Aspects of the time-space variation of the phytoplankton biomass and production and related parameters in Santos Estuary and Bay / Aspectos da variação espacial e temporal da biomassa e produção fitoplanctônica e parâmetros correlatos no estuário e baía de Santos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2007

RESUMO

The relationship between time-space variations of phytoplankton biomass and primary productivity and the variability in physical and chemical characteristics of the water column was investigated by monthly samplings of temperature, salinity, inorganic nutrients, seston and phytoplankton biomass in 4 oceanographic stations in Santos Bay and 3 stations in Santos Channel, during the period from November 2004 to December 2005. The transport of properties between estuarine channels and the bay was estimated by measurements conducted in fixed stations located at Santos and São Vicente Channels inlets throughout a complete tidal cycle (13h). The main limiting factors to phytoplankton biomass development were: light availability, water column stratification and temperature. Santos and São Vicente channels imported salt, nutrients and phytoplankton biomass in the majority of the studied cases. High levels of dissolved inorganic nutrients and biomass indicate no nutritional limitation, despite the dystrophic conditions observed. High chlorophyll-a concentrations (mean value 9.82 mg m-3) indicate the environment still displays the eutrophic characteristics already reported in former studies conducted in this area by more than 30 years ago.

ASSUNTO(S)

biomass fitoplâncton eutrofication santos transporte resultante nutrientes inorgânicos séston produção primária pigmentos fotossintéticos primary production inorganic nutrients seston eutrofização biomassa phytoplankton photosynthetic pigmente resultant transport santos

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