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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bgd-7-6243-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/bgd-7-6243-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 19 Aug 2010

Research article | 19 Aug 2010

Review status
This discussion paper is a preprint. It has been under review for the journal Biogeosciences (BG). The revised manuscript was not accepted.

Assessing the ecological status of plankton in Anjos Bay: a flow cytometry approach

G. C. Pereira1, A. R. de Figuiredo1, P. M. Jabor2, and N. F. F. Ebecken1 G. C. Pereira et al.
  • 1Federal University of Rio de Janeiro – COPPE/UFRJ, Centro de Tecnologia, Cidade Universitária, Ilha do Fundão, Bloco B, Cx. Postal 68506 Rio de Janeiro, RJ, Brazil
  • 2Admiral Paulo Moreira Institute of Sea Studies – EAPM, Departamento de Oceanografia, rua Kioto 253, Cep.28430-000 Arraial do Cabo, RJ, Brazil

Abstract. This aim of this paper is to assess the use of the heterotrophic/autotrophic ratio as an early indicator of trophic status as a part of development of a real time monitoring program at Anjos Bay, Rio de Janeiro, Brazil. An in-situ flow cytometer was used to quantify the abundances of phytoplankton and cyanobacteria, which were identified by chlorophyll and phycoerythrin autofluorescence, respectively. Heterotrophic prokaryotes and viruses were quantified by DNA-binding fluorochromes; merozooplankton larvae were collected by plankton net and quantified by stereomicroscopy. The temporal and spatial distributions of these variables were evaluated on the basis of weekly observations from August 2006 to September 2007. The heterotrophic/autotrophic ratio and the viral abundance were correlated with upwelling events and assume an apparently seasonal pattern. A possible control mechanism and influential factors are discussed, and it is concluded that this ecosystem is bottom-up controlled under eutrophic conditions and top-down controlled under oligotrophic conditions.

G. C. Pereira et al.
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Interactive discussion
Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
Printer-friendly Version - Printer-friendly version Supplement - Supplement
G. C. Pereira et al.
G. C. Pereira et al.
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