Glucocorticoid response to food availability in breeding barn swallows (Hirundo rustica)
Glucocorticoid response to food availability in breeding barn swallows (Hirundo rustica)
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DOI：
10.1016/j.ygcen.2007.08.011
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发表时间：
2008-02-01
影响因子：
2.7
通讯作者：
Jenni, Lukas
中科院分区：
文献类型：
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作者：
Jenni-Eiermann, Susanne;Glaus, Esther;Jenni, Lukas
在雏鸟的一生中，父母必须在自我维持和生殖投资的竞争需求之间进行权衡。皮质酮是鸟类在应激时释放的一种糖皮质激素，当环境意外恶化时，它可能在调节父母投资方面发挥关键作用。然而，在不可预测的环境条件下繁殖的鸟类并不会增加皮质酮的循环水平，以应对恶劣天气，避免在后代投资高或重新筑巢的可能性低时放弃巢穴。我们调查是否父母谷仓燕子Hirundo rustica，雀形目鸟类的空中昆虫食物的丰富程度取决于天气变化很大，也属于这些物种，或者它是否响应与激活下丘脑-垂体-肾上腺轴的自然变化，昆虫的可用性。我们将父母的血浆皮质酮水平与天气条件，空中昆虫的可用性和父母的身体状况。血浆皮质酮浓度增加时，平均白天温度下降，因此昆虫的可用性下降，身体状况的父母恶化。低温对雏鸟体质量也有负面影响，亲鸟循环皮质酮与雏鸟体质量呈负相关。我们的结论是皮质酮可能参与了父母投资的调节。(C)2007爱思唯尔公司All rights reserved.
Parents feeding altricial nestlings have to trade-off the competing demands of self-maintenance and reproductive investment over their lifetime. Corticosterone, a glucocorticoid hormone released by birds in response to stressors, might play a key role in regulating parental investment when conditions unexpectedly deteriorate. However, birds breeding in unpredictable environmental conditions have been shown not to increase circulating levels of corticosterone as a response to bad weather to avoid nest abandonment when investment in offspring is high or when the probability of re-nesting is low. We investigated whether parent barn swallows Hirundo rustica, a passerine bird whose aerial insect food varies greatly in abundance depending on weather, also belongs to those species or whether it responds with an activation of the hypothalamo-pituitary-adrenal axis to natural variation in insect availability. We correlated plasma corticosterone levels of parents with weather conditions, the availability of aerial insects and parental body condition. Plasma corticosterone concentrations increased when mean daytime temperature declined, and consequently insect availability decreased and body condition of the parents deteriorated. Low temperatures also had a negative effect on body mass of the nestlings and there was a negative relationship between circulating corticosterone of parents and body mass of nestlings. We conclude that corticosterone is probably involved in the regulation of parental investment. (C) 2007 Elsevier Inc. All rights reserved.