Sexual dimorphism in steppe tortoises (Testudo horsfieldii): influence of the environment and sexual selection on body shape and mobility
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چکیده
منابع مشابه
Sexual dimorphism in lizard body shape: the roles of sexual selection and fecundity selection.
Sexual dimorphism is widespread in lizards, with the most consistently dimorphic traits being head size (males have larger heads) and trunk length (the distance between the front and hind legs is greater in females). These dimorphisms have generally been interpreted as follows: (1) large heads in males evolve through male-male rivalry (sexual selection); and (2) larger interlimb lengths in fema...
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Although the vast majority of higher animals are fixed for one chiral morph or another, the cause for this directionality is known in only a few cases. In snails, for example, rare individuals of the opposite coil are unable to mate with individuals of normal coil, so directionality is maintained by frequency-dependent selection. The snail subgenus Amphidromus presents an unexplained exception,...
متن کاملThe influence of sexual selection and ecological constraints on an extreme sexual size dimorphism in a cichlid
The degree of sexual size dimorphism (SSD) in the cichlid Lamprologus callipterus is the greatest recorded among species in which males exceed females in body size. Males collect and defend empty snail shells in which females breed. We report on the potential importance of different selection mechanisms and constraints on male and female body sizes. To test for the importance of sexual selectio...
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ژورنال
عنوان ژورنال: Biological Journal of the Linnean Society
سال: 2001
ISSN: 0024-4066
DOI: 10.1111/j.1095-8312.2001.tb01323.x