Cambios tamaño-dependientes en la dieta de peces marinos y su estudio mediante análisis de isótopos estables

摘要: Size-based dietary shifts in marine fishes assessed by stable isotopes analysis: Fish undergo significant morphological changes throughout their lives, like the relative length of digestive tube or increase mouth gape, and some them can lead to trophic level. Studying these is important understand fish trophodynamics, verify assumptions size-structured models assess community status analyzing size spectrum. In present study we evaluated positions four reef-fish from northern Patagonia: Pagrus pagrus, Diplodus argentus argentus, Pinguipes brasilianus Acanthistius patachonicus. Even though species share foraging areas had similar levels (trophic level ranged between 3.98 4.45), they exhibited specie-specific isotopic trends related body that could be meaning different behavior. While P. pagrus A. patachonicus presented an positively correlated with size, D. argenteus did not show any trend along ontogeny. These results highlight importance including identity models, as well acknowledge size-based feeding behavior might ubiquitous. However, support assumption maximum a increases, there are more probabilities size.