Abstract
Abundance and body size of zooplanktonic organisms, testate amoebae, rotifers, cladocerans and copepods from the littoral and pelagic regions of three lakes were analyzed in February and August 2000. The lakes belong to three different river systems (Baía, Ivinhema and Paraná rivers) of the upper River Paraná floodplain. It was expected that average body size was different in space (regions of the lake and limnological characteristics) and time (summer and winter) because the variation of depth, pH, oxygen dissolved, chlorophyll-a and water temperature of each lake. Zooplankton community was represented by 119 species. Sorensen's coefficient showed that the three communities were similar. Larger organisms were found in the lakes' pelagic region, and seasonally larger individuals were registered in the winter and smaller individuals in the summer. The relationship between body size and density was slight, positively significant. The body size frequency distribution was bi-modal. ANOVA results showed a significant influence of the interaction of the littoral and pelagic regions, lakes, and seasons in the body size of zooplankton organisms. Spatial and temporal changes of the community size structure of zooplanktonic assemblages were related to the food resource (microbial-loop or herbivore chain), species habitat preference and life strategies (growth and reproduction).
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de Azevedo, F., Costa Bonecker, C. Community size structure of zooplanktonic assemblages in three lakes on the upper River Paraná floodplain, PR-MS, Brazil. Hydrobiologia 505, 147–158 (2003). https://doi.org/10.1023/B:HYDR.0000007303.78761.66
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DOI: https://doi.org/10.1023/B:HYDR.0000007303.78761.66