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Phylogeography of the species Psammodromus algirus
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Resumo(s)
In this work phylogenetic and phylogeoraphic analyses are conducted on the species Psammodromus algirus based on samples from the Iberian Peninsula and Morocco with the goal of resolving the controversy relative to this subject that exists in the literature. Four genes were used (12s, 16s, cytochrome b and NAD4) which were analysed one by one and concatenated in different combinations. The results differed from dataset to dataset if the trees were rooted; in the case of unrooted trees, the results were relatively congruent. The phylogenetic approach was thus not enough to resolve the addressed issues and reach satisfying conclusions regarding the species present biogeographic patterns. In order to address this issue a population approach was made with a larger number of samples. With the combined results from both approaches it was possible to propose an explanation for this species past migrations which is different from the ones presented in former publications. Furthermore, software was developed in the context of this thesis, which is very useful in phylogenetic/phylogeographic analyses. The program's purpose is to make data matrix conversions (FASTA to Nexus to FASTA with several program requirements in mind) and concatenation (of up to five Nexus data files) an easy task, that anyone with minimum computer skills can easily use it. The chapter about this software is the content of a paper which is in press in at the time of writing this thesis. Finally, comments are weaved on the outcome of this thesis, and brief remarks are made on the future of the two main components of this work
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Descrição
Tese de mestrado em Biologia (Biologia Evolutiva e do Desenvolvimento), apresentada à Universidade de Lisboa, através da Faculdade de Ciências, 2007
Palavras-chave
Teses de mestrado Biologia molecular Filogeografia Filogenia