An empirical study for clarifying roles of sexual selections in evolution of male traits of fiddler crabs using robots.

通过对招潮蟹（Uca属）螯肢形态的观察和实验，探讨了性内选择和性间选择对招潮蟹性饰进化和侧化的影响。虽然使用机器人模仿螃蟹的求偶行为的实验还不完整，但我们发现，在表现出发达社会行为的乳招潮中，异爪雄性之间的战斗往往比同爪雄性之间的战斗持续时间更长。这一结果的分歧，美国。乳酸菌与那为你。vomerisas和不同物种之间的螯形态的差异表明，维持侧化的机制将不同的招潮蟹物种。

Field observations and experiments were conducted for fiddler crabs (genus Uca) with some comparisons in morphology of their chelae in order to clarify the effects of intra- and inter-sexual selections on evolutions of sexual ornaments and of the laterality. Although the experiments using robots that mimic courtship behaviors of crabs have been incomplete, we found that fights between hetero-claw males tend to last longer than those between homo-claw males in Uca lactea that exhibits developed social behaviors. The disagreement of this result for U. lactea with that for U. vomerisas well as difference in morphology of chelae between the species indicates that the mechanism for maintaining the laterality would differ between Uca species.