Ecological variation in invasive brown trout (Salmo trutta) within a remote coastal river catchment in northern Patagonia complicates estimates of invasion impact

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dc.contributor.authorBahamonde, Paulina Andrea
dc.contributor.authorChiang, Gustavo
dc.contributor.authorMancilla, Gabriela
dc.contributor.authorContador, Tamara
dc.contributor.authorQuezada-Romegialli, Caudio
dc.contributor.authorMunkittrick, Kelly Roland
dc.contributor.authorHarrod, Chris
dc.date.accessioned2025-01-20T19:21:12Z
dc.date.available2025-01-20T19:21:12Z
dc.date.issued2024-01
dc.descriptionIndexación: Scopus
dc.description.abstractSalmonids were first introduced into the Chilean fresh waters in the 1880s, and c. 140 years later, they are ubiquitous across Chilean rivers, especially in the southern pristine fresh waters. This study examined the brown trout (Salmo trutta) and native taxa ecology in two adjacent but contrasting rivers of Chilean Patagonia. During spring 2016 and spring–fall 2017 we examined the variation in benthic macroinvertebrate and fish community composition and characterized fish size structure, stomach contents, and stable isotopes (δ13C and δ15N) to understand population structure, fish diet, and trophic interactions between S. trutta and native taxa. The native Galaxias maculatus (puye) dominated the fish community (74% of abundance). S. trutta was less abundant (16% of survey catch) but dominated the fish community (over 53%) in terms of biomass. S. trutta showed distinct diets (stomach content analysis) in the two rivers, and individuals from the larger river were notably more piscivorous, consuming native fish with a relatively small body size (<100-mm total length). Native fishes were isotopically distinct from S. trutta, which showed a wider isotopic niche in the smaller river, indicating that their trophic role was more variable than in the larger river (piscivorous). This study provides data from the unstudied pristine coastal rivers in Patagonia and reveals that interactions between native and introduced species can vary at very local spatial scales. © 2023 Fisheries Society of the British Isles.
dc.description.urihttps://onlinelibrary-wiley-com.recursosbiblioteca.unab.cl/doi/10.1111/jfb.15559
dc.identifier.citationJournal of Fish Biology. Volume 104, Issue 1, Pages 139 - 154. January 2024
dc.identifier.doi10.1111/jfb.15559
dc.identifier.issn0022-1112
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/63082
dc.language.isoen
dc.publisherJohn Wiley and Sons Inc
dc.subjectCommunity Structure
dc.subjectInvasive Fish Species
dc.subjectPatagonia
dc.subjectSalmonids
dc.subjectSpatial Variation
dc.subjectTrophic Ecology
dc.titleEcological variation in invasive brown trout (Salmo trutta) within a remote coastal river catchment in northern Patagonia complicates estimates of invasion impact
dc.typeArtículo
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