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Proximate mechanisms responsible for random mating by size in the Himalayan toad Duttaphrynus himalayanus

In: Animal Biology
Authors:
Lixia Zhang Department of Ecology, College of Life Sciences, Henan Normal University, Xinxiang 453007, China

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Yongsun Sheng Department of Ecology, College of Life Sciences, Henan Normal University, Xinxiang 453007, China

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Xiangyu Yuan Department of Ecology, College of Life Sciences, Henan Normal University, Xinxiang 453007, China

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Fei Yu Department of Ecology, College of Life Sciences, Henan Normal University, Xinxiang 453007, China

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Xueting Zhong Key Laboratory of Vector Biology and Pathogen Control of Zhejiang Province, College of Life Sciences, Huzhou University, Huzhou 313000, China

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Jiahong Liao Ecological Security and Protection Key Laboratory of Sichuan Province, Mianyang Normal University, Mianyang 621000, China

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Zhenhao Liu Ecological Security and Protection Key Laboratory of Sichuan Province, Mianyang Normal University, Mianyang 621000, China

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Wei Chen Ecological Security and Protection Key Laboratory of Sichuan Province, Mianyang Normal University, Mianyang 621000, China

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Abstract

Exploring the mechanisms that affect mating pattern with respect to body size has implications for understanding the evolution of sexual selection. Theory predicts that the absence of a relationship between female body size and fecundity, unbiased operational sex ratio, and a short breeding season will lead to random mating by body size in anuran amphibians. We tested these predictions in the Himalayan toad Duttaphrynus himalayanus inhabiting southeastern Tibet. Our study did not detect any correlation between female body size and number of eggs laid, nor was there a significant difference in the sex ratio of toads captured from the breeding site. In addition, the toads were reproductive for only a short period, from late April to early May (typical of an explosively breeding species). As expected, we detected a weak but not significant relationship between body size of amplexing males and females. Our results revealed no apparent size-assortative pairing in the study population of the Himalayan toad and may contribute to an increasing body of literature on mating patterns in relation to body size in animals with indeterminate growth.

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