Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey

The feeding ecology of farmed fish escapees has seldom been assessed, although they are one of aquaculture’s main environmental impacts. Here we tested if the diet of Oncorhynchus mykiss rainbow trout escapees was affected by their dispersal from farms in a reservoir in Argentine Patagonia by combin...

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Autores principales:	Nabaes Jodar, Diego Nicolás, Cussac, Victor Enrique, Becker, Leandro Anibal
Formato:	Articulo article acceptedVersion
Lenguaje:	Inglés
Publicado:	Springer 2019
Materias:	Farm escapees Feeding behavior Freshwater aquaculture Oncorhynchus mykiss Stable isotopes Stomach contents Ciencias de la Tierra y Medio Ambiente
Acceso en línea:	http://rdi.uncoma.edu.ar/handle/uncomaid/17159
Aporte de:	Repositorio Institucional UNCo de Universidad Nacional del Comahue

id	I22-R178-uncomaid-17159
record_format	dspace
spelling	I22-R178-uncomaid-171592023-10-11T17:18:40Z Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey Nabaes Jodar, Diego Nicolás Cussac, Victor Enrique Becker, Leandro Anibal Farm escapees Feeding behavior Freshwater aquaculture Oncorhynchus mykiss Stable isotopes Stomach contents Ciencias de la Tierra y Medio Ambiente The feeding ecology of farmed fish escapees has seldom been assessed, although they are one of aquaculture’s main environmental impacts. Here we tested if the diet of Oncorhynchus mykiss rainbow trout escapees was affected by their dispersal from farms in a reservoir in Argentine Patagonia by combining stomach content and stable isotope data, and compared their spatial patternswith those of caged and wild (previously naturalized) conspecifics. Our results reveal a shift in the stomach content and d13C values of escapees, reflecting a farm (pellets) to wild (mainly Daphnia sp.) diet transition associated to dispersal from farms. The d13C signal of escapees sampled within the farming area was close to that of caged fish, whereas the d13C of escapees captured far from it was indistinguishable from that of wild rainbow trout. Furthermore, escapee dispersal from farms was associated with a transition from indiscriminate surface feeding (on indigestible floating items) typical of caged fish to preying heavily on Daphnia sp. In contrast, wild fish diet was homogeneous across all sites. Farm escapees gradually acquiring the feeding behavior of their wild conspecifics as they disperse from the farms may promote competition for food and space, and increase their chances for survival in the wild. Fil: Nabaes Jodar, Diego Nicolás. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Fil: Nabaes Jodar, Diego Nicolás. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Andino Patagónico de Tecnologías Biológicas y Geoambientales; Argentina. Fil: Cussac, Victor Enrique. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Fil: Cussac, Victor Enrique. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto Andino Patagónico de Tecnologías Biológicas y Geoambientales; Argentina. Fil: Becker, Leandro Anibal. Universidad Nacional del Comahue. Centro Regional Universitario Bariloche; Argentina. Fil: Becker, Leandro Anibal. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Diversidad y Evolución Austral; Argentina. 2019-10-23 2023-05-15T15:52:37Z 2023-05-15T15:52:37Z Articulo article acceptedVersion 1573-5117 http://rdi.uncoma.edu.ar/handle/uncomaid/17159 eng https://link.springer.com/article/10.1007/s10750-019-04075-2 Atribución-NoComercial-CompartirIgual 2.5 Argentina https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ application/pdf pp. 105-120 application/pdf Springer Hydrobiologia. Núm. 847 (2020)
institution	Universidad Nacional del Comahue
institution_str	I-22
repository_str	R-178
collection	Repositorio Institucional UNCo
language	Inglés
topic	Farm escapees Feeding behavior Freshwater aquaculture Oncorhynchus mykiss Stable isotopes Stomach contents Ciencias de la Tierra y Medio Ambiente
spellingShingle	Farm escapees Feeding behavior Freshwater aquaculture Oncorhynchus mykiss Stable isotopes Stomach contents Ciencias de la Tierra y Medio Ambiente Nabaes Jodar, Diego Nicolás Cussac, Victor Enrique Becker, Leandro Anibal Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
topic_facet	Farm escapees Feeding behavior Freshwater aquaculture Oncorhynchus mykiss Stable isotopes Stomach contents Ciencias de la Tierra y Medio Ambiente
description	The feeding ecology of farmed fish escapees has seldom been assessed, although they are one of aquaculture’s main environmental impacts. Here we tested if the diet of Oncorhynchus mykiss rainbow trout escapees was affected by their dispersal from farms in a reservoir in Argentine Patagonia by combining stomach content and stable isotope data, and compared their spatial patternswith those of caged and wild (previously naturalized) conspecifics. Our results reveal a shift in the stomach content and d13C values of escapees, reflecting a farm (pellets) to wild (mainly Daphnia sp.) diet transition associated to dispersal from farms. The d13C signal of escapees sampled within the farming area was close to that of caged fish, whereas the d13C of escapees captured far from it was indistinguishable from that of wild rainbow trout. Furthermore, escapee dispersal from farms was associated with a transition from indiscriminate surface feeding (on indigestible floating items) typical of caged fish to preying heavily on Daphnia sp. In contrast, wild fish diet was homogeneous across all sites. Farm escapees gradually acquiring the feeding behavior of their wild conspecifics as they disperse from the farms may promote competition for food and space, and increase their chances for survival in the wild.
format	Articulo article acceptedVersion
author	Nabaes Jodar, Diego Nicolás Cussac, Victor Enrique Becker, Leandro Anibal
author_facet	Nabaes Jodar, Diego Nicolás Cussac, Victor Enrique Becker, Leandro Anibal
author_sort	Nabaes Jodar, Diego Nicolás
title	Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
title_short	Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
title_full	Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
title_fullStr	Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
title_full_unstemmed	Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
title_sort	into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey
publisher	Springer
publishDate	2019
url	http://rdi.uncoma.edu.ar/handle/uncomaid/17159
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Into the wild : escaped farmed rainbow trout show a dispersal-associated diet shift towards natural prey

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