ObjectiveClimate change is driving shifts in marine species' distributions, affecting resource availability for fishery supply chains worldwide. While research and governance have been in step with fishing impacts, consequences to the downstream supply chain are not generally considered. In this project, we identify how and to what extent New England seafood supply chains are capable of navigating anticipated shifts in species distributions. The study was especially concerned with the degree to which suppliers would consider incorporating "climate winners": species that are predicted to become more abundant in New England waters.MethodsUsing indicators derived from climate resilience and adaptive fisheries frameworks, we characterized supply chain adaptability for 27 seafood businesses across New England.ResultThe results revealed a range of adaptability linked to particular supplier characteristics, including diversity of services, processing infrastructure, and market diversity. External factors such as consumer preference, regulatory policy, and employment in the industry also indicated climate vulnerabilities. Despite these limiting factors, however, most businesses appeared to be not only capable but also willing to incorporate climate winner species into their portfolio.ConclusionOur conclusions support the idea that New England seafood suppliers adopt different strategies for climate resilience based on their business model, with considerable potential to take advantage of species shifts given the right incentives. To reduce vulnerabilities in the face of unprecedented change, it is critical that managing practitioners and partnering organizations encourage portfolio diversification with market incentives and adaptive management measures.
{"title":"Climate winners: Adapting to shifting species in the New England supply chain","authors":"Nicky Roberts, Eric Walton, Kate Masury","doi":"10.1002/tafs.10478","DOIUrl":"https://doi.org/10.1002/tafs.10478","url":null,"abstract":"ObjectiveClimate change is driving shifts in marine species' distributions, affecting resource availability for fishery supply chains worldwide. While research and governance have been in step with fishing impacts, consequences to the downstream supply chain are not generally considered. In this project, we identify how and to what extent New England seafood supply chains are capable of navigating anticipated shifts in species distributions. The study was especially concerned with the degree to which suppliers would consider incorporating \"climate winners\": species that are predicted to become more abundant in New England waters.MethodsUsing indicators derived from climate resilience and adaptive fisheries frameworks, we characterized supply chain adaptability for 27 seafood businesses across New England.ResultThe results revealed a range of adaptability linked to particular supplier characteristics, including diversity of services, processing infrastructure, and market diversity. External factors such as consumer preference, regulatory policy, and employment in the industry also indicated climate vulnerabilities. Despite these limiting factors, however, most businesses appeared to be not only capable but also willing to incorporate climate winner species into their portfolio.ConclusionOur conclusions support the idea that New England seafood suppliers adopt different strategies for climate resilience based on their business model, with considerable potential to take advantage of species shifts given the right incentives. To reduce vulnerabilities in the face of unprecedented change, it is critical that managing practitioners and partnering organizations encourage portfolio diversification with market incentives and adaptive management measures.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Luke H. Henslee, Renae Ivanoff, Zachary W. Liller, Peter A. H. Westley, Andrew C. Seitz
ObjectiveEstimates of Pacific salmon Oncorhynchus spp. stock composition in coastal fishery harvests are needed to balance fishing opportunities against conservation. Catch partitioning in some small‐scale fisheries can be hindered by insufficient resolution of modern stock classification tools (e.g., genetic stock identification).MethodsWe used acoustic telemetry to investigate the stock composition of commercial landings in the Norton Sound district of Alaska by mimicking local fisheries to capture and tag 578 Coho Salmon O. kisutch in the contiguous Shaktoolik and Unalakleet commercial subdistricts over two seasons.ResultIn total, 341 individuals that were last detected in demarcated spawning areas were assigned to a stock of origin based on putative natal site fidelity. Sex, location of capture, and timing of capture were predictors of stock membership. Models that were fitted to commercial harvest data from the project years (2020 and 2021) estimated that 32.9% of the Shaktoolik subdistrict catch was Shaktoolik stock, 51.5% was Unalakleet stock, and the remainder consisted of other transitory stocks. Conversely, 86.7% of landed Coho Salmon in the Unalakleet subdistrict were Unalakleet stock, whereas the Shaktoolik stock and transitory stocks made up less than 10%, respectively.ConclusionThese findings suggest that coastal salmon fisheries in Norton Sound have access to a variable mixture of stocks whose unique characteristics can be leveraged to examine the effects of directed harvest effort on stock health and diversity.
