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Título: The fate of planktonic primary production
Autor(es): Bruce Rider Forsberg
Assunto: Alga
ISSN: 0024-3590
Revista: Limnology and Oceanography
Volume: 30
Resumo: The carbon dynamics of phytoplankton communities in six different lakes were investigated. In each lake carbon-specific rates of production (b) and loss (d) were highly correlated and closely balanced through most of the year. As a result carbon-specific growth rates were usually very low and carbon standing crop was relatively stable between sampling dates. Major fluctuations in algal biomass occurred only when the production-loss balance was significantly perturbed. The frequency of these perturbations and the seasonal variability of b and d differed between lakes. The most consistent pattern was found in the low altitude lakes of the temperate zone, where b and d were highest in summer and lowest in winter. Values were also low during the spring and fall mixing periods when perturbations in the production-loss balance caused major peaks in carbon standing crop. The fate of primary production varied significantly between lakes. In most of the lakes considered the majority of carbon fixation was consumed in metabolic processes. However, in Lake Wingra a large part of the production was apparently lost through grazing and sedimentation. Differences in the average values of b, d, and % metabolic loss between lakes appeared to depend on the combined loss rate due to sinking and grazing. These results suggest a general pattern of carbon dynamics similar to that found insteady state continuous cultures.
ISSN: 0024-3590
Aparece nas coleções:Coordenação de Dinâmica Ambiental (CDAM)

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