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Physical-geographical analysis of the distribution of lynx in the Bohemian Forest
Sladová, Michaela ; Romportl, Dušan (advisor) ; Chuman, Tomáš (referee)
Natural landscape has been changed and forest habitats have been fragmented as a result of human activity. Consequently a decay of forest species has been registered and Eurasian lynx belongs to these threatened species. This wild beast had been exterminated in past in Czech Republic. The Czech and German parts of Šumava Mountains belong to the most forested areas in Europe and therefore they represent convenient areas for a steady occurrence of the mammals which need large areas for their existence. That is why the population of this wild beast was re-established through the use of 24 re-introducted specimen in Šumava Mountains during the 1980s. At present Šumava Mountains represent one of the main central areas of steady occurrence of eurasian lynx in Czech Republic. On the basis of radiotelemetric data coming from 10 individuals of Eurasian lynx (6 males and 4 females) the spatial requirements of this wild beast have been analysed by means of the three following methods: Minimum Convex Polygon, Kernel Home Range and Local Convex Hull. Also the impacts of human activities and relief character have been discussed together with the preference of the provincial cover. It has been found out that the spread of this wild beast is limited by the estate, the traffic infrastructure and fragmentation of...
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A behaviour of the European catfish Silurus glanis in the mating season and for rest of the year with focus on social interactions among individuals
Lüftner, Radek ; Slavík, Ondřej (advisor) ; Randák, Tomáš (referee)
Reproduction ability is the key factor for survival and dispersal of every species. There is, however, only limited information about reproduction of large-bodied fish. Males of European catfish, our biggest native fish, build nests in vegetation and mate there later with females. After succesful mating male guards the nest and takes care of eggs and fry. According to literature, the act of reproduction should take place at nights with water temperature from 18 to 24 řC. However, available records about reproductive behaviour are outdated, fragmentary or come from aquacultures. Thus, a study was designed to evaluate behaviour of European catfish in their natural environment in the Berounka river using radiotelemetry, the results of which I processed in this thesis. Spatial distribution of catfish was followed during the whole year, with special attention on separating mating season from the rest of the year. The goal was to determine conditions characteristic for the mating period and to verify that catfish in the field indeed reproduce in pairs. For this purpose, 10 adults were tracked for two-year period (2002-2004) in the Berounka river by radiotelemetry. Exact positions of all individuals were followed in fourteen-day cycles. In every tracking episode, the position of an individual fish was...
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A behaviour of the European catfish Silurus glanis in the mating season and for rest of the year with focus on social interactions among individuals
Lüftner, Radek ; Slavík, Ondřej (advisor) ; Randák, Tomáš (referee)
Reproduction ability is the key factor for survival and dispersal of every species. There is, however, only limited information about reproduction of large-bodied fish. Males of European catfish, our biggest native fish, build nests in vegetation and mate there later with females. After succesful mating male guards the nest and takes care of eggs and fry. According to literature, the act of reproduction should take place at nights with water temperature from 18 to 24 řC. However, available records about reproductive behaviour are outdated, fragmentary or come from aquacultures. Thus, a study was designed to evaluate behaviour of European catfish in their natural environment in the Berounka river using radiotelemetry, the results of which I processed in this thesis. Spatial distribution of catfish was followed during the whole year, with special attention on separating mating season from the rest of the year. The goal was to determine conditions characteristic for the mating period and to verify that catfish in the field indeed reproduce in pairs. For this purpose, 10 adults were tracked for two-year period (2002-2004) in the Berounka river by radiotelemetry. Exact positions of all individuals were followed in fourteen-day cycles. In every tracking episode, the position of an individual fish was...
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Physical-geographical analysis of the distribution of lynx in the Bohemian Forest
Sladová, Michaela ; Romportl, Dušan (advisor) ; Chuman, Tomáš (referee)
Natural landscape has been changed and forest habitats have been fragmented as a result of human activity. Consequently a decay of forest species has been registered and Eurasian lynx belongs to these threatened species. This wild beast had been exterminated in past in Czech Republic. The Czech and German parts of Šumava Mountains belong to the most forested areas in Europe and therefore they represent convenient areas for a steady occurrence of the mammals which need large areas for their existence. That is why the population of this wild beast was re-established through the use of 24 re-introducted specimen in Šumava Mountains during the 1980s. At present Šumava Mountains represent one of the main central areas of steady occurrence of eurasian lynx in Czech Republic. On the basis of radiotelemetric data coming from 10 individuals of Eurasian lynx (6 males and 4 females) the spatial requirements of this wild beast have been analysed by means of the three following methods: Minimum Convex Polygon, Kernel Home Range and Local Convex Hull. Also the impacts of human activities and relief character have been discussed together with the preference of the provincial cover. It has been found out that the spread of this wild beast is limited by the estate, the traffic infrastructure and fragmentation of...
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