{"title":"Acoustic telemetry yields stock membership clues for Coho Salmon harvested in coastal fisheries","authors":"Luke H. Henslee, Renae Ivanoff, Zachary W. Liller, Peter A. H. Westley, Andrew C. Seitz","doi":"10.1002/tafs.10486","DOIUrl":"https://doi.org/10.1002/tafs.10486","url":null,"abstract":"ObjectiveEstimates of Pacific salmon <jats:italic>Oncorhynchus</jats:italic> spp. stock composition in coastal fishery harvests are needed to balance fishing opportunities against conservation. Catch partitioning in some small‐scale fisheries can be hindered by insufficient resolution of modern stock classification tools (e.g., genetic stock identification).MethodsWe used acoustic telemetry to investigate the stock composition of commercial landings in the Norton Sound district of Alaska by mimicking local fisheries to capture and tag 578 Coho Salmon <jats:italic>O. kisutch</jats:italic> in the contiguous Shaktoolik and Unalakleet commercial subdistricts over two seasons.ResultIn total, 341 individuals that were last detected in demarcated spawning areas were assigned to a stock of origin based on putative natal site fidelity. Sex, location of capture, and timing of capture were predictors of stock membership. Models that were fitted to commercial harvest data from the project years (2020 and 2021) estimated that 32.9% of the Shaktoolik subdistrict catch was Shaktoolik stock, 51.5% was Unalakleet stock, and the remainder consisted of other transitory stocks. Conversely, 86.7% of landed Coho Salmon in the Unalakleet subdistrict were Unalakleet stock, whereas the Shaktoolik stock and transitory stocks made up less than 10%, respectively.ConclusionThese findings suggest that coastal salmon fisheries in Norton Sound have access to a variable mixture of stocks whose unique characteristics can be leveraged to examine the effects of directed harvest effort on stock health and diversity.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Advances in the Ecology of Stream‐Dwelling Salmonids. Edited by JavierLobon‐Cervia, PhaedraBudy, and RobertGresswell. Springer, Fish and Fisheries Series volume 44. 2024. 740 pages. $219.00 (e‐book), $279.99 (hardcover).","authors":"Thomas P. Quinn","doi":"10.1002/tafs.10493","DOIUrl":"https://doi.org/10.1002/tafs.10493","url":null,"abstract":"","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191659","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Alissa C. Magruder, Gabriel M. Barrile, Stephen Siddons, John Walrath, Annika W. Walters
ObjectiveMovement enables animals to complete their life history by responding to changing environmental conditions. Linking movement behaviors to life history characteristics can allow more targeted management applications for declining native fish populations. We identified seasonal movement patterns of Roundtail Chub Gila robusta and Flannelmouth Sucker Catostomus latipinnis, two understudied species that currently occupy only a portion of their historical range in the Colorado River basin.MethodsWe coupled passive integrated transponder tag antenna systems with multistate capture–recapture models to quantify juvenile and adult movement between main‐stem and tributary habitats in the Blacks Fork subbasin of southwestern Wyoming during 2019–2021. We also evaluated how flow and temperature may cue the timing of seasonal movements.ResultAdults from both species made spring movements, likely associated with spawning, to reach upstream tributary habitat, though adult Flannelmouth Sucker movements were more common and longer. Roundtail Chub primarily moved into the Hams Fork, while Flannelmouth Sucker primarily moved into Muddy Creek, an intermittent tributary that was also identified as important for juvenile rearing. Juvenile movements occurred primarily during the fall months, with distance traveled comparable between species. Temperature and flow influenced the timing of spring movements for adult Flannelmouth Sucker, with rising temperatures triggering movement and low flow potentially limiting access to preferred spawning habitat.ConclusionIdentified movements likely contribute to Roundtail Chub and Flannelmouth Sucker persistence in this highly altered stream system and ultimately provide insights for management and recovery strategies to prevent further population declines.
