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首页> 外文期刊>Ecological research >Seasonal change in sexual size dimorphism of the major cheliped in the hermit crab Pagurus minutus
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Seasonal change in sexual size dimorphism of the major cheliped in the hermit crab Pagurus minutus

机译：寄居蟹Pagurus minutus中主要螯虾的性大小二态性的季节性变化

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Sexual size dimorphism is a common phenomenon in the animal kingdom, and its seasonal change has been reported in some species that possess traits dimorphic only in males and specialized for male mating success. However, few studies have examined seasonal change in sexual dimorphism of traits possessed by both sexes. Here, we examined the reproductive biology of the hermit crab Pagurus minutus, at a sandflat in the Waka River estuary, Japan, with special reference to seasonal changes in sexual dimorphism of the large claw (major cheliped) size by conducting population and precopulatory guarding-pair sampling. Previous investigation demonstrated that the major cheliped is used as a weapon, and its size, more than body size, determines the winner in male-male contests of this species. We found ovigerous females from November to April, peaking in January, when 80% of females were ovigerous. Sexual size dimorphism of the major cheliped was observed; the degree of dimorphism increased in the reproductive season, when only males possessed an enlarged major cheliped. In addition, in the reproductive season, precopulatory guarding males had a larger body and larger relative size of the major cheliped than did solitary males, although the major cheliped size in guarding males seemed to reach an upper limit. These results suggest that seasonal change in sexual dimorphism of the major cheliped size in P. minutus strongly reflects sexual selection favoring the development of this natural weaponry, and that the degree of the dimorphism might be limited through natural selection.
机译：有性双态性是动物界的一种普遍现象，据报道其季节性变化在某些仅具有雄性双态且专门为雄性交配成功的物种中发生。但是，很少有研究检查男女拥有的性状的性二态性的季节性变化。在这里，我们研究了日本瓦卡河河口沙滩上的寄居蟹Pagurus minutus的生殖生物学，并特别提到了大白爪（大螯虾）大小的二态性的季节性变化，方法是进行种群繁殖和预先交配的保护，配对采样。先前的调查表明，大螯虾被用作武器，其大小大于身体大小，决定了该物种在雄对雄比赛中的获胜者。我们发现11月至4月有雌雄同体，在一月达到高峰，当时80％的雌雄同体。观察到了主要螯虾的性别大小二态性。当只有雄性具有较大的大螯虾时，生殖期的二态性程度增加。另外，在生殖季节，与单独的雄性相比，在交配前的守卫雄性的大螯虾的身体更大，相对大小更大，尽管在守卫雄性中的大螯虾的大小似乎达到了上限。这些结果表明，小鳞。的主要唇形大小的性二态性的季节性变化强烈反映了有利于这种自然武器发展的性选择，并且该二态性的程度可能受到自然选择的限制。

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