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Mating pattern,female reproduction,and sexual size dimorphism in a narrow-mouthed frog(Microhyla fissipes)

Guo-Hua Ding  Jie Wei  Zhi-Hua Lin  Li Wei  Xiao-Li Fan  Yun Tang  
【摘要】:To study sexual size dimorphism(SSD),mating pattern and female reproduction in a population of Microhyla fissipes,we collected the amplexus pairs from the field and measured the snout-vent length(SVL) of male and female in amplexus pairs,female reproductive traits and fertilization rate.Amplexed female was larger than amplectant males and female-larger pairs were more happened in M.fissipes.Mean male SVL was greater in male-larger pair than in female-larger pair.Post-spawning body mass,clutch size,egg dry mass and clutch dry mass were not differed between two amplexus pairs.Male SVL was positively related to female SVL within each amplexus pair.After accounting for female SVL,males in male-larger pairs were larger than those in female-larger pairs.The ratio of male to female SVL was not related to fertilization rate within each amplexus pair.The mean fertilization rate did not differ between two amplexus pairs.These results suggested that(1) M fissipes has the female-biased SSD,and the degree of SSD is 0.96 in our studied population;(2) size-assortative mating exist in M.fissipes;(3) females with larger body size are preferred for males due to higher fecundity,while body size of males is not important for fertilization rate in M.fissipes.

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