Artículos de revistas
Trophic niche overlap between two Chilean endemic species of Trichomycterus (Teleostei: Siluriformes)
Fecha
2007Registro en:
Revista Chilena de Historia Natural, Volumen 80, Issue 4, 2018, Pages 431-437
07176317
0716078X
10.4067/S0716-078X2007000400004
Autor
Scott, Sergio
Pardo, Rodrigo
Vila Pinto, Irma
Institución
Resumen
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 it