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首页> 外文期刊>Proceedings of the Royal Society. Biological sciences >Corticosterone, testosterone and life-history strategies of birds
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Corticosterone, testosterone and life-history strategies of birds

机译：皮质酮，睾丸激素与鸟类的生活史策略

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摘要

Steroid hormones have similar functions across vertebrates, but circulating concentrations can vary dramatically among species. We examined the hypothesis that variation in titres of corticosterone (Cort) and testosterone (T) is related to life-history traits of avian species. We predicted that Cort would reach higher levels under stress in species with higher annual adult survival rates since Cort is thought to promote physiological and behavioural responses that reduce risk to the individual. Conversely, we predicted that peak T during the breeding season would be higher in short-lived species with high mating effort as this hormone is known to promote male fecundity traits. We quantified circulating hormone concentrations and key life-history traits (annual adult survival rate, breeding season length, body mass) in males of free-living bird species during the breeding season at a temperate site (northern USA) and a tropical site (central Panama). We analysed our original data by themselves, and also combined with published data on passerine birds to enhance sample size. In both approaches, variation in baseline Cort (Cort0) among species was inversely related to breeding season length and body mass. Stress-induced corticosterone (MaxCort) also varied inversely with body mass and, as predicted, also varied positively with annual adult survival rates. Furthermore, species from drier and colder environments exhibited lower MaxCort than mesic and tropical species; T was lowest in species from tropical environments. These findings suggest that Cort0, MaxCort and T modulate key vertebrate life-history responses to the environment, with Cort0 supporting energetically demanding processes, MaxCort promoting survival and T being related to mating success.
机译：类固醇激素在整个脊椎动物中具有相似的功能，但不同物种之间的循环浓度差异很大。我们检验了以下假设：皮质类固醇（Cort）和睾丸激素（T）的滴度变化与鸟类的生活史特征有关。我们预测，在具有较高的成年成年存活率的物种的压力下，Cort将会达到更高的水平，因为认为Cort可以促进降低个体风险的生理和行为反应。相反，我们预测，在短寿命物种中，具有较高交配努力的峰值T在繁殖季节会更高，因为这种激素可促进雄性生殖力性状。我们对温带地区（美国北部）和热带地区（中央）在繁殖季节的自由活动鸟类的雄性中的循环荷尔蒙浓度和关键的生命历史特征（成年成年率，繁殖季节长度，体重）进行了定量。巴拿马）。我们自己分析了原始数据，并结合了有关雀形目鸟类的公开数据，以增加样本量。在这两种方法中，物种之间基线Cort（Cort0）的变化与繁殖季节的长度和体重成反比。应激诱导的皮质酮（MaxCort）也与体重成反比，并且如预测的那样，与成年人的成年存活率也成正比。此外，来自干燥和较冷环境的物种的MaxCort值低于中性和热带物种。 T在热带环境物种中最低。这些发现表明，Cort0，MaxCort和T调节了脊椎动物对环境的关键生命历史响应，其中Cort0支持能量要求高的过程，MaxCort促进生存，而T与交配成功有关。

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