INVESTIGADORES
ANDERSON Christopher Brian
artículos
Título:
Niche overlap in sympatric introduced trout from a southern Patagonian river: evidence from stomach contents and stable isotope analysis
Autor/es:
HUNE, MATIAS; HARO, DANIELA; DAVIS, ERNESTO; GUTIÉRREZ, DAVID; ANDERSON, CHRISTOPHER B.; SABAT, PABLO
Revista:
Pan-American Journal of Aquatic Sciences
Editorial:
Pan-American Journal of Aquatic Sciences
Referencias:
Año: 2022 vol. 17 p. 304 - 311
ISSN:
1809-9009
Resumen:
We used a combination of stomach content and stable isotope analyses to assess thetrophic interactions and feeding habits of two different salmonid species, brown trout (Salmotrutta) and rainbow trout (Oncorhynchus mykiss) in the Serrano River (Magellan and theChilean Antarctic Region). We found a high dietary niche overlap, which was supported bySchoeners index and stable isotopes Bayesian ellipses. The diet was dominated by theamphipod Hyalella spp. in both species. Nonetheless, evidence suggests that O. mykiss has amore generalist feeding strategy than S. trutta. The dietary breadth indices and the isotopicniche area, which were broader for O. mykiss than S. trutta, supported this scenario. This studyincreases our understanding on the trophic relationships among these introduced troutcohabiting the river and their possible effects in freshwater ecosystems from southern Chile.
