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Boletim do Instituto Oceanográfico

Print version ISSN 0373-5524

Bol. Inst. Oceanogr. vol.39 no.2 São Paulo  1991

https://doi.org/10.1590/S0373-55241991000200001 

ARTIGOS

 

Phytoplankton and environmental factors in the Paraíba do Norte River Estuary, northeastern Brazil: composition, distribution and quantitative remarks

 

 

Roberto Sassi

Núcleo de Estudos e Pesquisas de Recursos do Mar, Universidade Federal da Paraíba (Campus Universitário, 58.059-900, João Pessoa, PB, Brasil)

 

 


ABSTRACT

This paper reports the results obtained from studies on the estuarine phytoplankton of the Paraíba do Norte River in northeastern Brazil. Surface and near-bottom samples were taken at four stations numbered seawards, during high and low tides from September 1978 to September 1979. A total of 139 phytoplankters were encountered. Diatoms and dinoflagellates showed highest diversity in most saline areas. Typical freshwater organisms were restricted to stations I and II where salinity was more reduced. Maximum cell densities were: 11,256,000 cells/1, 4,380,000 cells/1, 1,276,000 cells/1 and 1,035,000 cells/1, for stations I, II, III and IV, respectively. Sewage enrichments were probably responsible for the greatest values of the first two stations. However, in these stations the turbidity reduces light penetration, limiting phytoplankton growth particularly during the rainy season. The phytoflagellates (maximum of up to 4,874,000 cells/1) and the diatoms Thalassiosira spp (maximum of up to 9,262,000 cells/1) were dominant during the annual cycle. Other important taxa were Navicula spp, Cylindrotheca closterium, Paralia sulcata, Thalassionema nitzschioides and the dinoflagellate Protoperidinium spp. Seasonal variations of phytoplankton densities, dissolved oxygen, phosphate, water transparency, temperature, salinity and suspended material are also presented.

Descriptors:Phytoplankton, Estuaries, Environmental factors, Seasonal variations, Community composition, Check lists, Northeast Brazil.


Descritores: Fitoplâncton, Estuários, Fatores ambientais, Variações sazonais, Composição da comunidade, Lista de espécies, Estuário do Rio Paraíba do Norte: PB.


 

 

Full text available only in PDF format.

Texto completo disponível apenas em PDF.

 

 

Aknowledgements

I thank F. P. Brandini, from the Centro de Biologia Marinha, Universidade Federal do Paraná and M. B. B. Kutner, from the Instituto Oceanográfico, Universidade de Sâo Paulo, for the critical review of the manuscript. I also thank B. M. Grisi and K. V. Singarajah, from the Departamento de Sistemática e Ecologia, Universidade Federal da Paraíba, for reviewing the final English text. This study was funded by National Research Council (CNPq).

 

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(Manuscript received 28 May 1990; revised 17 April 1991; accepted 15 August 1991)

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