MACROINFAUNA INTERMAREAL DAS PRAIAS ARENOSAS DO LITORAL DE ARACAJU, SERGIPE, REGIÃO NORDESTE DO BRASIL = INTERTIDAL MACROINFAUNA OF THE ARACAJU SANDY BEACHES, SERGIPE, NORTHEASTERN BRAZIL
DOI :
https://doi.org/10.18764/1981-6421e2021.2Mots-clés :
bentos, número de espécies, abundância, morfodinâmica, região tropical = Keywords, benthos, number of species, abundance, morphodynamic, tropical regionRésumé
Praias arenosas são ambientes altamente dinâmicos que abrigam uma rica fauna adaptada às condições de instabilidade dos sedimentos. Nesse estudo, a estrutura e a composição da macrofauna de quatro praias arenosas do litoral de Aracaju (Sergipe, NE do Brasil) foram analisadas. As praias foram classificadas, em sua maioria, como dissipativas. O número total de espécies variou entre 14 e 17 espécies, enquanto que a densidade média total variou entre 65,50±9,29 e 169,50±30,52 indivíduos/m², sendo o bivalve Donax gemmula e os poliquetas Hemipodia californiensis e Orbinia sp. as espécies mais abundantes. Diferenças observadas na macrofauna provavelmente refletem os diferentes graus de urbanização e/ou intensidade de uso das praias analisadas. Quando comparado com outras praias do litoral sudeste e sul do Brasil, os valores de riqueza de espécies foram semelhantes, no entanto, os valores de densidade foram extremamente baixos, corroborando com o padrão latitudinal o qual prediz uma redução na abundância das espécies de zonas temperadas em direção à zona tropical.
ABSTRACT
Sandy beaches are highly dynamics environments which harbor a rich fauna adapted to sediment instability. In this study, the number of species and the density of the intertidal macrofauna of the four sandy beaches of the Aracaju coast (Sergipe, NE Brazil) were analyzed. The beaches were classified as dissipative. The number of species ranged from 14 to 17 species, whereas total density ranged from 65.50±9.29 to 169.50±30.52 individuals/m². The bivalve Donax gemmula and the polychaete Hemipodia californiensis and Orbinia sp. were the most abundant species. Observed differences in the intertidal macrofauna probably reflect the different urbanization levels and/or intensity of use of the analyzed beaches. When compared to others beaches of the southern/south region of the Brazil, the number of species values were quite similar. However, density values were extremely lower, corroborating with previous latitudinal patterns, where decrease in the macrofauna abundance from temperate to tropical beaches are expected.
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