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JPR Advance Access originally published online on June 9, 2004
Journal of Plankton Research 2004 26(9):983-992; doi:10.1093/plankt/fbh090
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Journal of Plankton Research Vol. 26 No. 9 © Oxford University Press 2004; all rights reserved

Mesozooplankton grazing under conditions of extreme eutrophication in Guanabara Bay, Brazil

R. Schwamborn1,*, S. L. C. Bonecker2, I. B. Galvão3, T. A. Silva1 and S. Neumann-Leitão1

1 Departamento Oceanografia, Universidade Federal de Pernambuco, 50730-540 Recife, Brazil, 2 Departamento Zoologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil and 3 Institut für Meereskunde, Düsternbrooker WEG 20, 24105 Kiel, Germany

* Corresponding Author: rs{at}ufpe.br

Received July 23, 2003; accepted in principle February 11, 2004; accepted for publication February 21, 2004; published online June 9, 2004

The objective of the present study was to quantify mesozooplankton grazing in the eutrophic waters of Guanabara Bay. Mesozooplankton (>200 µm) was dominated by the copepods Acartia lilljeborgi, Acartia tonsa, Parvocalanus crassirostris and Paracalanus furcatus. Dinoflagellates, specifically the species Prorocentrum triestinum, were an important group for mesozooplankton nutrition, being ingested in significant amounts during all experiments. On average, 12.3 ± 2.9 P. triestinum cells were ingested copepod–1 min–1 (other dinoflagellates: 11 ± 8 cells copepod–1 min–1). Filamentous cyanophyceae and nanoplankton were ingested in one experiment each, but the mesozooplankton community generally preferred dinoflagellates to these groups, which were always abundant in the water column. Euglenophyceae were not ingested, although they dominated in one experiment. Mesozooplankton ingested, on average, only 0.2% of the nano- and microplankton biomass per day. The results suggest that grazing was not a controlling process for the nano- and microplankton community in the study area. Addition of zoeae larvae of Chasmagnatus granulata (Decapoda: Brachyura: Grapsidae) in one experiment had a significant effect on the mortality of adult copepods, probably due to a predator–prey relationship.


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