Water residence time in the Włocławek dam reservoir (the Vistula river, Poland) affects its macrozoobenthos structure

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Table 1

Measured abiotic parameters (average values) in the rheolimnic and limnetic zones of the Włocławek Dam Reservoir.

Parameters	Rheolimnic zone	Limnetic zone
Depth (m)	4.6	10.7
Secchi depth ^*	0.8	1.0
Bottom sediments
Water content (%) ^*	60.0	78.7
Organic matter content (%)^*	5.8	11.4

statistically significant difference

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