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JPR Advance Access published online on June 9, 2009
Journal of Plankton Research, doi:10.1093/plankt/fbp039
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org

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

Leonardo Kenji Miyashita, Mauro de Melo Júnior and Rubens M. Lopes*

Department of Biological Oceanography, Oceanographic Institute, University of São Paulo, São Paulo, Brazil

* CORRESPONDING AUTHOR: rubens{at}usp.br

Received on March 25, 2009; accepted on May 11, 2009


  Abstract

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.

Corresponding editor: Roger Harris


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