{"title":"Seasonal movements between main stem and tributaries may facilitate the persistence of Roundtail Chub and Flannelmouth Sucker within an altered stream system","authors":"Alissa C. Magruder, Gabriel M. Barrile, Stephen Siddons, John Walrath, Annika W. Walters","doi":"10.1002/tafs.10489","DOIUrl":"https://doi.org/10.1002/tafs.10489","url":null,"abstract":"ObjectiveMovement enables animals to complete their life history by responding to changing environmental conditions. Linking movement behaviors to life history characteristics can allow more targeted management applications for declining native fish populations. We identified seasonal movement patterns of Roundtail Chub <jats:italic>Gila robusta</jats:italic> and Flannelmouth Sucker <jats:italic>Catostomus latipinnis</jats:italic>, two understudied species that currently occupy only a portion of their historical range in the Colorado River basin.MethodsWe coupled passive integrated transponder tag antenna systems with multistate capture–recapture models to quantify juvenile and adult movement between main‐stem and tributary habitats in the Blacks Fork subbasin of southwestern Wyoming during 2019–2021. We also evaluated how flow and temperature may cue the timing of seasonal movements.ResultAdults from both species made spring movements, likely associated with spawning, to reach upstream tributary habitat, though adult Flannelmouth Sucker movements were more common and longer. Roundtail Chub primarily moved into the Hams Fork, while Flannelmouth Sucker primarily moved into Muddy Creek, an intermittent tributary that was also identified as important for juvenile rearing. Juvenile movements occurred primarily during the fall months, with distance traveled comparable between species. Temperature and flow influenced the timing of spring movements for adult Flannelmouth Sucker, with rising temperatures triggering movement and low flow potentially limiting access to preferred spawning habitat.ConclusionIdentified movements likely contribute to Roundtail Chub and Flannelmouth Sucker persistence in this highly altered stream system and ultimately provide insights for management and recovery strategies to prevent further population declines.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Michael J. Lance, T. David Ritter, Alexander V. Zale, Grant G. Grisak, Jason A. Mullen, Stephen J. Walsh, Kurt C. Heim, Robert Al‐Chokhachy
ObjectiveOur aim was to determine the movement patterns of three abundant salmonids—Brown Trout Salmo trutta, Mountain Whitefish Prosopium williamsoni, and Rainbow Trout Oncorhynchus mykiss—in the Smith River watershed of Montana.MethodsWe tagged 7172 fish with passive integrated transponder (PIT) tags, monitored their movements past 15 stationary PIT arrays over 4 years, and located tagged fish between arrays by conducting mobile surveys.ResultMovement patterns varied seasonally, among species, and among locations. Movement was greatest in the middle portion of the watershed, which included a pristine main‐stem canyon and lower reaches of major tributaries. Fish rarely left the canyon, but movement into the canyon from other regions was common. Mountain Whitefish were most likely to move, and Brown Trout were least likely to move. Most fish travelled less than 10 km, but some fish travelled over 100 km. Distinct movement patterns were not evident; rather, a continuous spectrum of movement behaviors was apparent. Movements by Mountain Whitefish and Rainbow Trout increased during their spawning periods. Movements peaked when mean daily water temperatures were between 11.3 and 17.1°C.ConclusionMovements were diverse and probably contributed to metapopulation dynamics, population resiliency, and species diversity. Fish movements along stream networks connect populations across diverse landscapes, and therefore, protecting and restoring stream connectivity along inland streams such as the Smith River is critical to maintaining productive fish assemblages.
