期刊
BRAZILIAN JOURNAL OF BIOLOGY
卷 69, 期 1, 页码 75-85出版社
INT INST ECOLOGY
DOI: 10.1590/S1519-69842009000100009
关键词
diel and vertical distribution; shallow tropical lake; thermal stratification; phytoplankton functional groups; grazing
类别
资金
- FAPESP (Fundaqao de Amparo A Pesquisa do Estado de Sao Paulo)
Phytoplankton vertical and diel dynamics in a small shallow lake (Lake Monte Alegre, Ribeirao Preto, state of Sao Paulo) were investigated in two climatological periods: July 2001 (cool-dry season) and March 2002 (warm-rainy season). Monte Alegre is a eutrophic reservoir, with a warm polymictic discontinuous circulation pattern. The lake was thermally stratified in both periods, although dissolved oxygen varied less in the cool-dry period. Phytoplankton biomass was higher in the warm-rainy season and the vertical distribution was stratified in both seasons. Flagellate groups (L-m, Y, W-1 and W-2) and functional groups typical of shallow eutrophic environments (J, X-1 and S-n) were important throughout the study period. The lake's thermal pattern strongly influenced the vertical distribution of the phytoplankton community in both periods. Biomass, functional groups and size classes of phytoplankton also were determined by the presence of more efficient herbivores in the lake, especially during the cool-dry period when phytoplankton biomass decreased.
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