Ecology of Freshwater Fish最新文献

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Low‐head dam fragmentation, habitat alteration, and invasive predators degrade a Western United States stream fish assemblage 低水头水坝破碎化、栖息地改变和外来捕食者使美国西部溪流鱼群退化

Ecology of Freshwater Fish Pub Date : 2024-02-12 DOI: 10.1111/eff.12773

M. Haworth, K. Bestgen

{"title":"Low‐head dam fragmentation, habitat alteration, and invasive predators degrade a Western United States stream fish assemblage","authors":"M. Haworth, K. Bestgen","doi":"10.1111/eff.12773","DOIUrl":"https://doi.org/10.1111/eff.12773","url":null,"abstract":"Dams fragment streams, alter hydrology and habitat, and facilitate establishment of nonnative species worldwide to the detriment of native biota. Understanding and mitigating these effects to conserve and restore stream fish assemblages has relied on short‐ and long‐term datasets to assess acute and chronic change through time, craft management strategies, and measure remediation success. We used sampling records collected over a 29‐year period (1993–2021) to examine likely causes of fish assemblage change in the Cache la Poudre River, Colorado, USA. Numerous low‐head dams have reduced connectivity and altered flow, temperature, and habitat in the transition zone, a reach that historically supported rare and sensitive taxa valuable to regional biodiversity. We found diversity, distribution, and abundance of native species declined since the early 1990s, with formerly rare taxa extirpated and some common species becoming rare. Native taxa remained numerically dominant in warmer downstream reaches most affected by streamflow diversion but were incrementally reduced in richness and abundance upstream of low‐head dams without fishways. Concurrently, nonnative Brown Trout Salmo trutta increased in distribution and abundance, dominating upstream reaches that receive cooler and more stable flows, and expanding into downstream reaches where they were formerly absent, with likely negative consequences for native fishes. In the absence of mitigation, these collective effects, plus recent wildfire disturbance and future water development, will continue to degrade stream fish assemblages in our study area, and worldwide, where resource managers face the often‐competing interests of conserving native species, providing recreational fisheries, and meeting increasing water demands.","PeriodicalId":507419,"journal":{"name":"Ecology of Freshwater Fish","volume":"60 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139843456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Instream barriers contribute to population isolation of a small‐bodied, benthic, headwater‐specialist fish (Percidae) 溪流障碍导致一种体型较小、底栖、专攻上游水域的鱼类（鲈科）的种群隔离

Ecology of Freshwater Fish Pub Date : 2024-02-12 DOI: 10.1111/eff.12769

River A. Watson, Alexis V. Culley, Catherine G. Haase, Matthew R. Thomas, Stephanie L. Brandt, M. Floyd, Rebecca E. Blanton

{"title":"Instream barriers contribute to population isolation of a small‐bodied, benthic, headwater‐specialist fish (Percidae)","authors":"River A. Watson, Alexis V. Culley, Catherine G. Haase, Matthew R. Thomas, Stephanie L. Brandt, M. Floyd, Rebecca E. Blanton","doi":"10.1111/eff.12769","DOIUrl":"https://doi.org/10.1111/eff.12769","url":null,"abstract":"Genetic differentiation in aquatic systems is often driven by geographic distance (isolation by distance) due to the linear and hierarchical distribution of populations, but habitat fragmentation often exacerbates this effect by decreasing population connectivity, leading to isolation by resistance. Stronghold populations of the Kentucky Arrow Darter (Etheostoma spilotum) in the South Fork Kentucky River system within the Daniel Boone National Forest of eastern Kentucky, USA have a high population structure not explained by distance alone. Higher than expected levels of genetic differentiation among proximate populations were hypothesized to be driven by land‐use change, but this was not previously tested. Here we use a riverscape genetics approach to test for the effects of natural landscape features including slope, elevation and stream size, and anthropogenically altered habitat features, including specific conductance (conductivity), culverts and forest cover, on population connectivity and genetic diversity of E. spilotum. We found isolation of populations among all tributary systems and a strong, positive relationship between genetic and geographic distances as expected. However, high conductivity levels due to surface coal mining best explain the population structure observed. We also found signatures of low genetic diversity overall and indicators that culverts may limit upstream movements of E. spilotum. This study provides a novel fine‐scale view of the effects of instream and landscape features on connectivity among, and genetic diversity within populations of an imperilled, small‐bodied, benthic fish.","PeriodicalId":507419,"journal":{"name":"Ecology of Freshwater Fish","volume":"138 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139842955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Life‐history connections to long‐term fish population trends in a species‐rich temperate river 一条物种丰富的温带河流中鱼类种群长期趋势的生命史联系

Ecology of Freshwater Fish Pub Date : 2024-02-06 DOI: 10.1111/eff.12767

Andrew J. Nagy, Mary C. Freeman, Brian J. Irwin, Seth J. Wenger

{"title":"Life‐history connections to long‐term fish population trends in a species‐rich temperate river","authors":"Andrew J. Nagy, Mary C. Freeman, Brian J. Irwin, Seth J. Wenger","doi":"10.1111/eff.12767","DOIUrl":"https://doi.org/10.1111/eff.12767","url":null,"abstract":"Fishes exhibit a diverse range of traits encompassing life‐history strategies, feeding behaviours and spawning behaviours. These traits mediate fish population responses to changing environmental conditions such as those caused by anthropogenic stressors. The Conasauga River, located in northwestern Georgia and southeastern Tennessee, USA, hosts a diverse assemblage of over 75 species of freshwater fish, some of which are locally or regionally endemic, and many of which are imperilled. Annual monitoring data have shown population declines in multiple fish species of conservation concern in the Conasauga River since at least the 1990s, raising the possibility that other taxa could be declining as well. We quantified temporal changes in fish communities at six shoal sites sampled annually in most years from 1996 to 2022, and asked whether species traits hypothesized to underlie population vulnerability to environmental alteration were correlated with species‐specific trends for 32 taxa. We estimated that total counts of fish in annual samples declined by ~2% per year, although declines were uneven among species and generally greater for less abundant taxa. Tests for species traits corresponding to temporal population trends provided evidence that crevice‐spawning minnows and smaller‐bodied taxa had steeper declines compared with broadcast spawners and larger, longer‐lived, more fecund taxa. Lower abundance, reliance on a particular habitat feature, and life‐history traits that may limit population resilience to disturbance may all prove useful for identifying riverine fishes at particular risk of future population decline.","PeriodicalId":507419,"journal":{"name":"Ecology of Freshwater Fish","volume":"286 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139799369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1