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Morphological comparison of two populations of the Smooth Newt, Triturus vulgaris, from western Anatolia

Abstract Individuals of the Efes population of Triturus vulgaris were found to be significantly smaller than other populations of the nominate subspecies in Turkey. This difference had been found previously and thus seems to be constant over the years. Comparison was made with a population from Manisa, which is only 110 km away from Efes, but is separated by the Bozdağlar Mountains up to 2159 m high. Males in particular differ significantly in various morphometric characters, whereas females were found to be quite similar. The question of whether the difference between the two populations can be attributed to environmental factors or may be due to genetic isolation is discussed. Some external characters such as the form of the crest and the tail tip were shown not to be constant over the years and are thus not useful for taxonomic analysis.