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}
Jeremy M. Brooks, Colden V. Baxter, Dana R. Warren, Keeley L. MacNeill
<div> <p> </p><ol> <li>Decades-old research describes dynamic interdependence among aquatic and terrestrial food webs, leading to calls for integrating cross-ecosystem linkages with landscape ecology to evaluate dynamics of spatially-subsidised food webs. Though development of meta-community theory has suggested that such spatial dynamics may help sustain biodiversity, empirical data remain limited. In northern Yellowstone National Park, over a century of terrestrial wildlife dynamics, including the extirpation and subsequent reintroduction of wolves, have contributed to a habitat mosaic in which stream-riparian ecosystems are dominated by either woody or herbaceous vegetation. In the context of this habitat mosaic, we addressed the overarching questions: (1) Are habitat mosaics associated with spatial and temporal variation in reciprocal fluxes and linked food webs and (2) how do biodiversity, organism traits and species interactions influence, and are they influenced by, that spatial and temporal variation?</li> <li>From 2019 to 2021, we intensively sampled eight headwater streams to characterise reciprocal fluxes of aquatic and terrestrial invertebrates and the patterns of potential responses by fish, birds, bats and spiders. We evaluated sites individually as well as how they contributed to a meta-community.</li> <li>We found that local stream-riparian ecosystems contributed to a mosaic in which reciprocal fluxes of invertebrates among local patches were asynchronous and tracked by both aquatic and terrestrial consumers in ways mediated by organism traits. Within sites, aquatic and terrestrial invertebrate fluxes were seasonally asynchronous with each other, but these patterns varied from site to site. Across the mosaic, comparisons of daily aquatic insect emergence varied from 25% to 167% among streams and did so variably throughout the year, revealing asynchronous dynamics created at the meta-community scale. Daily inputs of terrestrial invertebrates were similarly asynchronous across the mosaic, varying from 14% to 170%. These asynchronies were positively correlated with invertebrate beta diversity and associated with varying riparian vegetation, stream temperature, and flow regimes. In turn, in situ consumers tracked the allochthonous invertebrate prey in ways that were mediated by site context (i.e., local habitat characteristics) and consumer traits (e.g., range, foraging strategy and breeding requirements).</li> <li>Based on these observations as an example, we infer there is not one way for food webs to be reciprocally and spatially linked, but multiple ways that can vary both across a spatial mosaic and through time. Our findings provide empirical evidence suggesting potential relationships between habitat complexity and the maintenance of biodive
{"title":"Enter the Mosaic: Aquatic-Terrestrial Reciprocal Fluxes and Food Webs Are Dynamically Interdependent Across Space and Through Time","authors":"Jeremy M. Brooks, Colden V. Baxter, Dana R. Warren, Keeley L. MacNeill","doi":"10.1111/fwb.70094","DOIUrl":"https://doi.org/10.1111/fwb.70094","url":null,"abstract":"<div>\u0000 \u0000 <p>\u0000 \u0000 </p><ol>\u0000 \u0000 \u0000 <li>Decades-old research describes dynamic interdependence among aquatic and terrestrial food webs, leading to calls for integrating cross-ecosystem linkages with landscape ecology to evaluate dynamics of spatially-subsidised food webs. Though development of meta-community theory has suggested that such spatial dynamics may help sustain biodiversity, empirical data remain limited. In northern Yellowstone National Park, over a century of terrestrial wildlife dynamics, including the extirpation and subsequent reintroduction of wolves, have contributed to a habitat mosaic in which stream-riparian ecosystems are dominated by either woody or herbaceous vegetation. In the context of this habitat mosaic, we addressed the overarching questions: (1) Are habitat mosaics associated with spatial and temporal variation in reciprocal fluxes and linked food webs and (2) how do biodiversity, organism traits and species interactions influence, and are they influenced by, that spatial and temporal variation?</li>\u0000 \u0000 \u0000 <li>From 2019 to 2021, we intensively sampled eight headwater streams to characterise reciprocal fluxes of aquatic and terrestrial invertebrates and the patterns of potential responses by fish, birds, bats and spiders. We evaluated sites individually as well as how they contributed to a meta-community.</li>\u0000 \u0000 \u0000 <li>We found that local stream-riparian ecosystems contributed to a mosaic in which reciprocal fluxes of invertebrates among local patches were asynchronous and tracked by both aquatic and terrestrial consumers in ways mediated by organism traits. Within sites, aquatic and terrestrial invertebrate fluxes were seasonally asynchronous with each other, but these patterns varied from site to site. Across the mosaic, comparisons of daily aquatic insect emergence varied from 25% to 167% among streams and did so variably throughout the year, revealing asynchronous dynamics created at the meta-community scale. Daily inputs of terrestrial invertebrates were similarly asynchronous across the mosaic, varying from 14% to 170%. These asynchronies were positively correlated with invertebrate beta diversity and associated with varying riparian vegetation, stream temperature, and flow regimes. In turn, in situ consumers tracked the allochthonous invertebrate prey in ways that were mediated by site context (i.e., local habitat characteristics) and consumer traits (e.g., range, foraging strategy and breeding requirements).</li>\u0000 \u0000 \u0000 <li>Based on these observations as an example, we infer there is not one way for food webs to be reciprocally and spatially linked, but multiple ways that can vary both across a spatial mosaic and through time. Our findings provide empirical evidence suggesting potential relationships between habitat complexity and the maintenance of biodive","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":"145101985","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}
Rebeca Arias-Real, Manuel Delgado-Baquerizo, Simone Guareschi, Cayetano Gutiérrez-Cánovas
{"title":"Assessing the Effects of Fresh, Air-Drying and Freezing Preservation Methods on Enzymatic Activities From Fluvial Ecosystems","authors":"Rebeca Arias-Real, Manuel Delgado-Baquerizo, Simone Guareschi, Cayetano Gutiérrez-Cánovas","doi":"10.1111/fwb.70095","DOIUrl":"https://doi.org/10.1111/fwb.70095","url":null,"abstract":"<p>\u0000 \u0000 </p>","PeriodicalId":12365,"journal":{"name":"Freshwater Biology","volume":"70 9","pages":""},"PeriodicalIF":2.7,"publicationDate":"2025-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/fwb.70095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145101652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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