Selectividad del alimento en dos peces bentofagos (Mugiloides chilensis y Calliclinus geniguttatus)

Prey electivity of two littoral fishes that belong to intermedial links of the trophic sub-web of the trophic sub-web of Caleta San Carlos, Corral bay is studied. Stomach content has been analyzed by mean of the numerical method and prey abundance in the environment has been evaluated with 0.1 m² samples, taken with SCUBA techniques. For each prey that's consumed by these fishes, Ivlev's electivity index was fitted; besides that, the correlation between food availability and the amount that is consumed by each of these predators was established. The results have been interpreted according to the behaviour of these fishes in relation to the top predator of the community. The results suggest that electivity has a component that's induced by the adaptive responde of these fishes with the top predator.