title: Abundance of Cottus poecilopus is influenced by O2saturation, food density and Salmo trutta in three tributaries of the Rožnovská Bečva River, Czech Republic.
abstract: The distribution patterns of alpine bullhead Cottus poecilopus in three tributary streams of the Rožnovská Bečva River (Danube basin) were studied with respect to temperature, oxygen concentration and saturation, shading, current, conductivity, total organic carbon (TOC), nitrates and phosphates, biochemical oxygen demand (BOD5), pH, redox potential, bottom grain structure, density of macroinvertebrates and the abundance of brown trout Salmo trutta. Sites with lower abundance per hectare of C. poecilopus differed significantly in dissolved oxygen saturation, density of macroinvertebrates during the autumn period (positive correlation with C. poecilopus) and in abundance per hectare of S. trutta (negative correlation). These results indicate that these factors significantly influence the distribution of this endangered species in the studied catchment and that stocking of S. trutta will impair its recovery.
authors.affiliation: Biology Centre of the Academy of Sciences of the Czech Republic, Institute of Hydrobiology, Na Sádkách 7, 370 05, České Budějovice, Czech Republic.|Faculty of Science, University of South Bohemia, Branišovská 31, 370 05, České Budějovice, Czech Republic.
authors.forename: R
authors.initials: R
authors.lastname: Baran
authors.affiliation: Biology Centre of the Academy of Sciences of the Czech Republic, Institute of Hydrobiology, Na Sádkách 7, 370 05, České Budějovice, Czech Republic.
authors.forename: J
authors.initials: J
authors.lastname: Kubecka
authors.affiliation: Department of Ecology and Environmental Sciences, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, 783 71, Olomouc, Czech Republic.|Správa CHKO Beskydy, Nádražní 36, 756 61, Rožnov pod Radhoštěm, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Kubín
authors.affiliation: Faculty of Science, Ostrava University, 30. Dubna 22, 701 03, Ostrava, Czech Republic.
authors.forename: B
authors.initials: B
authors.lastname: Lojkásek
authors.affiliation: Faculty of Economics, University of South Bohemia, Studentská 13, České Budějovice, Czech Republic.
authors.forename: T
authors.initials: T
authors.lastname: Mrkvička
authors.affiliation: Biology Centre of the Academy of Sciences of the Czech Republic, Institute of Hydrobiology, Na Sádkách 7, 370 05, České Budějovice, Czech Republic.
authors.forename: D
authors.initials: D
authors.lastname: Ricard
authors.affiliation: Department of Ecology and Environmental Sciences, Faculty of Science, Palacký University in Olomouc, Šlechtitelů 11, 783 71, Olomouc, Czech Republic.
authors.forename: M
authors.initials: M
authors.lastname: Rulík
keywords: Alpine bullhead; brown trout; macroinvertebrates; organic carbon; shading; water temperature