Dinâmica populacional de Appendicularia e Cladorera na plataforma interna de Ubatuba(SP): um estudo sazonal e multianual / Appendicularia and Cladocera population dynamics on the inner shelf off Ubatuba (SP): a seasonal and multiannual study

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

11/03/2010

RESUMO

This work aimed to evaluate the population dynamics of cladocerans and appendicularians at a fixed station off Ubatuba (state of São Paulo, Brazil). Zooplankton samples were monthly collected, from July 2005 through December 2008, with a 200 ?m mesh net. Appendicularians and cladocerans were identified, classified into stages, counted and measured. Both taxonomic groups had higher densities at upper layers, especially when the water column was stratified due to bottom intrusions of the South Atlantic Central Water (SACW). Temperature was the main parameter influencing on the distribution of Penilia avirostris and appendicularians, whereas salinity was the principal regulating parameter of Pseudevadne tergestina and Evadne spinifera population dynamics. Predation pressure and avaiable food also seemed to control the distribution of appendicularians and cladocerans. Gamogenic individuals occurred associated with abundance maxima; they were rare and had low abundances, which indicates that in Ubatuba cladocerans may propagate only through parthenogenesis during the entire year. Appendicularians had an annual mean production ~70% of that of copepods, which confirms that appendicularians play a key role in the carbon flow in coastal subtropical and tropical regions

ASSUNTO(S)

abundance abundância appendicularia appendicularia atlântico sul. biologia reprodutiva biomass biomassa cladocera cladocera penilia avirostris penilia avirostris produção secundária reproductive biology secondary production south atlantic

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