Zooplankton of the lakes' Littoral zone: structural, dynamic and functional parameters

Distribution, daily variability and influence of various species of macrophytes on the communities' structure of cladoceran zooplankton in lakes' littoral zone are considered. It is established, that the variability of structural parameters of zooplankton reduces as the depth increases, and large species of cladocer have the highest daily coefficients of number variation. Daily horizontal migrations of zooplankton are mainly caused by fish press. However the influence of predatory zooplankton and trophic factor on horizontal migrations is obscure. Expressiveness of horizontal migrations of zooplankton decreases together with the depth, and the effect of coast avoidance is basically observed at the large species of zooplankton and caused by both fish press and another factors. Essential distinctions are observed in the ratio of zooplankton functional groups in different types of littoral zones. The specific role of planktobenthos cladocer species with an active filtration device decreases in succession series of lakes. It is emphasized, that the weak scrutiny of the lakes' littoral zone gives different explanations of various interrelations in the zooplankton community and processes dynamics.