Palavras-chave: zooplâncton, estuário, rio Siriji, variação sazonal. SEASONAL VARIATION OF MACROZOOPLANKTON IN THE ESTUARY OF THE SIRIJI RIVER, NORTHERN COAST OF PERNAMBUCO -BRAZIL ABSTRACTThe present work aimed at characterizing the seasonal variation of the macrozooplankton in the estuary of the Siriji river, northern coast of Pernambuco. The collections were taken respectively, in May and December 2004, which are included within the rainy and dry seasons. Plankton samples were collected with a 300 µm mesh size net, coupled with a flowmeter for measuring the amount of filtered water. The haulings were accomplished at water surface and above bottom. The transformed values (log 2 (x + 1)) of the average density in the rainy season varied from 8.24 to 9.35 ind.m -3 at the surface, and 8.71 to 9.47 ind.m -3 at the bottom. In the dry season, these values varied between 7.90 and 9.44 ind.m -3 at the surface, and 4.16 and 9.72 ind.m -3 at the bottom. The most relevant organisms were Oikopleura dioica, Oikopleura spp., Acartia lilljeborgi, Grapsidae/Ocypodidae/Majidae (zoeae I) and Pseudodiaptomus acutus. Species diversity and evenness were higher in May (rainy period). Some samples presented low evenness values (inferior to 0.5), what can indicate that the zooplankton community has been subject to some unbalance as a consequence of habitat modification.Keywords: zooplankton, estuary, Siriji river, seasonal variation. INTRODUÇÃOAs áreas estuarinas com seus manguezais associados constituem um dos ecossistemas mais produtivos do mundo, incorporando uma rede balanceada de interrelações bióticas e abióticas. Este balanço natural vem sendo modificado nos últimos anos
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