Ecology of Freshwater Fish最新文献_第9页

Freshwater fish as hosts for parasites in Australia: How much do we really know? 淡水鱼是澳大利亚寄生虫的宿主：我们真正了解多少？

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-10-04 DOI: 10.1111/eff.12754

Diane P. Barton, Shokoofeh Shamsi

{"title":"Freshwater fish as hosts for parasites in Australia: How much do we really know?","authors":"Diane P. Barton, Shokoofeh Shamsi","doi":"10.1111/eff.12754","DOIUrl":"10.1111/eff.12754","url":null,"abstract":"Australia has a highly endemic freshwater fish fauna, but basic biological knowledge for most is lacking. This includes an understanding, and description, of their parasite fauna. Additionally, the impacts of introduced fish species, and their parasites which have transferred across to native species, are also mostly unknown. This review provides the current level of knowledge of parasitic infection of the freshwater fish in Australia, both introduced and native. Only about a third of the native freshwater fish, but almost two-thirds of introduced fish, have been reported as a host for a parasite. The majority of records occur along the eastern coastline of Australia and throughout the Murray Darling Basin; two drainage regions were yet to record any parasite infections. Of the 124 fish species, across 43 families, found as hosts in Australia, only 11 species had more than 10 reports of infection, with 31% of fish species only having single reports. A total of 13 different types of parasites were reported, with digeneans, protozoans, nematodes and monogeneans the most commonly reported. Significant gaps in the knowledge of parasites, and their potential impacts, of Australian freshwater fish still exist, and the need for fish biologists and fish parasitologists to work together is highlighted to ensure that as much information about each group can be obtained.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12754","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135548355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Can non-native perch (Perca fluviatilis) support native eel populations in a wetland complex? 非本地鲈鱼（Perca fluviatilis）能否支持湿地群中的本地鳗鱼种群？

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-26 DOI: 10.1111/eff.12749

Cohen Stewart, Blake Harper, Jayde Couper, Sarah J. Bury, Amandine Sabadel

{"title":"Can non-native perch (Perca fluviatilis) support native eel populations in a wetland complex?","authors":"Cohen Stewart, Blake Harper, Jayde Couper, Sarah J. Bury, Amandine Sabadel","doi":"10.1111/eff.12749","DOIUrl":"10.1111/eff.12749","url":null,"abstract":"It is well established that non-native fish can become invasive and outcompete and displace native fish populations. However, little research has explored the potential benefits that non-native fish may provide to native fish populations. To address this information gap, we examined how the availability of non-native perch (Perca fluviatilis) as prey could benefit populations of the endemic longfin eel (Anguilla dieffenbachii) and the native shortfin eel (Anguilla australis) in two neighbouring open-water wetlands in the Rakatu-Redcliff wetland complex in the Southland region of Aotearoa New Zealand. The Redcliff wetland fish community comprised native fish only, while the Rakatu wetland comprised native fish and non-native perch. We compared the size, condition, population density, population size structure and diet of eels in these wetlands. While eels were not necessarily larger or better conditioned in Rakatu wetland, their population density was three times higher than the Redcliff wetland, with young-of-the-year perch comprising ca. 40% of their diet. Furthermore, juvenile eel density was four times lower in Redcliff wetland, suggesting that cannibalism may occur at this site to support the existing eel population. Based on our findings, we suggest that freshwater managers consider the predator–prey dynamics of both native and non-native fish before removing non-native species, to avoid unintended negative consequences for native predatory fish species.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134961086","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}

引用次数: 0

Smolting in post-sexually mature male Atlantic salmon (Salmo salar L.) parr in the wild 野外性成熟后雄性大西洋鲑（Salmo salar L.）小鱼的蜕皮现象

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-24 DOI: 10.1111/eff.12755

Angus J. Lothian, Jessica Rodger, Lorna Wilkie, Marcus Walters, Richard Miller, Chris Conroy, Shona Marshall, Morven MacKenzie, Colin E. Adams

{"title":"Smolting in post-sexually mature male Atlantic salmon (Salmo salar L.) parr in the wild","authors":"Angus J. Lothian, Jessica Rodger, Lorna Wilkie, Marcus Walters, Richard Miller, Chris Conroy, Shona Marshall, Morven MacKenzie, Colin E. Adams","doi":"10.1111/eff.12755","DOIUrl":"10.1111/eff.12755","url":null,"abstract":"Conflicts can arise in developmental pathways that prevent an individual entering different developmental life stages that result in the expression of different phenotypes within a specific time period. In salmonids, theory suggests that sexual maturation may inhibit subsequent smolting within the same 12-month period and that this is partly the result of the time and the apparently conflicting physiological changes for these processes to occur, and partly because of the energy requirements for these physiologically taxing processes. This study tested whether sexually mature male Atlantic salmon (Salmo salar L.) parr, caught in the autumn, would subsequently smolt the following spring. Through individual identification using PIT telemetry, minimum estimates of 3.0% (n = 6/203) and 5.9% (n = 1/17) of Atlantic salmon parr that were sexually mature in two river catchments during the autumn were subsequently identified as smolts in the following spring. We therefore suggest that, in line with previous studies on domesticated Atlantic salmon and laboratory-based experiments, there is no developmental conflict but that life-history expression is mediated by environmental and genetic processes.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12755","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135924327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Diets of invasive channel catfish are subsidized by invasive riparian trees 外来河道鲶鱼的食物得到外来河岸树木的补贴

