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Weathering the storm: parental effort and experimental manipulation of stress hormones predict brood survival

机译:渡过难关:父母的努力和压力荷尔蒙的实验操纵可预测育雏期

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摘要

BackgroundUnpredictable and inclement weather is increasing in strength and frequency, challenging organisms to respond adaptively. One way in which animals respond to environmental challenges is through the secretion of glucocorticoid stress hormones. These hormones mobilize energy stores and suppress non-essential physiological and behavioral processes until the challenge passes. To investigate the effects of glucocorticoids on reproductive decisions, we experimentally increased corticosterone levels (the primary glucocorticoid in birds) in free-living female tree swallows, Tachycineta bicolor, during the chick-rearing stage. Due to an unprecedented cold and wet breeding season, 90 % of the nests in our study population failed, which created a unique opportunity to test how challenging environmental conditions interact with the physiological mechanisms underlying life-history trade-offs.
机译:背景不可预测的恶劣天气的强度和频率不断增加,挑战着生物体做出自适应反应的能力。动物应对环境挑战的一种方式是通过分泌糖皮质激素应激激素。这些激素调动能量存储并抑制不必要的生理和行为过程,直到挑战过去。为了研究糖皮质激素对生殖决策的影响,我们在雏鸡饲养阶段实验性地提高了自由活动雌性树燕子Tachycineta bicolor的皮质酮水平(鸟类中的主要糖皮质激素)。由于史无前例的寒冷和潮湿的繁殖季节,我们研究种群中90%的鸟巢都失败了,这为测试具有挑战性的环境条件如何与生活史取舍的生理机制相互作用提供了独特的机会。

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