The Mobile Fauna - Especially Gammaridea of Sargassum cymosum

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Abstract
The composition of the vagile fauna inhabiting the alga S. cymosum collected at 2 sites, differing in wave action, on the northern coast of Sao Paulo State, Brazil (23.degree.30''S and 45.degree.06''W) were compared. A total of 122,886 specimens were collated at 2 stations belonging to 23 taxonomic groups. Gammaridea comprised the dominant group at both sites: 16 spp. [Amphilochus neapolitanus, Ampithoe ramondi, Cymadusa ramondi, Sunamphithoe pelagica, Atylus minikoi, Aora atlantidea, Gammaropsis atlantica, Tethygeneia longleyi, Elasmopus pectinicrus, Hyale media, Hyale sp., Ericthonius brasiliensis, Jassa falcata, Leucothoe sp., Lysianassa sp., and Stenothoe valida] were recorded, among these 14 common spp. Water movement, even at the exposed shore, and sediment quantity of the sheltered site do not seem to affect gammaridean species variety. Species dominance throughout the year varied in exposed and sheltered localities. H. media was dominant at the exposed shore, and A. neapolitanus was the most abundant species at the sheltered shore.

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