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Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes) RChHN
SCOTT,SERGIO; PARDO,RODRIGO; VILA,IRMA.
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....
Tipo: Journal article Palavras-chave: Diet; Sympatry; Trichomycterus areolatus; Trichomycterus chiltoni.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2007000400004
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