Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream

We examined seasonal and diel variation in prey species composition and biomass in the diet of the exotic rainbow trout Oncorhynchus mykiss (Walbaum, 1972). The study was carried out in the upper-forested sections of a low order stream in Andean-Patagonia. We studied the importance of functional fee...

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Autores principales:	BURIA,LEONARDO M, ALBARIÑO,RICARDO J, MODENUTTI,BEATRIZ E, BALSEIRO,ESTEBAN G
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2009
Materias:	allochthonous plant detritus fish predation terrestrial and aquatic prey functional feeding groups
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000100001
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spelling	oai:scielo:S0716-078X20090001000012009-07-29Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied streamBURIA,LEONARDO MALBARIÑO,RICARDO JMODENUTTI,BEATRIZ EBALSEIRO,ESTEBAN G allochthonous plant detritus fish predation terrestrial and aquatic prey functional feeding groups We examined seasonal and diel variation in prey species composition and biomass in the diet of the exotic rainbow trout Oncorhynchus mykiss (Walbaum, 1972). The study was carried out in the upper-forested sections of a low order stream in Andean-Patagonia. We studied the importance of functional feeding groups of aquatic invertebrates and the relative contribution of terrestrial and aquatic prey items in order to assess the pathways connecting terrestrial and aquatic ecosystems along a stream food web. Trout fed on approximately 40 invertebrate species and scrapers were consistently selected, suggesting their increased vulnerability to predation. However in terms of biomass, rainbow trout diet was mostly composed by shredders which emphasized the role of the allochthonous plant detritus pathway in food webs of forested small streams. Trout individuals fed more intensively in spring and summer and during daytime. Terrestrial items constituted a minor proportion of the diet implying that this component did not represent a significant subsidy for this fish population. As a consequence, the top-down effect on the aquatic community does not appear to be dampened since trout do not strongly preyed on terrestrial invertebrates.info:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.82 n.1 20092009-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000100001en10.4067/S0716-078X2009000100001
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	allochthonous plant detritus fish predation terrestrial and aquatic prey functional feeding groups
spellingShingle	allochthonous plant detritus fish predation terrestrial and aquatic prey functional feeding groups BURIA,LEONARDO M ALBARIÑO,RICARDO J MODENUTTI,BEATRIZ E BALSEIRO,ESTEBAN G Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream
description	We examined seasonal and diel variation in prey species composition and biomass in the diet of the exotic rainbow trout Oncorhynchus mykiss (Walbaum, 1972). The study was carried out in the upper-forested sections of a low order stream in Andean-Patagonia. We studied the importance of functional feeding groups of aquatic invertebrates and the relative contribution of terrestrial and aquatic prey items in order to assess the pathways connecting terrestrial and aquatic ecosystems along a stream food web. Trout fed on approximately 40 invertebrate species and scrapers were consistently selected, suggesting their increased vulnerability to predation. However in terms of biomass, rainbow trout diet was mostly composed by shredders which emphasized the role of the allochthonous plant detritus pathway in food webs of forested small streams. Trout individuals fed more intensively in spring and summer and during daytime. Terrestrial items constituted a minor proportion of the diet implying that this component did not represent a significant subsidy for this fish population. As a consequence, the top-down effect on the aquatic community does not appear to be dampened since trout do not strongly preyed on terrestrial invertebrates.
author	BURIA,LEONARDO M ALBARIÑO,RICARDO J MODENUTTI,BEATRIZ E BALSEIRO,ESTEBAN G
author_facet	BURIA,LEONARDO M ALBARIÑO,RICARDO J MODENUTTI,BEATRIZ E BALSEIRO,ESTEBAN G
author_sort	BURIA,LEONARDO M
title	Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream
title_short	Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream
title_full	Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream
title_fullStr	Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream
title_full_unstemmed	Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream
title_sort	temporal variations in the diet of the exotic rainbow trout (oncorhynchus mykiss) in an andean-patagonian canopied stream
publisher	Sociedad de Biología de Chile
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2009000100001
work_keys_str_mv	AT burialeonardom temporalvariationsinthedietoftheexoticrainbowtroutoncorhynchusmykissinanandeanpatagoniancanopiedstream AT albarinoricardoj temporalvariationsinthedietoftheexoticrainbowtroutoncorhynchusmykissinanandeanpatagoniancanopiedstream AT modenuttibeatrize temporalvariationsinthedietoftheexoticrainbowtroutoncorhynchusmykissinanandeanpatagoniancanopiedstream AT balseiroestebang temporalvariationsinthedietoftheexoticrainbowtroutoncorhynchusmykissinanandeanpatagoniancanopiedstream
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Temporal variations in the diet of the exotic rainbow trout (Oncorhynchus mykiss) in an Andean-Patagonian canopied stream

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