Primary prodution of Santos Bay, Sao Paulo state: aspects of photosynthetic efficiency in a polluted environment / PRODUCAO PRIMARIA DA BAIA DE SANTOS, ESTADO DE SAO PAULO - ASPECTOS SOBRE A EFICIENCIA FOTOSSINTETICA NUM AMBIENTE MARINHO POLUIDO

AUTOR(ES)

Sonia Maria Flores Gianesella

DATA DE PUBLICAÇÃO

1978

RESUMO

The phytoplankton photosynthetic efficiency of Santos Bay was studied by means of water samples colected bimensaly, from February to December, 1976. Three points were sampled, the most characteristic of the different environments in the region: one station at the estuary mouth, one next to the beach and the last one at the bay entrance. The region is interesting due to the presence of different kinds of polutants, which could afectt the phytoplankton. The analyses of the physical and chemical parameters (trans-parency, temperature, salinity, pH, suspended material,dissol-ved Oxigen, nutrients and Mercury) were carried on by CETESB. The phytoplankton standing-stock determination was made by cells counts and by clorophyll-a concentration measurements. The primary production was determined by 14C method. The samples were incubated at several light intensities up to a maximum of 60 Klux to determine the photosynthesis efficiency at the saturation light. The radioactivity of the samples was measured by "G-M"counter and by liquid scintillation. The comparisons of the results between both theequipments suggest that the previous data from "G-M" counter must be corrected and that we dont should use this apparatus anymore. The results of the assimilation number, as well as the phytoplankton biomass were high even when comparing then to other eutrofic regions, because of the high leveI of nutrient of the region. The values of primary production and assimilation number probably are subestimated because of several factors that are discussed in the presente paper. Deformed cells of Skeletonema and Leptocylindrus were ob-served. The possible causes of these anomalies are also dis-cussed.

ASSUNTO(S)

entrophicotion estuary produção primária santos bay photosynthetic efficiency estuary. baía de santos primary prodution eutrofização poluição eficiência fotossintética pollution

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