Variação sazonal da fauna vágil de Sargassum stenophyllum (Martens) em duas estações com diferentes graus de exposicäo às ondas, em Ibicuí, Baía de Sepetiba, estado do Rio de Janeiro, Brasil / Seasonal variation of the vagile fauna of Sargassum stenophyllum (Martens) at two stations with different intensity of wave exposure in Ibicuí, Rio de Janerio State, Brazil

The seasonal variation of the vagile fauna associated to Sargassum stenophyllum was analyzed from March/1986 to February/1987. The samples were obtained at two stations with differents intensity of wave exposures. Hight density of nematods and amphipods were observed during all of sampling period. Gammarids seems to be more dominant on the exposure site, while nematods, polychaetes and mollusks do on the sheltered one.