport mechanisms and persistence of environmental genetic material to relate point detections to source animal locations. Integrating eDNA sampling with additional data collection of species biology and environmental conditions will increase the spatial resolution of fish distribution assessments.</li>\u0000 </ol>\u0000 \u0000 </div>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101984","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}
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