Artículo
Diet of the exotic Rainbow Trout in the critical habitat of the threatened Hooded Grebe
Título:
Régime alimentaire de la truite arc-en-ciel introduite dans l’habitat essentiel du grèbe
mitré menacé
Fecha de publicación:
10/2015
Editorial:
EDP Sciences
Revista:
Knowledge and Management of Aquatic Ecosystems
ISSN:
1961-9502
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
The lakes of the basaltic plateaus of Patagonia represent the only reproductive habitat for the critically endangered Hooded Grebe (Podiceps gallardoi). More than 50 of these naturally fishless lakes have been stocked with the exotic Rainbow Trout (Oncorhynchus mykiss). While the available information suggests that the diet composition of trout and Hooded Grebes could overlap, to date no formal studies of the diet of Rainbow Trout in these aquatic environments have been published. We characterized the diet of trout in one of the primary reproductive areas of the Hooded Grebe based on the analysis of the gut contents of 177 individuals, from 9 lakes. Amphipods were clearly the most dominant group of prey, quantified as frequency of occurrence and proportion by weight. The condition factor of trout and the abundance of amphipods in the stomach contents showed a functional relationship, suggesting that the wellness of trout depends on the availability of this prey. Amphipods also represent a primary prey for the Hooded Grebe, suggesting a strong dietary overlap with the trout. The presence of trout may generate processes of competition that could affect the survival of the Hooded Grebe. This interaction may be particularly relevant in large vegetated lakes, where the Hooded Grebe reproduces.
Palabras clave:
AQUACULTURE
,
DIETARY OVERLAP
,
EXOTIC SPECIES
,
PATAGONIA
,
SPECIES INTERACTIONS
Archivos asociados
Licencia
Identificadores
Colecciones
Articulos(CCT-CENPAT)
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Articulos de CTRO.CIENTIFICO TECNOL.CONICET - CENPAT
Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
Lancelotti, Julio Lucio; Bandieri, Lucas Martín; Pascual, Miguel Alberto; Diet of the exotic Rainbow Trout in the critical habitat of the threatened Hooded Grebe; EDP Sciences; Knowledge and Management of Aquatic Ecosystems; 416; 26; 10-2015; 1-11
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