Dispersal and ejaculatory strategies associated with exaggeration of weapon in an armed beetle
Dispersal and ejaculatory strategies associated with exaggeration of weapon in an armed beetle
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DOI：
10.1098/rspb.2009.2017
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发表时间：
2010-06
期刊：
影响因子：
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通讯作者：
Takashi Yamane;K. Okada;S. Nakayama;T. Miyatake
中科院分区：
文献类型：
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作者：
Takashi Yamane;K. Okada;S. Nakayama;T. Miyatake
男性战斗中使用的武器对男性来说可能很昂贵，而且经常被报道与其他角色进行交易，如翅膀或生精投资。这项研究调查了增加对武器的投资是否会导致持枪男性交配策略的进化变化。雄性面粉甲虫，Gnatocerus cornutus，有扩大的下颌，用于雄性和雄性之间的竞争。我们对这些武器进行了12代的双向选择，发现了武器和另外两个男性角色之间的权衡：翅膀和睾丸的大小。此外，可能是由于观察到的投资变化的结果，不同品系之间的分散能力和射精量存在显著差异。这表明，武器的夸张可能与散布和射精策略有关。因此，对武器的投资改变可能会导致生活史特征的相关变化。
Weapons used in male fighting can be costly to males and are often reported to trade off with other characters such as wings or spermatogenic investment. This study investigated whether increased investment into weapons can generate evolutionary changes in mating strategy for armed males. Male flour beetles, Gnatocerus cornutus, have enlarged mandibles that are used in male–male competition. We subjected these weapons to 12 generations of bidirectional selection and found trade-offs between weapons and two other male characters: wing and testis size. In addition, probably as a consequence of the observed changes in investment, dispersal ability and ejaculatory volume differ significantly between the lines. This indicates that the exaggeration of a weapon can be associated with dispersal and ejaculatory strategies. Thus, altered investment into weapons can lead to correlated changes in life-history traits.