Pablo Ezequiel Reggi, María Gabriela Otturi, Miguel Ángel Battini, Juan Pablo Barriga
{"title":"Feeding performance superiority of non-native salmonids over a native Patagonian fish","authors":"Pablo Ezequiel Reggi, María Gabriela Otturi, Miguel Ángel Battini, Juan Pablo Barriga","doi":"10.1007/s10750-024-05651-x","DOIUrl":null,"url":null,"abstract":"<p>Our objective was to assess the effects of interactions between the native <i>Percichthys trucha</i> and both <i>Salmo trutta</i> and <i>Oncorhynchus mykiss</i> during the juvenile period. We conducted single and multipredator (conspecific and heterospecific) functional response (FR) experiments with <i>Meridialaris chiloeensis</i> as native prey and estimated the functional response ratio as a predator impact metric. Our results showed that all species have type II FR, with salmonids having a greater impact on prey than native fish. In multipredator experiments, <i>O. mykiss</i> had a greater negative impact on <i>P. trucha</i> than <i>S. trutta</i>. The individual feeding performance of <i>P. trucha</i> was better under conspecific than heterospecific conditions. This study shows that the vulnerability of juvenile <i>P. trucha</i> to salmonid competition could be a real threat in Patagonian lotic environments.</p>","PeriodicalId":13147,"journal":{"name":"Hydrobiologia","volume":"133 1","pages":""},"PeriodicalIF":2.2000,"publicationDate":"2024-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Hydrobiologia","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.1007/s10750-024-05651-x","RegionNum":3,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Our objective was to assess the effects of interactions between the native Percichthys trucha and both Salmo trutta and Oncorhynchus mykiss during the juvenile period. We conducted single and multipredator (conspecific and heterospecific) functional response (FR) experiments with Meridialaris chiloeensis as native prey and estimated the functional response ratio as a predator impact metric. Our results showed that all species have type II FR, with salmonids having a greater impact on prey than native fish. In multipredator experiments, O. mykiss had a greater negative impact on P. trucha than S. trutta. The individual feeding performance of P. trucha was better under conspecific than heterospecific conditions. This study shows that the vulnerability of juvenile P. trucha to salmonid competition could be a real threat in Patagonian lotic environments.
期刊介绍:
Hydrobiologia publishes original research, reviews and opinions regarding the biology of all aquatic environments, including the impact of human activities. We welcome molecular-, organism-, community- and ecosystem-level studies in contributions dealing with limnology and oceanography, including systematics and aquatic ecology. Hypothesis-driven experimental research is preferred, but also theoretical papers or articles with large descriptive content will be considered, provided they are made relevant to a broad hydrobiological audience. Applied aspects will be considered if firmly embedded in an ecological context.