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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Secondary sexual ornaments and ectoparasites in the barn swallow (Hirundo rustica)
 Wichová, Eliška ; Albrecht, Tomáš (advisor) ; Sedláček, Ondřej (referee)
Parasites could represent an important evolutionary driver and play an important role in a sexual selection. In the mate selection process, females use secondary sexual ornaments, which may reflect the parasite load and health condition of males. Females would benefit from choosing males with the most extravagant sexual characters, which indicate low levels of parasite infestation. A popular model species for sexual selection study is the barn swallow (Hirundo rustica). However there are no recent studies investigating the relationship between the level of the ectoparasitic infestation and the ornamentation of the barn swallow. Results of this thesis, based on analysis of ectoparasite load in 204 individuals show, that the level of infestation by feather mites is positively correlated with outermost tail feathers and the intensity of feather holes is negatively correlated with a breast coloration. The relationship between the abundance of ectoparasites and white tail spots was not found. The effect of ectoparasites on the survival of individuals or the nest initiation date was not observed. A possitive relationship between the individual seasonal change in feather mites infestation and brood size was detected. This implies a potential trade-off between the investments into parental care and defence...
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Latitudinal trends in prevalence and diversity of parasites and pathogens of vertebrates
 Wichová, Eliška ; Albrecht, Tomáš (advisor) ; Reif, Jiří (referee)
The latitudinal diversity gradient (LDG) indicates a decrease of species richness from equatorial regions toward poles and it is known as a biogeographical pattern applicable for the majority of free-living animals and plant species. Many hypotheses link this phenomenon with a high measure of biotic interactions at low latitudes, which play an important role in the origin and maintenance of species diversity. One of these interactions is the host-parasite relationship. The aim of this thesis is to summary recent investigations of parasitic and pathogenic occurence according to latitude for representative groups of host vertebrates with focus on diversity (number of infectious species per host species) and prevalence (the total number of infected cases per whole population at specific time). Using comparative approaches was revealed, that latitudinal gradient in richness and prevalence is characteristic particularly for vector-born parasites of terrestrial vertebrates and ectoparasites of marine fish.
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