2010
DOI: 10.4322/actalb.2011.004
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Primary productivity of the phytoplankton in a tropical Brazilian shallow lake: experiments in the lake and in mesocosms

Abstract: Aim: To evaluate the primary productivity of the phytoplankton in the Lake Monte Alegre, southeastern Brazil, and the factors that influence its fluctuations, experiments were carried out in the lake and in mesocosm; Methods: Primary productivity rates were measured using the 14 C technique, in experiments carried out monthly in the lake, during one year, and in two mesocosm experiments, one in the winter and another in the summer. Other factors also analyzed were temperature, dissolved oxygen, pH, electrical … Show more

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Cited by 17 publications
(19 citation statements)
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References 28 publications
(31 reference statements)
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“…Finlay et al (2007), studying several temperate lakes, concluded that zooplankton were controlled mainly by primary productivity (bottom-up) and not by predators (top-down). However, the seasonal increase in food availability in Lake Monte Alegre, with higher primary productivity of the phytoplankton (1998-99;Feresin et al, 2010Feresin et al, ) or biomass (2011Ferreira, 2013) in the warm season, did not result in corresponding increases of herbivorous microcrustaceans, particularly cladocerans (Fig. 6a).…”
Section: Discussionmentioning
confidence: 99%
“…Finlay et al (2007), studying several temperate lakes, concluded that zooplankton were controlled mainly by primary productivity (bottom-up) and not by predators (top-down). However, the seasonal increase in food availability in Lake Monte Alegre, with higher primary productivity of the phytoplankton (1998-99;Feresin et al, 2010Feresin et al, ) or biomass (2011Ferreira, 2013) in the warm season, did not result in corresponding increases of herbivorous microcrustaceans, particularly cladocerans (Fig. 6a).…”
Section: Discussionmentioning
confidence: 99%
“…Entretanto, a influência da temperatura não pode ser separada de um fator biótico como o alimento, cujo efeito é evidente na estação fria. Nesse período ocorre a menor produtividade primária do fitoplâncton, influenciada principalmente por fatores físicos e químicos (Feresin, 2010), mas pouco influenciada pelos fatores bióticos, como controle do zooplâncton sobre o fitoplâncton (Silva, 2004). Além disso, algumas algas existentes no lago são consideradas relativamente mais indigestas (Fileto et al, 2004).…”
Section:  Variação Temporal No Lago Monte Alegreunclassified
“…As concentrações de OD chegaram a valores muito baixos (<1 mg.L -1 ), mas ausência total no hipolímnio não foi registrada, embora evidências de anoxia tenham sido Discussão| 60 reportadas por Arcifa et al (1990;1998 (Arcifa et al, 1998;Feresin et al, 2010).…”
Section: Discussão| 58unclassified
“…Based on the experimental data, an approximate estimate of algae consumption by Tilapia rendalli in the treatment with fish indicated a loss of about 20% of the total algae at the end of the experiment. However, the direct grazing on phytoplankton and a 20% loss, theoretically imposed by tilapia, was not effective in controlling its biomass as has also been shown for the primary productivity (Feresin et al, 2010).…”
Section: Zooplanktonmentioning
confidence: 99%