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Journal of Plankton Research Vol.23 no.10 pp.1121-1136, 2001
© Oxford University Press 2001

Plankton composition and cycling of carbon during the rainy season in a tropical coastal ecosystem, Zanzibar, Tanzania

Charles Lugomela, Petra Wallberg,1,3 and Torkel Gissel Nielsen,2

Institute Of Marine Sciences, University Of Dar Es Salaam, Po Box 668, Zanzibar, Tanzania, 1 Institute Of Applied Environmental Research, Stockholm University, Se-106 91 Stockholm, Sweden and 2 Department Of Marine Ecology, National Environmental Research Institute, Frederiksborgvej 399, Dk-4000 Roskilde, Denmark

3 To Whom Correspondence Should Be Addressed At: Swedish Radiation Protection Agency, Se-171 16 Stockholm, Sweden

Biomass, species composition and production of the planktonic community were investigated during the rainy season in May and June 1999 outside Zanzibar Island, Tanzania. In general, the plankton biomass of different organisms was uniform between depths as well as over time. The integrated water column primary production ranged from 204 to 4142 mg C m–2 day–1. Bacterial production varied between 10 and 72 mg C m–2 day–1, comprising ~5% of the total bacterial standing stock. The data obtained from these experiments are summarized in a carbon budget. At the most 77% of the total primary production channelled through the heterotrophic flagellates, ciliates and heterotrophic dinoflagellates to higher trophic levels. Of the estimated carbon demand for mesozooplankton, 28% could potentially be met by ciliates and heterotrophic dinoflagellates.


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