{"title":"Spatial and temporal variability of movements among sympatric salmonids in an unfragmented inland watershed","authors":"Michael J. Lance, T. David Ritter, Alexander V. Zale, Grant G. Grisak, Jason A. Mullen, Stephen J. Walsh, Kurt C. Heim, Robert Al‐Chokhachy","doi":"10.1002/tafs.10485","DOIUrl":"https://doi.org/10.1002/tafs.10485","url":null,"abstract":"ObjectiveOur aim was to determine the movement patterns of three abundant salmonids—Brown Trout <jats:italic>Salmo trutta</jats:italic>, Mountain Whitefish <jats:italic>Prosopium williamsoni</jats:italic>, and Rainbow Trout <jats:italic>Oncorhynchus mykiss</jats:italic>—in the Smith River watershed of Montana.MethodsWe tagged 7172 fish with passive integrated transponder (PIT) tags, monitored their movements past 15 stationary PIT arrays over 4 years, and located tagged fish between arrays by conducting mobile surveys.ResultMovement patterns varied seasonally, among species, and among locations. Movement was greatest in the middle portion of the watershed, which included a pristine main‐stem canyon and lower reaches of major tributaries. Fish rarely left the canyon, but movement into the canyon from other regions was common. Mountain Whitefish were most likely to move, and Brown Trout were least likely to move. Most fish travelled less than 10 km, but some fish travelled over 100 km. Distinct movement patterns were not evident; rather, a continuous spectrum of movement behaviors was apparent. Movements by Mountain Whitefish and Rainbow Trout increased during their spawning periods. Movements peaked when mean daily water temperatures were between 11.3 and 17.1°C.ConclusionMovements were diverse and probably contributed to metapopulation dynamics, population resiliency, and species diversity. Fish movements along stream networks connect populations across diverse landscapes, and therefore, protecting and restoring stream connectivity along inland streams such as the Smith River is critical to maintaining productive fish assemblages.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191658","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Giulio Del Piccolo, Zachary B. Klein, Matthew P. Zeigler
ObjectiveThe Chihuahua Chub Gila nigrescens is a species of conservation concern throughout its distribution. The species is threatened by habitat degradation, nonnative species, and stochastic events (e.g., wildfire and drought). Although conservation efforts are ongoing, it is unclear how Chihuahua Chub in the Mimbres River, New Mexico, respond to conservation actions and stochastic events.MethodsTo address these uncertainties, we collected population demographic and dynamics data on Chihuahua Chub in the Mimbres River and used the data to construct an age‐structured, female‐based population model. The model was used to evaluate the response of Chihuahua Chub to (1) habitat improvement, (2) conservation stocking, and (3) stochastic events. Habitat improvements were modeled as a 50% increase in current abundance. Conservation stocking was represented by two stocking regimes: annual “maintenance” stocking of 200 fish or “catastrophe” stocking of 400–1500 fish for two consecutive years after a stochastic event. The effects of stochastic events were represented by 20–95% reductions in annual survival. Each scenario was simulated for 5000 iterations over 25 years.ResultIn the absence of conservation actions, the Chihuahua Chub population was projected to decline due to stochastic events. However, stocking and habitat improvement decreased the risk of extirpation. When stochastic events resulted in a 95% decline in annual survival, catastrophe stocking reduced population declines in abundance by 47–58% relative to no conservation stocking. When stochastic events caused a 20% reduction in annual survival, habitat improvement increased the median population size after 25 years by almost 50% relative to no habitat improvements.ConclusionCollectively, our results suggest that an increase in habitat and conservation stocking efforts is likely the most effective approach for conserving Chihuahua Chub in the face of future stochastic events.
{"title":"Population viability analysis of Chihuahua Chub in the Mimbres River, New Mexico","authors":"Giulio Del Piccolo, Zachary B. Klein, Matthew P. Zeigler","doi":"10.1002/tafs.10487","DOIUrl":"https://doi.org/10.1002/tafs.10487","url":null,"abstract":"ObjectiveThe Chihuahua Chub <jats:italic>Gila nigrescens</jats:italic> is a species of conservation concern throughout its distribution. The species is threatened by habitat degradation, nonnative species, and stochastic events (e.g., wildfire and drought). Although conservation efforts are ongoing, it is unclear how Chihuahua Chub in the Mimbres River, New Mexico, respond to conservation actions and stochastic events.MethodsTo address these uncertainties, we collected population demographic and dynamics data on Chihuahua Chub in the Mimbres River and used the data to construct an age‐structured, female‐based population model. The model was used to evaluate the response of Chihuahua Chub to (1) habitat improvement, (2) conservation stocking, and (3) stochastic events. Habitat improvements were modeled as a 50% increase in current abundance. Conservation stocking was represented by two stocking regimes: annual “maintenance” stocking of 200 fish or “catastrophe” stocking of 400–1500 fish for two consecutive years after a stochastic event. The effects of stochastic events were represented by 20–95% reductions in annual survival. Each scenario was simulated for 5000 iterations over 25 years.ResultIn the absence of conservation actions, the Chihuahua Chub population was projected to decline due to stochastic events. However, stocking and habitat improvement decreased the risk of extirpation. When stochastic events resulted in a 95% decline in annual survival, catastrophe stocking reduced population declines in abundance by 47–58% relative to no conservation stocking. When stochastic events caused a 20% reduction in annual survival, habitat improvement increased the median population size after 25 years by almost 50% relative to no habitat improvements.ConclusionCollectively, our results suggest that an increase in habitat and conservation stocking efforts is likely the most effective approach for conserving Chihuahua Chub in the face of future stochastic events.