Benthos of oxbow lakes situated in the area of Zegrzyński Reservoir before its filling up with water

Kajak, Zdzisław

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Title: Benthos of oxbow lakes situated in the area of Zegrzyński Reservoir before its filling up with water

Abstract:

Analysis of the benthos from 5 oxbow lakes, made over the period from July to November, provided a basis for arranging these habitats in evolutionary order depending on their progressive isolation from the influences of the river, increase of oxygen deficit and degree to which they are overgrown by macrophytes. As evolutionary advance of the lake proceeded the qualitative richeness and abundance of benthos, as well as frequency of appearances and abundance of the juvenile instars of Chironomidae decreased, while the sharply defined domination and percentage of predatory forms increased (Procladius sp. and Heleidae).

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