VariaÃÃo espaÃo-temporal do microzooplÃncton no estuÃrio do rio Botafogo - PE

AUTOR(ES)

Tereza Manuela dos Santos Paes Barreto

DATA DE PUBLICAÇÃO

2009

RESUMO

The microzooplanktonic community has been recognized for a long time by its tremendous ecological importance in many aquatic ecosystems since they are capable of utilizing resources which are not available to the meso- and macrozooplanltonic fractions representing intermediates between the nano- and picoplankton and higher trophic levels. In estuarine environments these organisms have spatial and seasonal variations in terms of taxonomic composition and abundance, which are highly influenced by environmental changes. In order to analyze the spatial-temporal variation in the microzooplanktonic community, monthly surveys were held from March 2007 and February 2008 in the Botafogo river Estuary through surface hauls in three stations along the estuary using a plankton net of 64 μm mesh. In general there was little variation in the taxonomic composition between the dry and rainy season, but variations in abundance were more noticeable, especially between high tide and low tide samples. The number of organisms varied from 264.47 org.m-3 to 13,453.77 org.m-3 during the rainy season, and from 172.64 org.m-3 to 28,575.47 org.m-3 during the dry season. Holoplanktonic organisms dominated the community, and the copepods were predominant, especially nauplii, copepodids, and adults of O. hebes, A. lilljeborgii, P. crassirostris e E. acutifrons. Foraminifera, F. ehrenbergii, O. dioica, Gastropoda larvae and zoea larvae of Brachyura were also numerically important. The species diversity varied from very low to medium and the highest values occurred during high tide. The low salinity variation and also the small freshwater influence might explain the taxonomic variation in the estuary. Also, the high predominance of copepod nauplii, and species such as O. hebes and F. ehrenbergii contributes to the low species diversity indexes observed

ASSUNTO(S)

microzooplankton oithona hebes microzooplÃncton estuÃrio zoologia botafogo river oithona hebes, estuary

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