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ObjectiveFor foraging animals, energy acquisition is often influenced by an interaction of prey abundance and the amount of space needed to capture sufficient food. Suitable habitat includes those locations where prey capture rates are sufficient to meet energetic requirements for growth and reproduction. Hence, quantifying how space use changes with energy requirements and how prey densities affect prey capture rates in foraging animals provides insight into the mechanisms that create suitable habitat. Here, we were interested in assessing how body size influences foraging site selection, space use, and energy intake by Yellowstone Cutthroat Trout Oncorhynchus virginalis bouvieri. Furthermore, we sought to quantify how foraging rates changed with increasing levels of food.MethodsWe recorded Yellowstone Cutthroat Trout foraging behavior in natural streams and measured space use and foraging rates using three‐dimensional videography.ResultWe found that physical habitat features, such as current velocity, water depth, and foraging distance, were positively correlated with fish body size, but when foraging area was compared to a model of space use, we found that Yellowstone Cutthroat Trout used less space to capture prey than the model predicted. Fish foraging rates and estimated energy intake also increased with increasing prey availability; however, trout captured prey according to a type II functional response, indicating an upper limit to prey capture from handling time constraints.ConclusionThese data demonstrate that Yellowstone Cutthroat Trout display allometric changes in foraging habitat use: larger fish can occupy deeper and faster areas that increase prey encounter rates, but as prey encounter rates increase, the foraging rates become limited by an individual's ability to identify, pursue, and handle prey items.
{"title":"Allometric shifts in foraging site selection and area increase energy intake for Yellowstone Cutthroat Trout but are constrained by functional limits to prey capture","authors":"Tyson B. Hallbert, Ernest R. Keeley","doi":"10.1002/tafs.10484","DOIUrl":"https://doi.org/10.1002/tafs.10484","url":null,"abstract":"ObjectiveFor foraging animals, energy acquisition is often influenced by an interaction of prey abundance and the amount of space needed to capture sufficient food. Suitable habitat includes those locations where prey capture rates are sufficient to meet energetic requirements for growth and reproduction. Hence, quantifying how space use changes with energy requirements and how prey densities affect prey capture rates in foraging animals provides insight into the mechanisms that create suitable habitat. Here, we were interested in assessing how body size influences foraging site selection, space use, and energy intake by Yellowstone Cutthroat Trout <jats:italic>Oncorhynchus virginalis bouvieri</jats:italic>. Furthermore, we sought to quantify how foraging rates changed with increasing levels of food.MethodsWe recorded Yellowstone Cutthroat Trout foraging behavior in natural streams and measured space use and foraging rates using three‐dimensional videography.ResultWe found that physical habitat features, such as current velocity, water depth, and foraging distance, were positively correlated with fish body size, but when foraging area was compared to a model of space use, we found that Yellowstone Cutthroat Trout used less space to capture prey than the model predicted. Fish foraging rates and estimated energy intake also increased with increasing prey availability; however, trout captured prey according to a type II functional response, indicating an upper limit to prey capture from handling time constraints.ConclusionThese data demonstrate that Yellowstone Cutthroat Trout display allometric changes in foraging habitat use: larger fish can occupy deeper and faster areas that increase prey encounter rates, but as prey encounter rates increase, the foraging rates become limited by an individual's ability to identify, pursue, and handle prey items.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191663","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Christopher Manhard, Justin Krebs, Carlos Lozano, Fred Jacobs, Peter Sturke, Ben Eberline, Taylor Allen, Corey Chamberlain
ObjectiveThe purpose of study was to identify environmental factors that influence downstream migration and passage of American Eels Anguilla rostrata in Roanoke Rapids Lake, a reservoir on the Roanoke River formed by the Roanoke Rapids Dam and Power Station.MethodsYellow‐ and silver‐phase American Eels were outfitted with acoustic transmitters and monitored during four out‐migration periods from October 2019 through March 2023 using acoustic telemetry receivers placed in Roanoke Rapids Lake and the Roanoke River downstream of the power station. The timing of downstream passage through the power station was determined using acoustic detection data. Poisson regression models were used to analyze American Eel detections in the context of environmental variables that were hypothesized to cue out‐migration.ResultOut‐migration probability of American Eels from Roanoke Rapids Lake was influenced by time of day, rainfall, and change in lake level attributable to hydropower operations. Predictive models of out‐migration probability demonstrated that the number of migrating American Eels was widely variable across environmental conditions and was particularly sensitive to changes in lake level.ConclusionThe results of this study suggest that management actions, such as scheduled water releases from a dam and the consequent change in lake level (or correlated factors), can influence the onset and timing of American Eel out‐migration.
