MACROINVERTEBRATE DRIFT IN A LOWLAND RIVER DURING ITS RECOVERY TO THE NATURAL DISCHARGE * **

Maria Grzybkowska, Eliza Szczerkowska, Mariusz Tszydel, Małgorzata Dukowska, Leszek Kucharski, Patrycja Rosiak
2006 Acta Agrophysica   unpublished
The aim of the study was to learn the composition and seasonal dynamics of the macro-invertebrate drift of the Drzewiczka River in a period of the river's recovering to its natural discharge (renaturisation), after almost seven decades of impoundment and two decades of canoeing track functioning there. In five dominant river habitats, morphometric and hydraulic river parameters were recorded beside the abundance of drifting macroinvertebrates to assess which of them determine the amount of the
more » ... the amount of the macroinvertebrate drift. Macroinvertebrates constituted from 0.5 to 2.3% of the total weight of the transported organic matter. Their relatively high density in the water column (the maximum was 4947 specimens per 100 m-3 in H M in May) may be explained by colmatation. In the macroinvertebrate drift, dipter-ans of the Chironomidae family (mainly Orthocladiinae and Tanytarsini), mayflies (mainly Baetis), and black-flies (Simulidae) were dominant. K e y w o r d s: macroinvertebrate drift, Chironomidae, Trichoptera, river, renaturisation
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