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A influência das variações nictemeral e sazonal sobre as curvas de luz-fotossíntese

The influence of nictemeral and seasonal variations on light-photosynthesis phases

Resumo

A series of experiments with natural phytoplccnkton populations was made to study the photosynthetic Pmax and a indices, under different phases of the diel cycles. By "in situ" and simulated experiments the exogenous and endogenous influences on the photosynthesis and total chlorophyll-a were studied. The results obtained indicate the diel variation can introduce a great deal of error in the determination of the primary production. The use of constant values for a and Pmax in the equation for the determination of primary production without carrying for the aspect above as well as for the seasonal variation may give results for the diurnal values, with a very lend accuracy and without ecological significance. It was also observed that the measurements of chlorophyll-a varied within the relatively short period of time, required to perform a determination of photosynthesis. It is suggested that the Pmax, a and Ik values used in primary productivity methodology should be revised, as the indices considered are based in chlorophyll concentration.


ARTIGOS

A influência das variações nictemeral e sazonal sobre as curvas de luz-fotossíntese

The influence of nictemeral and seasonal variations on light-photosynthesis phases

Clóvis Teixeira

Instituto Oceanográfico da Universidade de São Paulo

SYNOPSIS

A series of experiments with natural phytoplccnkton populations was made to study the photosynthetic Pmax and a indices, under different phases of the diel cycles. By "in situ" and simulated experiments the exogenous and endogenous influences on the photosynthesis and total chlorophyll-a were studied. The results obtained indicate the diel variation can introduce a great deal of error in the determination of the primary production. The use of constant values for a and Pmax in the equation for the determination of primary production without carrying for the aspect above as well as for the seasonal variation may give results for the diurnal values, with a very lend accuracy and without ecological significance. It was also observed that the measurements of chlorophyll-a varied within the relatively short period of time, required to perform a determination of photosynthesis. It is suggested that the Pmax, a and Ik values used in primary productivity methodology should be revised, as the indices considered are based in chlorophyll concentration.

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Agradecimentos

À FINEP (Financiadora de Estudos e Projetos) e à O.E.A., pelo apoio financeiro à pesquisa. Ao CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico), pela Bolsa de Pesquisador.

(Manuscrito recebido em 29/set./1981; aceito em 6/abr./1982)

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Datas de Publicação

  • Publicação nesta coleção
    04 Jun 2012
  • Data do Fascículo
    1982

Histórico

  • Aceito
    06 Abr 1982
  • Recebido
    29 Set 1981
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