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Table 2
Number of taxa and diversity (both average per one sample), as well as average density (ind. m−2) of the macrozoobenthos in the rheolimnic and limnetic zone of the Włocławek Dam Reservoir.
| Macrozoobenthos | Rheolimnic zone | Limnetic zone |
|---|---|---|
| OLIGOCHAETA | ||
| Number of taxa − total | 9 | 8 |
| Number of taxa − per one sample* | 7 | 6 |
| Shannon index − per one sample* | 1.95 | 1.72 |
| Limnodrilus hoffmeisteri | 22964 | 33624 |
| Limnodrilus claparedeanus | 12915 | 21525 |
| Potamothrix hammoniensis * | 2165 | 7732 |
| Potamothrix bavaricus | 4066 | 3008 |
| Tubifex tubifex * | 6283 | 1034 |
| Limnodrilus profundicola | 1576 | 2897 |
| Potamothrix moldaviensis * | 1154 | 0 |
| Limnodrilus udekemianus * | 528 | 14 |
| Dero sp. | 0 | 116 |
| Psammoryctides sp. | 96 | 0 |
| OLIGOCHAETA − total | 51747 | 69949 |
| CHIRONOMIDAE | ||
| Number of taxa − total | 4 | 5 |
| Number of taxa − per one sample* | 3 | 2 |
| Shannon index − per one sample* | 0.62 | 0.29 |
| Chironomus sp. | 13661 | 19886 |
| Glyptotendipes sp. * | 1558 | 20 |
| Procladius sp. | 436 | 248 |
| Cryptochironomus sp. * | 358 | 2 |
| Polypedylum nubeculosum | 0 | 6 |
| Chironomidae pupae | 0 | 33 |
| CHIRONOMIDAE − total | 16013 | 20195 |
| MOLLUSCA | ||
| Number of taxa − total | 8 | 2 |
| Number of taxa − per one sample* | 4 | 1 |
| Shannon index − per one sample* | 0.81 | 0.17 |
| Sphaerium sp. | 3698 | 763 |
| Pisidium sp. | 1296 | 14 |
| Valvata * | 55 | 0 |
| Bithynia tentaculata * | 28 | 0 |
| Viviparus viviparus * | 30 | 0 |
| Dreissena polymorpha * | 19 | 0 |
| Unio sp. * | 17 | 0 |
| Radix auricularia | 8 | 0 |
| MOLLUSCA − total | 5124 | 776 |
| HIRUDINEA* | 602 | 0 |
| NEMATODA* | 0 | 69 |
| ZOOBENTHOS − total | ||
| Number of taxa − total | 22 | 16 |
| Number of taxa − per one sample* | 16 | 10 |
| Shannon index − per one sample* | 2.49 | 1.92 |
| ZOOBENTHOS | 73486 | 90990 |
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