Ecological characteristics of small river fish fauna: structure of fish commmunities.
1994
Simonovic P. | Soldatovic B. | Simovic S. | Markovic G.
The study of fish communities on certain sampling spots from two distanced sampling sites on the Vapa river (Serbia, Yugoslavia), revealed the discrepancy between results of quantitative and qualitative analyses, thus suggesting the fine structuration within fish communities. It is due to specific affinities of particular species: Leuciscus cephalus to a deeper water, Barbus peloponnesius to a shallow water, Orthrias barbatulus to a faster current, and Chondrostoma nasus to weedless parts. Some other fish species revealed the regular distribution, e.g. Cottus gobia, Gobio gobio, Alburnoides bipunctatus, thus suggesting the possibility of distinguishing the particular river regions. Habitats with a domination of the single species had small diversity, while those with the even distribution of species had the greatest diversity. The different composition of communities in weeded marginal zones from the composition of nearby different habitats suggests they are unstable, and fluctuating. That, and small size-classes of fishes, suggest that these weeded habitats most likely serve as a refugee for fish.
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