Mating season aggression and fecal testosterone levels in male ring-tailed lemurs (Lemur catta)
Mating season aggression and fecal testosterone levels in male ring-tailed lemurs (Lemur catta)
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DOI：
10.1006/hbeh.2000.1585
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发表时间：
2000-05-01
影响因子：
3.5
通讯作者：
Pereira, ME
中科院分区：
文献类型：
--
作者：
Cavigelli, SA;Pereira, ME
挑战假说（J.C.温菲尔德河E. Hegner，B. G. Ball和A. M. Duffy，1990，Am. Nat 136，829-846）提出，在鸟类、爬行动物和鱼类中，“在社会不稳定的情况下，如在形成支配关系、建立领土边界、或同种雄性为争夺领土或获得配偶而发起挑战的过程中，作为T[eatrium]效应的生殖攻击的频率或强度最强”（第833页）。为了确定这一假设的扩展到哺乳动物物种，我们测试了预测的假设在nonparental，季节性繁殖，原猴纲灵长类动物（环尾狐猴，狐猴卡塔）。半自由放养的男性进行了研究期间的社会稳定（交配期）和不稳定（交配期）。每年的交配季节包括几天，在此期间，男性争取获得滥交组女性，因为每个人都成为性接受1天。男性的侵略率进行了比较，交配前和交配期间的粪便睾酮水平。交配前雄性的攻击率与睾酮水平无显着相关。相比之下，在交配季节睾酮和侵略水平呈正相关，显着。然而，在发情期前的几天，男性的侵略率与睾酮没有显着相关，但在发情期的日子里，当侵略性的挑战急剧上升，睾酮和侵略高度正相关。这些结果表明，挑战假说适用于哺乳动物以及鸟类，爬行动物和鱼类。此外，睾酮水平的升高与发情期的天数密切相关，这表明睾酮水平升高的成本和收益之间存在妥协。(C)北京大学出版社.
The challenge hypothesis (J. C. Wingfield, R. E. Hegner, B. G. Ball, and A. M. Duffy, 1990, Am. Nat 136, 829-846) proposes that in birds, reptiles, and fish, "the frequency or intensity of reproductive aggression as an effect of T[estosterone] is strongest in situations of social instability, such as during the formation of dominance relationships, the establishment of territorial boundaries, or challenges by a conspecific male for a territory or access to mates" (p. 833). To determine the extension of this hypothesis to mammalian species, we tested predictions of the hypothesis in a nonpaternal, seasonal breeding, prosimian primate (ring-tailed lemurs, Lemur catta). Semi-free-ranging males were studied during periods of social stability (premating period) and instability (mating period). The annual mating season consists of several days during which males fight for access to promiscuous group females as each individually becomes sexually receptive for 1 day. Male rates of aggression were compared to fecal testosterone levels within premating and mating periods. In the premating period male rate of aggression was not significantly correlated with testosterone level. By contrast, during the mating season testosterone and aggression levels were positively and significantly correlated. However, on days just preceding estrus, male rate of aggression was not significantly correlated with testosterone, but on days of estrus, when aggressive challenges peaked sharply, testosterone and aggression were highly positively correlated. These results suggest that the challenge hypothesis applies to mammals as well as to birds, reptiles, and fish. In addition, elevations in testosterone were tightly circumscribed around days of estrus, suggesting a com-promise between costs and benefits of elevated testosterone levels. (C) 2000 Academic Press.