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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
The effect of steroid hormones on sexually dimorphic bone growth in geckos
 Tureček, Adam ; Kubička, Lukáš (advisor) ; Frýdlová, Petra (referee)
The sexual size dimorphism (SSD) is widespread among animals but proximate mechanisms of its ontogeny are still poorly understood even in important groups of vertebrates such as reptiles. Previous experiments in geckos showed that growth of both sexes slows substantially at their older age. Their SSD develops considerably a long time after sexual maturity, it is associated with earlier growth deceleration in the smaller sex and it is controlled by ovarian rather than testicular steroids. The aim of the thesis was to explore the previous knowledge by studying the ontogenesis of the sexually-dimorphic bone growth of the gecko Paroedura picta, the male- larger species with the most explored proximate mechanisms of SSD among geckos. I was most interested in the ontogeny of the growth plates activity and the epiphyseal ossification of the femur in both sexes and their relationship to age, body length, gonadal activity and levels of sex-specific steroids (estradiol and testosterone). The results show that P. picta has determinate growth and that epiphyseal ossification does not contribute to the SSD. The femoral growth plates close at the same age in both sexes; however, their closure occurs at smaller body length in females than in males. In the context of this and the previous studies, estradiol or other...
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Ecological and phylogenetic effects determining variation of growth patterns in amniotes
 Stanková, Veronika ; Frýdlová, Petra (advisor) ; Vohralík, Vladimír (referee)
Growth is a process during which organs or the whole body enlarges. It can be modeled by using growth models and curves. The work is mainly focused on the explanation of two types of growth - the determinate growth, which is finished after the reaching of the sexual maturity, and the indeterminate growth which on the other side continues even after the reproduction or after the reaching of the sexual maturity. In the literature there is generally stated that birds and mammals are characterized by the determinate growth, amphibians and reptiles have the indeterminate growth. The aim of this work was to analyze the current available literature relevant to the growth and to evaluate the above mentioned statements about the growth of the vertebrates. The ecological and the phylogenetic effects influencing the growth, the physiological regulation and the mechanism of the growth are summarized in this work. Powered by TCPDF (www.tcpdf.org)
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