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-24 DOI: 10.1111/eff.12753

Christopher A. Cheek, Brandon K. Peoples, Reuben R. Goforth

{"title":"Diets of invasive channel catfish are subsidized by invasive riparian trees","authors":"Christopher A. Cheek, Brandon K. Peoples, Reuben R. Goforth","doi":"10.1111/eff.12753","DOIUrl":"10.1111/eff.12753","url":null,"abstract":"Russian olive (Elaeagnus angustifolia) is an invasive, fruit-bearing riparian tree that dominates riparian zones of the San Juan River in the southwestern United States. Previous research in this river suggests olive fruit is common in diets of invasive channel catfish (Ictalurus punctatus), but its energetic importance is unknown (i.e. critical for catfish fitness vs. incidental consumption). We assessed Russian olive consumption in channel catfish diets bimonthly for 1 year, hypothesizing that olive consumption would be greatest during periods of high olive availability and low benthic aquatic invertebrate availability. We found that catfish consumed olive fruit throughout the year and that olive comprised up to 44% of total stomach contents by mass, with peaks in spring and fall. Regression models revealed the presence and mass of olive fruit in catfish stomachs were positively associated with catfish total length, with a significant interaction between water temperature and river discharge. Catfish were more likely to consume olive fruit during higher flows, regardless of temperature and at low discharge with higher temperature. Contrary to our hypothesis, neither olive nor benthic invertebrate availability were associated with olive presence in channel catfish diets. Nutrition analysis indicated that olive alone was a low-quality diet item but has the potential to provide a reliable energy source. We used seasonal data to estimate the energetic contribution of olive fruit to catfish populations using a bioenergetic model, which estimated that olive fruit accounted for 35.6% of energy (Joules) consumed by catfish populations and satisfied 38% of their metabolic demand. Our results suggest that Russian olive fruit is a significant subsidy to channel catfish in the San Juan River. However, more research is needed to determine the indirect effects of this interaction on native fishes and ecosystem function.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12753","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135925646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Facilitation of benthic assemblages by Bluehead Chubs: Testing the stress-gradient hypothesis in streams 蓝头鲦对底栖生物组合的促进作用：测试溪流中的压力梯度假说

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-24 DOI: 10.1111/eff.12748

Isabel G. Evelyn, John C. Morse, Brandon K. Peoples

{"title":"Facilitation of benthic assemblages by Bluehead Chubs: Testing the stress-gradient hypothesis in streams","authors":"Isabel G. Evelyn, John C. Morse, Brandon K. Peoples","doi":"10.1111/eff.12748","DOIUrl":"10.1111/eff.12748","url":null,"abstract":"Ecosystem engineers facilitate beneficiary species by ameliorating physical habitat. The stress-gradient hypothesis (SGH) predicts the importance of facilitation in communities should increase with physical stress but has rarely been tested in freshwater. Bluehead Chubs (Nocomis leptocephalus) build gravel nests for spawning, which can reduce negative effects of sedimentation for lithophilic species including invertebrates and other taxa. Our goal was to test the SGH using chubs and benthic assemblages as a model system. We surveyed assemblages in chub nests, paired unmodified substrate and reach-wide samples in 10 Piedmont streams in South Carolina, USA, placed across a gradient of sedimentation. Based on the SGH, we predicted benthic assemblage diversity in chub nests would show no relationship to increasing embeddedness but that diversity in unmodified substrate should decrease with embeddedness. We found that taxa counts, richness and Shannon diversity were higher in chub nests than unmodified substrate but were lower than reach-wide samples. Canonical correspondence analyses indicated benthic assemblages differed between nests and unmodified substrate, but assemblages in both microhabitats were nested subsets of the more diverse reach-wide assemblage. Contrary to our hypotheses, diversity in both microhabitats decreased significantly with substrate embeddedness but was consistently higher in nests. While substrate modification by chubs clearly facilitated benthic diversity at the microhabitat scale, it was not sufficient to overcome the worst effects of sedimentation. This study provides mixed evidence for SGH in streams; chub nesting appears to be facilitative at the microhabitat scale but may not have reach-wide effects on benthic assemblages in this system.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12748","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135924986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Detection efficiency of adult Pacific lamprey passage counts at Leaburg Dam and upstream distribution in the McKenzie River (Oregon, USA) 利堡大坝太平洋灯鱼成鱼通过计数的检测效率以及麦肯齐河（美国俄勒冈州）的上游分布情况

