Estuarine and oceanic influences on copepod abundance and production of a subtropical coastal area

Autor(es)

Miyashita, Leonardo Kenji ^[1] ; de Melo Junior, Mauro ^[1] ; Lopes, Rubens M. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Biol Oceanog, Oceanog Inst, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Plankton Research; v. 31, n. 8, p. 815-826, AUG 2009.
• Citações Web of Science: 34

Resumo

We investigated the influence of nutrient-rich oceanic waters in comparison to the estuarine outflow from Santos Bay (SE Brazil) on copepod abundance and production on the adjacent inner shelf. Zooplankton samples were collected with a Multinet in spring 2005 and in summer 2006. Copepod biomass was derived from length-weight regressions, and growth rates were estimated from empirical models. Altogether, 58 copepod taxa were identified. The highest abundances were due to small-sized organisms including nauplii, oncaeids and copepodids of paracalanids and clausocalanids. Biomass and secondary production mirrored copepod abundance, with Temora copepodids accompanying the above-mentioned taxa as major contributors. The contribution of naupliar biomass and production was low (2.2 and 3.8% of the total, respectively). The influence of the Santos Bay outflow was observed only in spring, when Coastal Water (CW) dominated at the study site; whereas in summer the inner shelf was occupied by CW in the surface layer and the oceanic South Atlantic Central Water (SACW) in the bottom layer. The SACW intrusion had more of an influence for the increase in copepod production than the Santos Bay plume. The distribution and dynamics of the oceanic water masses seemed to be the most important influence on copepod diversity and production at this subtropical site. (AU)

• Processo FAPESP: 03/09932-1 - A influência do complexo estuarino da Baixada Santista sobre o ecossistema da plataforma adjacente (ECOSAN)
• Beneficiário: Ana Maria Setubal Pires-Vanin
• Modalidade de apoio: Auxílio à Pesquisa - Programa PRONEX - Temático
• Processo FAPESP: 06/60180-9 - Composição, biomassa e produção dos copépodes pelágicos na plataforma adjacente a Santos
• Beneficiário: Leonardo Kenji Miyashita
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica