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Numerical contribution of phytoplanktonic cells, heterotrophic particles and bacteria to size fractionated POC in the Cananéia estuary (25ºS 48ºW), Brazil

Abstract

Oxidable POC, at two stations in the Cananéia estuary, was found to be largely dependent upon the smallest size POC. The correlation factors between POC and the numerical abundance of cells, heterotrofic particles and bacteria, in each of the size categories studied, were generally low and non-significant for both stations, with a few exceptions. At St. I the number of heterotrophic particles seems to account for some of the POC variation over the year. At St. II, the only significant correlation found was between the number of the largest and intermediate size classes bacteria and the equivalent size classes POC. At this station the importance of the detritus component is suggested. The differences found between the stations, concerning the numerical contribution of cells, particles and bacteria to total POC, have been attributed to the differential hydrodynamic conditions acting upon material coming from land, due to diverse location of the stations. Sampling date and the collection of different water masses have also been considered as factors that may greatly affect the relationships studied.

Size distribution; Particulate organic carbon; Phytoplankton; Particle counters; Bacteria; Estuaries; Cananêia; Brazil


ARTIGOS

Numerical contribution of phytoplanktonic cells, heterotrophic particles and bacteria to size fractionated POC in the Cananéia estuary (25ºS 48ºW), Brazil

Hilda de Souza Lima Mesquita; Clóvis de Araujo Peres

Instituto Oceanográfico da Universidade de São Paulo. Instituto de Matemática e Estatística da Universidade de São Paulo

SYNOPSIS

Oxidable POC, at two stations in the Cananéia estuary, was found to be largely dependent upon the smallest size POC. The correlation factors between POC and the numerical abundance of cells, heterotrofic particles and bacteria, in each of the size categories studied, were generally low and non-significant for both stations, with a few exceptions. At St. I the number of heterotrophic particles seems to account for some of the POC variation over the year. At St. II, the only significant correlation found was between the number of the largest and intermediate size classes bacteria and the equivalent size classes POC. At this station the importance of the detritus component is suggested. The differences found between the stations, concerning the numerical contribution of cells, particles and bacteria to total POC, have been attributed to the differential hydrodynamic conditions acting upon material coming from land, due to diverse location of the stations. Sampling date and the collection of different water masses have also been considered as factors that may greatly affect the relationships studied.

Descriptors: Size distribution, Particulate organic carbon, Phytoplankton, Particle counters, Bacteria, Estuaries, Cananêia: SP, Brazil.

Descritores: Fracionamento, Carbono orgânico particulado, Fitoplâncton, Número de partículas, Bacteria, Estuários, Cananêia: SP.

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

Acknowledgements

The author greatly acknowledge the helpfull comments of Dr. Jean-Claude Romano, from Station Marine d'Endoume, Marseille.

This work was supported jointly by the "Fundação de Amparo à Pesquisa do Estado de São Paulo" and "instituto Oceanogrãfico da Universidade de São Paulo".

(Received 01-Oct-1984; accepted 11-Apr- 1985)

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Publication Dates

  • Publication in this collection
    01 June 2012
  • Date of issue
    1985

History

  • Accepted
    11 Apr 1985
  • Received
    01 Oct 1984
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