Abstract
The assessment of factors that determine the spatial distribution of zooplankton abundance is a central issue in zooplankton ecology. Since these factors are, in the most cases, spatially autocorrelated, especially in reservoirs, it is frequently difficult to isolate the primary causes that explain the variation in zooplankton abundance. In this paper, the spatial variation of copepods in Corumbá (Goiás,Brazil) was studied. Sets of variables were used to model copepod abundance variation: limnology (abiotic variables), phytoplankton and spatial position of sampling sites.The copepod assemblage was composed of Thermocyclops minutus, Thermocyclops decipiens, Mesocyclops longisetus and Notodiaptomus iheringi. Along the reservoir’s main axis, abundance increases, albeit not linearly, towards the lacustrine zone. High abundance, similar to that found in the lacustrine region, was also observed in the lateral arms. These patterns were very similar for different years and seasons. Copepods were significantly correlated with phytoplankton and geography. After controlling for the effect of space, the relationship between copepods and phytoplankton was not significant (partial Mantel test). This result indicates that hydrology is the primary process that controls not only the abundance of copepods, but also limnological features and food resources, which are commonly used to explain variations in zooplankton abundance.
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Velho, L.F.M., Lansac-Tôha, F.A., Bonecker, C.C., Bini, L.M., Rossa, D.C. (2001). The longitudinal distribution of copepods in Corumbá Reservoir, State of Goiás, Brazil. In: Lopes, R.M., Reid, J.W., Rocha, C.E.F. (eds) Copepoda: Developments in Ecology, Biology and Systematics. Developments in Hydrobiology, vol 156. Springer, Dordrecht. https://doi.org/10.1007/0-306-47537-5_32
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DOI: https://doi.org/10.1007/0-306-47537-5_32
Publisher Name: Springer, Dordrecht
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