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繁殖盛期雄性普通东方小蛙的个体大小不影响交配成功率
作者姓名:FrancisLEMCKERT
作者单位:School of
摘    要:通过比较抱对和非抱对普通东方小蛙(Crinia signifera) 的吻尾干骨长(体长) 和检测个体较大或状态较好的雄体是否为成功繁殖个体, 检测雌蛙体长与交配成功的雄蛙的体长和相对状态(体重/体长) 之间是否存在线形关系, 评估交配与个体大小之间的关系。在实验室内, 令未交配雌体选择随机选出的雄体, 观测雌体是否与最大的雄体交配; 将抱对的蛙暴露于其它雄蛙, 观测其它较大或较小的雄蛙是否取代已抱对的雄蛙。结果表明: 抱对雄蛙和雌蛙的个体大小无显著的关系, 成功交配的雄蛙并不比未交配的雄蛙大, 其它雄蛙不能取代已抱对的雄蛙。在这一C. signifera种群中, 繁殖盛期雄性个体的大小似乎不影响交配成功率, 在此期间即便存在配偶选择, 亦决定于与雄性个体大小无关的其它因素。在更长的繁殖期内, 雄性个体大小则与交配成功率有关, 这是该种的典型特征。

关 键 词:普通东方小蛙  配偶选择  抱对  个体大小  个体状态

Body size of male common eastern froglets Crinia signifera does not appear to influence mating success during explosive breeding events
FrancisLEMCKERT.Body size of male common eastern froglets Crinia signifera does not appear to influence mating success during explosive breeding events[J].Acta Zoologica Sinica,2005,51(2):232-236.
Authors:Francis LEMCKERT
Abstract:I assessed if mating common eastern froglets Crinia signifera exhibited size-related patterns. I compared the snout-urostyle lengths and body condition of amplexing males with that of non-amplexing males to determine if successful males were larger or in better condition. I assessed if there was a linear relationship between the body length of the female and the successful male and the relative condition of the male (measured by body mass versus length). In the laboratory,unmated females were placed with randomly chosen males to determine whether,given the opportunity,females would be found mating with the largest available males. I exposed amplexing pairs to other males to determine if larger or smaller males would displace amplexing males. No significant relationship was found between the body sizes of amplexed males and females and successful male frogs were not significantly larger than unmated males. Amplexing males were never displaced by other males. For this population of C.signifera,the body size of males does not appear to play a significant role in determining mating success during "explosive" breeding. Mate selection,if present,is based on factors unrelated to male body size and this situation may not hold true during more prolonged breeding events,which are also typical of this speciesActa Zoologica Sinica 51(2):232-236,2005].
Keywords:Eastern froglet  Crinia signifera  Mate selection  Amplexus  Body-size  Condition
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