Sexual dimorphism in the forelimb muscles of the Asiatic toad Bufo gargarizans
Theory predicts that sexual dimorphism evolves as a consequence of sexual selection. I studied sexual dimorphism in ten forelimb muscles used in the amplexus of Bufo gargarizans (deltoideus, pectoralis, coraco-humeralis longus, coraco-humeralis brevis, sterno-radialis, flexor carpi radialis, extensor carpi radialis, abductor indicus longus, extensor digitorum communis longus and flexor digitorum communis), and three forelimb muscles not involved in amplexus (infraspinatus, latissimus dorsi and triceps branchii). Muscle mass was higher in males for all muscles considered. Males found in amplexus had significantly larger forelimb muscles involved in amplexus than non-amplectant males (exceptions: coraco-humeralis longus and abductor indicus longus), whereas the mass of the three muscles not involved in amplexus did not differ between amplectant and non-amplectant males. My findings suggest that a male-mating advantage depends on the absolute mass of muscles involved in amplexus, in line with the assumption that sexual dimorphism in forelimb muscle mass has evolved under sexual selection.
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Document Type: Research Article
Publication date: October 1, 2012
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- The Herpetological Journal is an international scientific journal that publishes papers on the natural history of amphibians and reptiles. Experimental, observational and theoretical studies are published along with reviews and book reviews. Faunistic lists, letters and results of general surveys are not published unless they shed light on herpetological problems of wider significance.
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