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Journal of Plankton Research Vol.23 no.6 pp.641-650, 2001
© Oxford University Press 2001

The Influence of Ekman Transport on Zooplankton Biomass Variability off Southern Brazil

C. Resgalla, Jr1, C. De La Rocha2 and M. Montú2 1 Universidade Do Vale Do Itajaí – Cttmar/univali – R. Uruguai 458, Caixa Postal 360. Itajaí, SC. Cep 88.302–202, Brazil, 2 Fundação Universidade De Rio Grande – DeptO. De Oceanografia (furg/doc), Caixa Postal 474, Rio Grande, RS. Cep 96.201, Brazil

Cross- and long-shelf Ekman transport components were correlated with the variability of zooplankton biomass from 1977 to 1990 off the southern Brazilian coast (27°S to 35°S and 46°W to 54°W). During warm months the dominant cross-shelf Ekman transport was oriented offshore, where an increase in zooplankton biomass occurred with intervals of 2–3 months. The presence of the South Atlantic Central Water (SACW; the water mass that typically upwells at the continental shelf) was confirmed by seasonal temperature–salinity diagrams. The high zooplankton biomass values observed in this study were frequently caused by salps, which play an important ecological role in the pelagic community in upwelling zones that has not been investigated yet.


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