Seasonal and Social Correlates of Fecal Testosterone and Cortisol Levels in Wild Male Muriquis (Brachyteles arachnoides)
Seasonal and Social Correlates of Fecal Testosterone and Cortisol Levels in Wild Male Muriquis (Brachyteles arachnoides)
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DOI：
10.1006/hbeh.1998.1505
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发表时间：
1999-04
影响因子：
3.5
通讯作者：
K. Strier;T. Ziegler;D. Wittwer
中科院分区：
文献类型：
--
作者：
K. Strier;T. Ziegler;D. Wittwer
为了研究季节性性行为与环境条件的关系，在巴西米纳斯吉拉斯的Estação Biológica de Caratinga的19个月时间里，分析了6只野生雄性小鼠(Brachyteles Arachnoides)的粪便睾酮和皮质醇水平。基于六只雄鼠每周样本的群体平均睾酮水平在交配和非交配期间或雨季和旱季之间没有差异。皮质醇水平确实随着交配周期的变化而变化，在第二个旱季，当交配在异常多的雨季之后继续时，皮质醇水平显著高于第一个旱季，当交配停止时。男性在荷尔蒙变化的时间上表现出个体差异，但荷尔蒙水平和性行为都与男性年龄无关。尽管在交配季节开始和交配前后睾酮波动的时间存在个体差异，但所有雄性在交配季节开始时睾酮略有增加后，皮质醇浓度都会升高。随着雨季和交配季节的到来，睾酮水平没有明显变化，皮质醇没有提前增加，这都可能与雄性小鼠在接触配偶时表现出的低水平的公开攻击性有关。
Fecal testosterone and cortisol levels were analyzed from six wild male muriquis (Brachyteles arachnoides) over a 19-month period at the Estação Biológica de Caratinga in Minas Gerais, Brazil, to investigate the hormonal correlates of seasonal sexual behavior and environmental conditions. Group mean testosterone levels based on weekly samples from the six males did not differ between copulatory and noncopulatory periods or between rainy and dry seasons. Cortisol levels did change with copulatory periods, and were significantly higher during the second dry season, when mating continued following an exceptionally heavy rainy season, than during the first dry season, when mating ceased. Males exhibited individual variation in the timing of their hormone shifts relative to their sexual activity, but neither hormone levels nor sexual activity were related to male age. Despite individual differences in the timing of testosterone fluctuations around the onset and offset of the copulatory season, all males exhibited elevated cortisol concentrations following a slight increase in testosterone at the beginning of the copulatory season. Both the lack of significant changes in testosterone levels with the onset of the rainy and copulatory season and the lack of prebreeding increases in cortisol may be related to the low levels of overt aggression displayed by male muriquis over access to mates.