%0 Journal Article
%T Habitat variability and fish species structure in the Ko¨˝czak stream
%A Janusz Golski
%A Antoni Przyby
%A Jan Mazurkiewicz
%A Wojciech Andrzejewski
%A Jakub Trawi¨˝ski
%J Oceanological and Hydrobiological Studies
%@ 1897-3191
%D 2010
%I 
%R 10.2478/v10009-010-0052-2
%X In the year 2008, studies on ichthyofauna were carried out in the Ko¨˝czak stream. The stream was divided into four sections representing the variability of the water course. In each section, a research segment (100-150 meters long) was defined. In the ichthyofauna structure analysis, the indices of quantitative biocenotic domination and biomass were used. Furthermore, on the basis of the obtained data, the Shannon-Wiener indices of species diversity (H), as well as the abundance and the biomass (ABC index) were calculated. Altogether, in all research localities, 667 fish specimens were collected, with a total weight of 8,760 g and classified into 19 species. The caught fish were classified into 8 reproductive groups. Significant differences in the species composition and the number of fish were recorded between the particular sections. The number of species occurring in the studied sections oscillated between 2 and 17. The richest ichthyocenoses were recorded in the transitional and forest sections characterized by a comparatively small transformation of the habitats and good environmental conditions. In the remaining two sections, located in the middle and in the upper stream course, there was a distinct impoverishment of ichthyocenoses caused by the decreased attractiveness of the habitats.
%K Ko¨˝czak stream
%K habitat
%K ichthyofauna
%K species structure
%U http://versita.metapress.com/content/023463mn8646v146/?p=251e39c84a7443ec8f12ca7ff76e23c3&pi=7