Abstract

GARCIA-HUIDOBRO, M. Roberto; PULGAR AGUILA, José Miguel; PULGAR AGUILA, Víctor Manuel  and  ALDANA, Marcela. Impact of predators and resource abundance levels on physiological traits of Fissurella crassa (Archeogastropoda). Hidrobiológica [online]. 2015, vol.25, n.2, pp.165-173. ISSN 0188-8897.

The effects of predators on the density of prey and their resources have been widely studied; however, there is little evidence on the effects of the predators in conjunction with the availability of resources on the traits of the prey, which could affect foraging activities. In this study, the physiological state and the escape response of the intertidal herbivore Fissurella crassa were evaluated in two sites which differ in terms of the abundance of its predator Heliaster helianthus. The results suggest that the escape response of F. crassa in the site with greater predator density and lower resource availability could require a better body condition that is compensated with increments in foraging. The results highlight the need to address the physiological perspective in community ecology in order to understand the interactions within these communities.

Keywords : Foraging activity; Heliaster helianthus; intermareal; measured through traits; scape response.