The importance of zooplankton in the food chain of aquatic ecosystems has been well documented (Agasild and Noges, 2005; Medeiros and Arthington, 2008). Zooplankton has a special role as a food for fish larvae and aquatic invertebrates. Furthermore, the species composition and the abundance of zooplankton such as rotifers and cladocerans are excellent tools for interpreting the trophic level in a given water body, since they are very sensitive to environmental variables such as nutrient availability (
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