Abstract
Ecological studies including occurrence, relative abundance and spatial distribution of 15 species of Brachyura, as well as the fluctuation in the annual cycle are carried out in mangrove (27o 34' 14 and 27o 35' 31 L.S.; 48o 30' 07and 48o 31' 33 L. W.), during the year 1986. The hydrological parameters temperature, salinity and pH of surface and intersticial waters were also studied. Chasmagnathus granulata was the most abundant specie, followed by Uca uruguayensis, Aratus pisonii and Callinectes danae. The number of males was higher than females. In the spring a larger rate of Catches occurred. The species Eurytium limosum, Cardisoma guanhumi that had the state of Sao Paulo as their austral boundaru and Uca maracoani the state of Parana, have now their boundaries of distribution expanded is for as the City of Florianopolis, in the state of Santa Catarina.
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