{"title":"Environmental cues for downstream‐migrating American Eel at a hydroelectric facility","authors":"Christopher Manhard, Justin Krebs, Carlos Lozano, Fred Jacobs, Peter Sturke, Ben Eberline, Taylor Allen, Corey Chamberlain","doi":"10.1002/tafs.10482","DOIUrl":"https://doi.org/10.1002/tafs.10482","url":null,"abstract":"ObjectiveThe purpose of study was to identify environmental factors that influence downstream migration and passage of American Eels <jats:italic>Anguilla rostrata</jats:italic> in Roanoke Rapids Lake, a reservoir on the Roanoke River formed by the Roanoke Rapids Dam and Power Station.MethodsYellow‐ and silver‐phase American Eels were outfitted with acoustic transmitters and monitored during four out‐migration periods from October 2019 through March 2023 using acoustic telemetry receivers placed in Roanoke Rapids Lake and the Roanoke River downstream of the power station. The timing of downstream passage through the power station was determined using acoustic detection data. Poisson regression models were used to analyze American Eel detections in the context of environmental variables that were hypothesized to cue out‐migration.ResultOut‐migration probability of American Eels from Roanoke Rapids Lake was influenced by time of day, rainfall, and change in lake level attributable to hydropower operations. Predictive models of out‐migration probability demonstrated that the number of migrating American Eels was widely variable across environmental conditions and was particularly sensitive to changes in lake level.ConclusionThe results of this study suggest that management actions, such as scheduled water releases from a dam and the consequent change in lake level (or correlated factors), can influence the onset and timing of American Eel out‐migration.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sydney Stark, Megan K. Schall, Geoffrey D. Smith, Aaron P. Maloy, Jason A. Coombs, Tyler Wagner, Julian Avery
ObjectiveFlathead Catfish Pylodictis olivaris are a widespread aquatic invasive species within the United States and a recent invader in the Susquehanna River basin, Pennsylvania. Flathead Catfish are piscivores known to consume native and recreationally important fish species. In the mid‐Atlantic United States, it is unknown how this invader is impacting food webs and which species may be at greatest predation risk. To address this knowledge gap, we DNA barcoded stomach contents collected from Flathead Catfish to identify prey species and elucidate potential predatory impacts of Flathead Catfish in the Susquehanna River.MethodsWe used a Bayesian hierarchical multivariate probit model to investigate if the probability of prey species occurrence in the diets of Flathead Catfish varied seasonally or was a function of Flathead Catfish length.ResultA total of 576 Flathead Catfish were collected during 2020–2021, with 241 individuals having recoverable stomach contents. In all, we identified 47 different prey species. The most common prey species were rusty crayfish Faxonius rusticus, Margined Madtom Noturus insignis, and shiners Notropis spp. While frequency of occurrence of prey species differed across Flathead Catfish length classes (<300 mm, 301–600 mm, 601–900 mm TL), rusty crayfish were commonly found (33.7–44.0% of diets) in stomachs of all size‐classes.ConclusionWe found that Flathead Catfish length and seasonality did influence occurrence probability differentially for several prey species. For example, Channel Catfish Ictalurus punctatus were more likely to appear in shorter Flathead Catfish while Smallmouth Bass Micropterus dolomieu appeared in larger Flathead Catfish. We demonstrate significant variation in Flathead Catfish predation, increasing our understanding of predator–prey dynamics, which is necessary to better manage and identify future impacts to aquatic communities in the Susquehanna River basin.
