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Identifier uch.biology.msc//2000chalkia
Title Μελέτη της μορφολογικής και γενετικής ποικιλομορφίας του είδους Podarcis erhardii (Sauria: Lacertidae) στη δυτική Κρήτη
Alternative Title Study on the morphological and genetic variability of the species Podarcis erhardii(Sauria:Lacertidae)in western Crete.
Creator Chalkia, Dimitra
Abstract Thirty- two external characters and sequencing data derived from a 294 bp fragment of the mitochondrial cytochrome b gene, were used in order to study morphological and genetic variability of the species Podarcis erhardii in western Crete. Statistical analysis of the morphological characters revealed no substantial grouping among the populations studied. In contrast, analysis of the sequence data revealed two dinstict lineages among them. The first lineage consists of the "continental" populations of Samaria and Azogyres, while the second one associates the "insular" populations of Souda, Gramvousa, Elaphonisi and Prasonisi. The resulting phylogenetic trees, the nowadays distribution of the populations and the geological history of the island contribute to form a phylogeographical hypothesis for the expansion of P. erhardii in southern Greece. The common ancestor of the species P. erhardii is more possible to have reached the island of Crete through the Peloponnisos region than through Cyclades. The "insular" populations might be the resultant of island radiation and should have undergone severe temporary reductions in size (bottlenecks) until the island shaped steadily. The Cretan populations group together with the peloponnesian Podarcis, and this affinity holds even when all European species of the genus are concluded in the analysis. The Greek taxa seem to be closely related with the Italian and the Western islands groups, while the phylogenetic affinities with the Spanish species remain under question.
Issue date 2000-11-01
Date available 2000-11-10
Collection   School/Department--School of Sciences and Engineering--Department of Biology--Post-graduate theses
  Type of Work--Post-graduate theses
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