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Juvenile coloration of lizards
Bauerová, Anna ; Frynta, Daniel (advisor) ; Rehák, Ivan (referee)
This work summarizes the current knowledge about the coloration of the lizards - the mechanism of colour creation, to color (pigments and structural colors) and hormonal influence on the body colour. It deals with the possible functions of the coloration (antipredator, social, thermoregulation) and its creation. Further it is an overview of the works about juvenile coloration that deal with hypotheses about the function which the juvenile coloration in lizards performs. There are also mechanisms of juvenile coloration and influencing factors mentioned. The thesis includes an experimental part dealing with various coloration characters of juvenile and adult Eublepharidae. We chose several characters: striped tail of the juveniles, striped body of the juveniles, light stripe on the head of the juveniles, striped tail of the adults, striped body of the adults, light stripe on the head of the adults. On several phylogenetic trees we evaluated whether these are the derived characters. After comparing the trees it turned out that in the case of juvenile coloration it is probably an ancestral character. In the case of adult pattern we have not reached a clear conclusion. Key words: juvenile coloration, ontogenetic color change, lizards
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Phylogenetic assesment of cultural characters
Gillová, Lucie ; Frynta, Daniel (advisor) ; Rexová, Kateřina (referee)
Phylogenetic methods have been used for analysing cultural characters extensively in the last ten years. This bachelor thesis starts with a brief overview and characteristics of the methods used for these analyses and then it deals with all three main fields where these methods have been applied. The first one of them is the analysis of manuscripts and their relations which is unique in that even non-cladistic methods bring usually good results. The second field discussed in this thesis is the anthropological characters, including both artefacts of material culture and various features of social orders. The last one deals with the analysis of languages and language families. In all the chapters, different approaches to different data are listed and the most important studies are described in detail. The thesis also attempts to find negative and positive sides of different approaches.
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The effects of mating with multiple males on reproductive success of a female: An experimental study in leopard gecko (Eublepharis macularius)
Ševčíková, Pavlína ; Frynta, Daniel (advisor) ; Rehák, Ivan (referee)
The aim of the project was to test female advantages of promiscuous and/or polyandrous mating. Although, previous studies reported improved reproductive success of females copulating with multiple males in many model species, including Eublepharis macularius, this study failed to demonstrate such a benefit of polyandry. Traits reflecting female reproductive success, i.e. the number of produced eggs, egg mass, hatchability, hatchling mass, growth and survival were not influenced by copulation with multiple partners, but some of them were dependent on female condition. Only initial stages of juvenile growth were influenced by female identity and/or investment.
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