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-18 DOI: 10.1111/eff.12751

Jeremy D. Romer, Benjamin J. Clemens, Jeffrey S. Ziller, Emma Garner

{"title":"Detection efficiency of adult Pacific lamprey passage counts at Leaburg Dam and upstream distribution in the McKenzie River (Oregon, USA)","authors":"Jeremy D. Romer, Benjamin J. Clemens, Jeffrey S. Ziller, Emma Garner","doi":"10.1111/eff.12751","DOIUrl":"10.1111/eff.12751","url":null,"abstract":"Adult Pacific lamprey (Entosphenus tridentatus) were counted using consistent methodology since 2005 with a video monitoring system as they passed Leaburg Dam (McKenzie River, Oregon, USA) en route to upstream spawning areas. In this study we evaluated the detection efficiency of the video system and upstream distribution of Pacific lamprey using the video counts of lamprey passage (herein, “dam counts”), passive integrated transponder (PIT) tags, and radio telemetry. In 2019–2020 we collected, tagged and tracked 32 adult lamprey (4 from the McKenzie River and 28 that were translocated from Willamette Falls). All fish were tagged and released into the tailrace of Leaburg Dam in June 2019. Oregon Department of Fish and Wildlife employees and volunteers from the local community conducted mobile radiotracking above and below the dam in drift boats (114 mainstem river kilometers) and on foot (several tributaries). The estimated detection efficiency for dam counts was 92% (95% confidence interval: 67%–99%). Fifty percent (16 of 32) of the tagged lamprey passed the dam, including 13 of 28 that were translocated. Thirty-seven percent (6 of 16) of lamprey that passed Leaburg Dam were detected in a restored reach of the South Fork McKenzie, 32.6 river kilometers upstream of the dam.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135203270","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}

引用次数: 0

Do predator odours and warmer winters affect growth of salmonid embryos? 捕食者气味和温暖的冬季是否会影响鲑鱼胚胎的生长？

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-13 DOI: 10.1111/eff.12747

Karl Filipsson, Ann Erlandsson, Larry Greenberg, Martin Österling, Johan Watz, Eva Bergman

{"title":"Do predator odours and warmer winters affect growth of salmonid embryos?","authors":"Karl Filipsson, Ann Erlandsson, Larry Greenberg, Martin Österling, Johan Watz, Eva Bergman","doi":"10.1111/eff.12747","DOIUrl":"10.1111/eff.12747","url":null,"abstract":"Conditions early in ontogeny can have considerable effects later on in life. Many salmonids spawn during the autumn, and temperature during subsequent embryogenesis may have far‐reaching effects on life‐history traits, especially when considering ongoing climate change. Even biotic conditions during embryogenesis, such as predation threat, may affect later life stages. Here, we examined how predator odours and increased temperatures affect embryonic growth and development of a fish (brown trout Salmo trutta). We found that embryos had lower body mass and greater yolk volume close to hatching when subjected to predator odours. Trout embryos incubated at temperatures representing natural winter conditions were larger than embryos incubated at higher temperatures, although the latter hatched earlier. Fry sizes at emergence did not differ between treatments, perhaps because of compensatory growth during spring. This study shows that predator presence can have similar effects on embryonic growth of salmonids as warming winters, with possible impact later in ontogeny.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12747","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135740711","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Metacommunity organisation of Amazonian stream fish assemblages: The importance of spatial and environmental factors 亚马逊溪流鱼群的元群落组织：空间和环境因素的重要性

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-09-13 DOI: 10.1111/eff.12750

André Ribeiro Martins, Douglas Aviz Bastos, Leandro Melo Sousa, Tommaso Giarrizzo, Thiago Bernardi Vieira, Luiz Ubiratan Hepp

{"title":"Metacommunity organisation of Amazonian stream fish assemblages: The importance of spatial and environmental factors","authors":"André Ribeiro Martins, Douglas Aviz Bastos, Leandro Melo Sousa, Tommaso Giarrizzo, Thiago Bernardi Vieira, Luiz Ubiratan Hepp","doi":"10.1111/eff.12750","DOIUrl":"10.1111/eff.12750","url":null,"abstract":"Metacommunity theory seeks to explain how local and regional processes contribute to the organisation of biological communities. Recent conceptual frameworks of this theory indicate that the dynamics of populations and communities are jointly established by dispersal, species responses to environmental conditions and biotic interactions dependent on species density. Here, we use hierarchical joint species distribution modelling to verify the effects of environmental factors (at multiple spatial scales), drainage network configuration, spatial autocorrelation and interspecific interactions on the structure of fish assemblages in terra-firme streams in the Eastern Brazilian Amazon. Thirty streams were sampled in two field surveys, and 89 species were collected in total. Our results confirm the effects of limited dispersal, environmental conditions (at multiple scales) and the configuration of the drainage network on the dynamics of these assemblages. Furthermore, our results suggest that interspecific interactions are less relevant for the structuring of fish metacommunities in small Amazonian headwater streams. Abiotic factors like drainage networks and environmental heterogeneity were better predictors of species distributions than co-occurrence patterns with potential competitors or predators.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-09-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135735195","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}

