Shaking the myth: Body mass, aggression, steroid hormones, and social dominance in wild house mouse
Shaking the myth: Body mass, aggression, steroid hormones, and social dominance in wild house mouse
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DOI：
10.1016/j.ygcen.2015.09.033
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发表时间：
2015-11-01
影响因子：
2.7
通讯作者：
Daniszova, K.
中科院分区：
文献类型：
--
作者：
Hiadlovska, Z.;Mikula, O.;Daniszova, K.
在社会性哺乳动物中，雄性在群体等级中的地位强烈影响着他的繁殖成功。由于较高的社会地位通常是通过与其他雄性竞争获得的，因此选择应该有利于较大的雄性而不是较小的雄性。因此，我们可以预测更快的增长和/或延迟性成熟占主导地位的男性。同样，支配者应该有更高水平的睾丸激素，这种激素在男性支配的许多方面都很重要。不太明显的是显性和皮质酮水平之间的关系，但一般较高的浓度预计在下属的个人。我们研究了身体的生长，性成熟和内分泌的变化，在兄弟对提出的两个家鼠亚种的男性。由于小家鼠是占主导地位的小家鼠的相互遭遇小家鼠的亚种，我们预测更高的生长速度，青春期延迟和侵略，以及更高的睾酮和皮质酮水平在小家鼠男性相比。在所有的比较中，没有发现优势和从属肌兄弟之间的差异。另一方面，在M. M. andericus，占主导地位的男性揭示了不同的增长轨迹和较低的皮质酮水平比下属的男性，但不推迟青春期和较高的睾酮浓度，从而与我们的预测相矛盾。在亚种间的比较，musculus男性成熟较早，但在同一时间成为积极的，作为adulticus男性。肌肉睾酮个体发育表明，在这个亚种的社会地位保持不固定的一段时间，并增加水平可能反映了长期的等级竞争。看来，个体发育的行为和生理特征之间的两个亚种的分歧神秘。(C)2015 Elsevier Inc. All rights reserved.
In social mammals, the position of a male in the group's hierarchy strongly affects his reproductive success. Since a high social rank is often gained through competition with other males, selection should favour bigger males over smaller ones. We may therefore predict faster growth and/or delayed sexual maturity in dominant males. Likewise, dominants should have higher levels of testosterone, hormone important in many aspects of male dominance. Less obvious is the relationship between dominance and levels of corticosterone but generally higher concentrations are expected in subordinate individuals. We studied body growth, sexual maturation and endocrinal changes in males of two house mouse subspecies, raised in fraternal pairs. Since Mus musculus domesticus is the subspecies which dominates mutual encounters with Mus musculus musculus we predicted higher growth rate, delayed puberty and aggression, and higher testosterone and corticosterone levels in domesticus males compared to musculus. In all comparisons, no differences were found between dominant and subordinate musculus brothers. On the other hand, in M. m. domesticus, dominant males revealed a different growth trajectory and lower corticosterone levels than subordinate males but not delayed puberty and higher testosterone concentrations, thus contradicting our predictions. In inter-subspecific comparisons, musculus males matured earlier but became aggressive at the same time as domesticus males. The musculus testosterone ontogeny suggests that social positions in this subspecies remain unfixed for an extended period and that the increasing levels probably reflect prolonged hierarchy contests. It appears that the ontogeny of behaviour and physiological traits diverge cryptically between the two subspecies. (C) 2015 Elsevier Inc. All rights reserved.