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Table 1

Zooplankton species composition and mean density [indiv. L−1] at sites number 1 and 2 in the Kortówka River − only dominants and species of a high constancy of occurrence are shown.

Zooplankton taxa Site Mean density (SD) D * C **
Anuaeropsis fissa (Gosse, 1851) 1 32.1 (36.9) +++ xx
2 29.8 (52.5) +++ xx
Ascomorpha ecaudis (Perty, 1850) 1 3.2 (4.1)   x
2 3.6 (2.9) + xx
Ascomorpha ovalis (Bergendal, 1892) 1 2.7 (2.6) + xx
2 1.9 (1.7)   x
Asplanchna priodonta (Gosse, 1850) 1 6.7 (5.6) + xx
2 5.5 (6.1) + xx
Keratella cochlearis (Gosse, 1851) 1 41.8 (78.6) +++ x
2 25.1 (14.5) +++ x
Keratella cochlearis var tecta (Gosse, 1851) 1 33.1 (21.2) +++ xx
2 25.2 (14.5) +++ xx
Polyarthra dolichoptera (Idelson, 1925) 1 18.4 (13.1) +++ xx
2 13.3 (10.0) ++ xx
Polyarthra major (Burckhardt, 1900) 1 10.3 (9.4) ++ xx
2 8.3 (6.7) ++ xx
Proales sp. 1 1.7 (0.8)    
2 6.4 (6.4) + xx
Trichocerca pusilla (Lauterborn, 1898) 1 3.1 (3.3)  ·  x
2 4.0 (3.4) + x
nauplius 1 13.4 (8.1) ++ xx
2 11.0 (9.1) ++ xx
copepodite (Cyclopoida) 1 2.8 (1.3)  ·  x
2 2.8 (3.8)  ·  x

* the level of species dominance (D) is indicated as follows: +++ eudominant; ++ dominant;+ subdominant, ·recedent; **species occurrence constancy (C) is indicated as follows: absolute species xx-mark; constant species x-mark.

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