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Table 6

Significance of the effects of environmental variables on zooplankton abundance based on multiple regression (stepwise procedure) with the following dependent variables: Ntot, Nr, Ncl, Ncp − total zooplankton, Rotifera, Cladocera, and Copepoda density, respectively; Btot, Br, Bcl, Bcp − total zooplankton, Rotifera, Cladocera, and Copepoda biomass, respectively. The independent variables included in the model were: Q − water flow; DO − dissolved oxygen; H2S − hydrogen sulphide; SO4 – sulphate; PO4-P − soluble reactive phosphorus. Probability levels of t-values for coefficients are denoted as follows: *P  < 0.05, **P < 0.01; 1,2 site number.

  Coefficients Regression statistics

Variable Q P- PO4 SO4 H2S DO F P R2
Ntot 1.94**       0.47* 27.72 0.021 0.720
Nr 2.01**       0.40* 26.89 0.027 0.69
Ncp   −2.94**   −0.50*   211.50 0.004 0.74
Btot   −0.59*       15.37 0.04 0.35
Bcp   −4.05** −1.97*     26.70 0.023 0.667

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