Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)

Trichomycterus areolatus and Trichomycterus chiltoni are endemic siluriform fishes of Chile. They are the only Chilean species of this genus that live in sympatry and coexist in the Biobio basin. High trophic niche overlap between both species was found. Horn's index varied from 0.668 to 0.885...

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Autores principales:	SCOTT,SERGIO, PARDO,RODRIGO, VILA,IRMA
Lenguaje:	English
Publicado:	Sociedad de Biología de Chile 2007
Materias:	diet sympatry Trichomycterus areolatus Trichomycterus chiltoni
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400004
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spelling	oai:scielo:S0716-078X20070004000042008-03-18Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)SCOTT,SERGIOPARDO,RODRIGOVILA,IRMA diet sympatry Trichomycterus areolatus Trichomycterus chiltoni Trichomycterus areolatus and Trichomycterus chiltoni are endemic siluriform fishes of Chile. They are the only Chilean species of this genus that live in sympatry and coexist in the Biobio basin. High trophic niche overlap between both species was found. Horn's index varied from 0.668 to 0.885 among seasons, without significant differences, and Schoener's index varied from 0.639 to 0.912. Also the discriminant analysis showed no significant differences in prey item between the two species. Trophic composition of T. chiltoni and T. areolatus consisted mainly in chironomid larvae and other aquatic invertebrates. At all seasons T. chiltoni showed the greatest prey richness. Principal component analysis (PCA) showed a high similarity between diets of T. areolatus and T. chiltoni. These diet scores were significantly related with body size in T. chiltoni whereas T. areolatus showed a significant relationship with seasons. This may indicate a generalist strategy in T. areolatus by varying its diet in function of available prey items in each season, whereas T. chiltoni would be specialized in relation to individual size and intraspecific habitat partitioninginfo:eu-repo/semantics/openAccessSociedad de Biología de ChileRevista chilena de historia natural v.80 n.4 20072007-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400004en10.4067/S0716-078X2007000400004
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	diet sympatry Trichomycterus areolatus Trichomycterus chiltoni
spellingShingle	diet sympatry Trichomycterus areolatus Trichomycterus chiltoni SCOTT,SERGIO PARDO,RODRIGO VILA,IRMA Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
description	Trichomycterus areolatus and Trichomycterus chiltoni are endemic siluriform fishes of Chile. They are the only Chilean species of this genus that live in sympatry and coexist in the Biobio basin. High trophic niche overlap between both species was found. Horn's index varied from 0.668 to 0.885 among seasons, without significant differences, and Schoener's index varied from 0.639 to 0.912. Also the discriminant analysis showed no significant differences in prey item between the two species. Trophic composition of T. chiltoni and T. areolatus consisted mainly in chironomid larvae and other aquatic invertebrates. At all seasons T. chiltoni showed the greatest prey richness. Principal component analysis (PCA) showed a high similarity between diets of T. areolatus and T. chiltoni. These diet scores were significantly related with body size in T. chiltoni whereas T. areolatus showed a significant relationship with seasons. This may indicate a generalist strategy in T. areolatus by varying its diet in function of available prey items in each season, whereas T. chiltoni would be specialized in relation to individual size and intraspecific habitat partitioning
author	SCOTT,SERGIO PARDO,RODRIGO VILA,IRMA
author_facet	SCOTT,SERGIO PARDO,RODRIGO VILA,IRMA
author_sort	SCOTT,SERGIO
title	Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
title_short	Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
title_full	Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
title_fullStr	Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
title_full_unstemmed	Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
title_sort	trophic niche overlap between two chilean endemic species of trichomycterus (teleostei: siluriformes)
publisher	Sociedad de Biología de Chile
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400004
work_keys_str_mv	AT scottsergio trophicnicheoverlapbetweentwochileanendemicspeciesoftrichomycterusteleosteisiluriformes AT pardorodrigo trophicnicheoverlapbetweentwochileanendemicspeciesoftrichomycterusteleosteisiluriformes AT vilairma trophicnicheoverlapbetweentwochileanendemicspeciesoftrichomycterusteleosteisiluriformes
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Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)

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