The effect of sex ratio on size-assortative mating in two explosively breeding anurans

in Amphibia-Reptilia
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Size-assortative mating (SAM) is a widespread phenomenon related to individual fitness. In our study, we examined: (i) the appearance of SAM, and (ii) the effect of sex ratio on intensity of SAM in wild populations of two explosively breeding anurans, common frogs, Rana temporaria, and common toads, Bufo bufo. Despite a higher male-biased operational sex ratio (OSR) in toads, the body lengths of the paired males and females were significantly correlated only in frogs. Increasing male-male competition, assessed via the OSR, resulted in a stronger correlation also in frogs only. Thus, great variability in the presence and intensity of SAM has been observed within both studied species.

The effect of sex ratio on size-assortative mating in two explosively breeding anurans

in Amphibia-Reptilia



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