引用次数: 0

Variable diet plasticity in Eurasian perch (Perca fluviatilis): Current versus seasonal food uptake 欧亚鲈鱼的可变饮食可塑性：当前与季节性食物摄入

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-08-24 DOI: 10.1111/eff.12746

Ivana Vejříková, Lukáš Vejřík, Martin Čech, Petr Blabolil, Jiří Peterka

{"title":"Variable diet plasticity in Eurasian perch (Perca fluviatilis): Current versus seasonal food uptake","authors":"Ivana Vejříková, Lukáš Vejřík, Martin Čech, Petr Blabolil, Jiří Peterka","doi":"10.1111/eff.12746","DOIUrl":"10.1111/eff.12746","url":null,"abstract":"Diet plasticity is often studied in Eurasian perch (Perca fluviatilis), a species commonly described as having generalist populations composed of specialised individuals. Perch diet was examined using gut content analysis (GCA) and stable isotope analysis (SIA), and individual specialisation was calculated in two study lakes within 2 years. Mostly only one diet category was present in the perch stomach, with more variation in the diet in the Most lake compared to the Milada lake between 2013 and 2014. The calculated degree of individual specialisation indicated higher specialisation in the Most lake. Interestingly, despite the different or almost uniform diet composition between the years, the total niche width (based on SIA) of the population remained similar in both lakes. This suggests that the overall variation in the sources utilised by the entire population remained consistent between the years. GCA mostly indicated zooplankton as the prevailing food source, whereas SIA indicated significant utilisation of YOY fish earlier that year, an information that was completely missed by the GCA of fish caught in September. The differences between GCA and SIA results could be attributed to the different time intervals reflected by the methods, but possibly to the conversion of the diet into the body tissues that is reflected by SIA and may depend on the diet's nutritional values rather than the proportion of different prey consumed.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"32 4","pages":"795-803"},"PeriodicalIF":1.8,"publicationDate":"2023-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12746","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49587352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Sex- and length-dependent variation in migratory propensity in brown trout 褐鳟洄游倾向的性别和长度依赖性变异

IF 1.8 3区农林科学

Ecology of Freshwater Fish Pub Date : 2023-08-19 DOI: 10.1111/eff.12745

Edward Lavender, Yannick Hunziker, Darryl McLennan, Philip Dermond, Dominique Stalder, Oliver Selz, Jakob Brodersen

{"title":"Sex- and length-dependent variation in migratory propensity in brown trout","authors":"Edward Lavender, Yannick Hunziker, Darryl McLennan, Philip Dermond, Dominique Stalder, Oliver Selz, Jakob Brodersen","doi":"10.1111/eff.12745","DOIUrl":"10.1111/eff.12745","url":null,"abstract":"In partially migratory species, individuals either migrate at some point(s) in life or reside within their natal habitat throughout life. For salmonid fish, migration creates opportunities for feeding and growth, but it is also associated with increased mortality risk. Such trade-offs likely differ between the sexes, since reproductive output is more closely tied to body size in females than males. However, testing hypotheses on sex-specific migratory behaviour in would-be first-time migratory salmonids is difficult, since sexes are generally morphologically indistinguishable prior to maturation. Previous studies have evaluated the influence of sex on migration based on dissection of migratory juveniles or the sex ratio of returning adults. However, both approaches are potentially biased by differential survival during migration. Here, we utilise advances in minimally invasive genetic sex-determination methods for salmonids to investigate sex-specific, spring out-migration propensity in potamodromous brown trout (Salmo trutta) in a pre-Alpine, central European lake. We show that there are marked differences in migratory behaviour between males and females, with small (~10 cm) females being approximately twice as likely to migrate out of their natal river in spring compared to similarly sized males, which generally migrate for the first time at larger sizes (in similar proportions to larger females). This study highlights how novel genetic sex-determination techniques can provide insight into the sex- and size-specific life-history trade-offs that shape migration propensity. Moving forward, these techniques should become useful tools for ecologists and fisheries managers.","PeriodicalId":11422,"journal":{"name":"Ecology of Freshwater Fish","volume":"33 1","pages":""},"PeriodicalIF":1.8,"publicationDate":"2023-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1111/eff.12745","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45033247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0