目标平头鲶（Pylodictis olivaris）是美国一种广泛的水生入侵物种，最近入侵了宾夕法尼亚州的苏斯奎汉纳河流域。扁头鲶是一种食鱼动物，以捕食本地鱼类和重要的休闲鱼类而闻名。在美国大西洋中部，这种入侵者如何影响食物网以及哪些物种可能面临最大的捕食风险尚不清楚。为了填补这一知识空白，我们对从平头鲶鱼身上采集到的胃内容物进行了DNA条形码编码，以确定猎物物种并阐明平头鲶鱼在苏斯奎汉纳河中的潜在捕食影响。方法我们使用贝叶斯分层多变量概率模型来研究猎物物种在平头鲶鱼食物中出现的概率是否随季节变化或与平头鲶鱼的体长有关。我们总共鉴定出 47 种不同的猎物。最常见的猎物物种是锈色小龙虾（Faxonius rusticus）、薮鳢（Noturus insignis）和胫鱼（Notropis spp）。虽然不同长度等级的平头鲶（<300 mm, 301-600 mm, 601-900 mm TL）出现猎物物种的频率不同，但锈色小龙虾是常见的猎物（33.结论我们发现，鲶鱼的体长和季节性确实会对几种猎物的出现概率产生不同的影响。例如，峡鲶（Ictalurus punctatus）更有可能出现在较短的平头鲶中，而小口鲈（Micropterus dolomieu）则出现在较大的平头鲶中。我们展示了平头鲶捕食的显著变化，增加了我们对捕食者-猎物动态的了解，这对于更好地管理和确定未来对苏斯奎汉纳河流域水生生物群落的影响是必要的。
{"title":"Feeding habits and ecological implications of the invasive Flathead Catfish in the Susquehanna River basin, Pennsylvania","authors":"Sydney Stark, Megan K. Schall, Geoffrey D. Smith, Aaron P. Maloy, Jason A. Coombs, Tyler Wagner, Julian Avery","doi":"10.1002/tafs.10480","DOIUrl":"https://doi.org/10.1002/tafs.10480","url":null,"abstract":"ObjectiveFlathead Catfish <jats:italic>Pylodictis olivaris</jats:italic> are a widespread aquatic invasive species within the United States and a recent invader in the Susquehanna River basin, Pennsylvania. Flathead Catfish are piscivores known to consume native and recreationally important fish species. In the mid‐Atlantic United States, it is unknown how this invader is impacting food webs and which species may be at greatest predation risk. To address this knowledge gap, we DNA barcoded stomach contents collected from Flathead Catfish to identify prey species and elucidate potential predatory impacts of Flathead Catfish in the Susquehanna River.MethodsWe used a Bayesian hierarchical multivariate probit model to investigate if the probability of prey species occurrence in the diets of Flathead Catfish varied seasonally or was a function of Flathead Catfish length.ResultA total of 576 Flathead Catfish were collected during 2020–2021, with 241 individuals having recoverable stomach contents. In all, we identified 47 different prey species. The most common prey species were rusty crayfish <jats:italic>Faxonius rusticus</jats:italic>, Margined Madtom <jats:italic>Noturus insignis</jats:italic>, and shiners <jats:italic>Notropis</jats:italic> spp<jats:italic>.</jats:italic> While frequency of occurrence of prey species differed across Flathead Catfish length classes (<300 mm, 301–600 mm, 601–900 mm TL), rusty crayfish were commonly found (33.7–44.0% of diets) in stomachs of all size‐classes.ConclusionWe found that Flathead Catfish length and seasonality did influence occurrence probability differentially for several prey species. For example, Channel Catfish <jats:italic>Ictalurus punctatus</jats:italic> were more likely to appear in shorter Flathead Catfish while Smallmouth Bass <jats:italic>Micropterus dolomieu</jats:italic> appeared in larger Flathead Catfish. We demonstrate significant variation in Flathead Catfish predation, increasing our understanding of predator–prey dynamics, which is necessary to better manage and identify future impacts to aquatic communities in the Susquehanna River basin.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Niall G. Clancy, Jonathan A. McFarland, Megan G. Ahern, Annika W. Walters
ObjectiveIn many Great Plains rivers, functional turnover—the change in proportional dominance of members in biological communities that fill certain ecological roles—has occurred due to impoundment and habitat alteration. The Powder River of Montana and Wyoming remains one of the few unregulated prairie rivers, but long‐term monitoring is limited, so we analyzed changes over time at the functional, assemblage, and species levels.MethodsWe used fish sampling data from 43 different sources collected from 1893 to 2022 to analyze trends in fish communities.ResultAcross the main‐stem Powder River, Sand Shiner Miniellus stramineus and Channel Catfish Ictalurus punctatus substantially increased in abundance, whereas Sturgeon