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Evidencia de solapamiento de micro-hábitat entre juveniles del salmón introducido Oncorhynchus tshawytscha y el pez nativo Trichomycterus areolatus en el río Allipén, Chile

2010; University of Valparaíso; Volume: 45; Issue: 2 Linguagem: Inglês

10.4067/s0718-19572010000200010

0718-1957

Pamela V. Vargas, Iván Arismendi, Gladys Lara, Javier Millar, Santiago Peredo,

Aquatic Invertebrate Ecology and Behavior

Introduced juvenile Chinook salmon (Oncorhynchus tshawytscha) have been found co-occurring with native fishes in the Allipén River, Chile.Due to this co-occurence, the microhabitat use, microhabitat preferences, and overlap between juvenile Chinook salmon and the native catfish, Trichomycterus areolatus, were examined during the summer and fall of 2007-2008.Microhabitat preferences and overlap between juvenile Chinook salmon and the native catfish were determined using the Instream Flow Incremental Methodology and the Pianka´s index.Juvenile Chinook salmon and the native catfish microhabitat preferences varied seasonally showing a high degree of similarity and overlap between the species (higher than 80%).The results suggest the risk of negative interactions and interactive segregation over habitat processes between juvenile Chinook salmon and native catfish.As a consequence, the Chinook salmon invasion may threaten the stability of native catfish populations at Allipén River.