Recruitment is the addition of new individuals to a population and it can contribute to the high variability at local populations structure in marine environments. To mobile epibenthic species, recruitment may be indicated by changes on behavior or habitat and habitat selection can be affected by life and feeding habits, as well as predation risk. Also, development mode may directly influence spatial distribution of marine invertebrates. Peracarid crustaceans dominate several intertidal macroalgae, show a wide array of lifestyles and their development is exclusively direct. Juveniles grow into the female marsupium and their initial dispersal and recruitment is poorly known. Two amphipod species with contrasting lifestyles and mobility and highly abundant at Sargassum beds from northern Sao Paulo shores were selected for this study. Cymadusa filosa is a tube-dwelling and sedentary species patchily distributed, reaching bigger size when compared to Hyale niger. This hyalid is a free-living species and thus, can search for different food and shelter sites, although being more vulnerable to visually oriented predators. Amphipods are an ecologically important group mainly by their abundance and the link between pelagic and benthonic environments through nutrients cycling. In this way, evaluate the dispersive potential and recruitment of these species will allow the understanding of intra and interspecific relations and undergoing processes at phytal community dynamics.
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