Bergmann's rule and the Italian Hermann's tortoises (Testudo hermanni): latitudinal variations of size and shape
2007
Sacchi, Roberto | Pupin, Fabio | Rosa, Daniele Pellitteri | Fasola, Mauro
We used geometric morphometric analysis to investigate latitudinal variation in size and shape of carapace and plastron of 111 Testudo hermanni hermanni (60 males and 51 females) collected in 6 different Italian regions. Basing on a sample of 14 landmarks for carapace and 18 landmarks for plastron, we showed that the size and shape of both sexes changed according to a North-South cline following the Bergmann's rule, tortoises of Northern Italy being 1.1-1.2 larger than that of Southern Italy. Shape variation was higher in carapace probably because sexual selection in this species acts stronger on plastron than on carapace shape.
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