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Penczak, T. and R. H. K. Mann (1993). A preliminary evaluation of the effect of human activity on the fish populations of the Pilica River, central Poland. Pages 101-115 in R. J. Wootton, ed. International Symposium on the Ecology of Fluvial Fishes: Environmental Variation of Riverine Fishes: Management Implications, Lodz (Poland), Polish Archives of Hydrobiology.
The impact of human activity in the Pilica River drainage basin (9245 km2) was assessed by an electrofishing survey of 140 sites of the main river and tributaries. The sites, which included all stream orders from I-VI, were divided into three categories: natural, modified and moderately polluted. In lower order streams, river channel modifications had a negative influence on fish species diversity and the population density and the standing crop of lithophilous species. In modified, higher order streams these indices of fish population dynamics increased probably because of an increase in fish refuges along the banks, where the latter were reinforced with large stones and tree branches.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://www.umesc.usgs.gov/URL: http://www.umesc.usgs.gov/data_library/fisheries/fish_passage/penczak2.html
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