Chub Macrhybopsis gelida decreased. While most other species did not show significant changes in relative abundance (although the always rare Lake Chub Couesius plumbeus may have been extirpated), significant functional turnover occurred in the upper river due to increases in generalist feeders, predators, omnivores, and cavity‐guarding species, with declines in benthic feeders, invertivores, and pelagic broadcast spawners, among others. Community and functional changes were more substantial in the upper river than in the lower river, possibly due to augmented streamflow from a major tributary.ConclusionFunctional turnover within the upper river was substantial despite the relative stability of most individual species, even when the Sand Shiner—the most significantly increasing species—was excluded from analysis. This suggests small but consistent increases and decreases within functional groups, which cumulatively are likely impacting the ecosystem. We hypothesize a complex set of mechanisms causing these changes that offer avenues for future work. The collation of data from disparate studies and the resampling of even a limited number of historical fish collection locations can greatly aid in identifying potential fish community changes in systems where monitoring is limited.
{"title":"Functional turnover in a prairie river fish community over 130 years","authors":"Niall G. Clancy, Jonathan A. McFarland, Megan G. Ahern, Annika W. Walters","doi":"10.1002/tafs.10479","DOIUrl":"https://doi.org/10.1002/tafs.10479","url":null,"abstract":"ObjectiveIn many Great Plains rivers, functional turnover—the change in proportional dominance of members in biological communities that fill certain ecological roles—has occurred due to impoundment and habitat alteration. The Powder River of Montana and Wyoming remains one of the few unregulated prairie rivers, but long‐term monitoring is limited, so we analyzed changes over time at the functional, assemblage, and species levels.MethodsWe used fish sampling data from 43 different sources collected from 1893 to 2022 to analyze trends in fish communities.ResultAcross the main‐stem Powder River, Sand Shiner <jats:italic>Miniellus stramineus</jats:italic> and Channel Catfish <jats:italic>Ictalurus punctatus</jats:italic> substantially increased in abundance, whereas Sturgeon Chub <jats:italic>Macrhybopsis gelida</jats:italic> decreased. While most other species did not show significant changes in relative abundance (although the always rare Lake Chub <jats:italic>Couesius plumbeus</jats:italic> may have been extirpated), significant functional turnover occurred in the upper river due to increases in generalist feeders, predators, omnivores, and cavity‐guarding species, with declines in benthic feeders, invertivores, and pelagic broadcast spawners, among others. Community and functional changes were more substantial in the upper river than in the lower river, possibly due to augmented streamflow from a major tributary.ConclusionFunctional turnover within the upper river was substantial despite the relative stability of most individual species, even when the Sand Shiner—the most significantly increasing species—was excluded from analysis. This suggests small but consistent increases and decreases within functional groups, which cumulatively are likely impacting the ecosystem. We hypothesize a complex set of mechanisms causing these changes that offer avenues for future work. The collation of data from disparate studies and the resampling of even a limited number of historical fish collection locations can greatly aid in identifying potential fish community changes in systems where monitoring is limited.","PeriodicalId":23214,"journal":{"name":"Transactions of The American Fisheries Society","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142191662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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