Stress Response and the Value of Reproduction: Are Birds Prudent Parents?
Stress Response and the Value of Reproduction: Are Birds Prudent Parents?
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DOI：
10.1086/597610
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发表时间：
2009-05-01
影响因子：
2.9
通讯作者：
Chastel, Olivier
中科院分区：
文献类型：
--
作者：
Bokony, Veronika;Lendvai, Adam Z.;Chastel, Olivier
在脊椎动物中，饥饿或捕食者攻击等应激刺激刺激循环糖皮质激素的快速升高，引发有助于立即生存但同时抑制繁殖的生理和行为反应。这种应激反应被认为是生活史权衡的生理调节者：当当前繁殖的价值相对于未来繁殖和生存的价值较高时，减轻的应激反应有望使成功繁殖和最大化适应性成为可能。使用系统发育比较分析，我们调查了基线和峰值压力诱导的血浆皮质酮水平在64种鸟类的父母照顾。我们发现，（1）物种与当前的育雏相对于未来的育种安装较弱的皮质酮反应在急性应激，（2）在物种中，更多的女性偏向的父母照顾有较弱的皮质酮反应。这些结果支持育雏值假说，表明压力反应的进化作为一个适应性的基础上的生活史策略。此外，我们发现（3）基线皮质酮与育雏值呈正相关，与体重呈负相关，（4）峰值皮质酮在高纬度物种繁殖中更高。后一项研究结果表明，循环皮质酮浓度可能与筑巢期间的预期需求和风险相匹配。
In vertebrates, stressors such as starvation or predator attacks stimulate the rapid elevation of circulating glucocorticoid hormones, triggering physiological and behavioral responses that aid immediate survival but simultaneously inhibit reproduction. This stress response has been proposed to serve as a physiological mediator of life-history trade-offs: when the value of current reproduction is high relative to the value of future reproduction and survival, a mitigated stress response is expected to enable successful breeding and maximize fitness. Using phylogenetic comparative analyses, we investigated baseline and peak stress-induced plasma corticosterone levels during parental care in 64 bird species. We found that (1) species with a higher value of the current brood relative to future breeding mounted weaker corticosterone responses during acute stress, and (2) females in species with more female-biased parental care had weaker corticosterone responses. These results support the brood value hypothesis, suggesting that the stress response evolves as an adaptive basis for life-history strategies. Further, we found that (3) baseline corticosterone correlated positively with brood value and negatively with body mass, and (4) peak corticosterone was greater in species breeding at higher latitudes. The latter findings suggest that circulating corticosterone concentrations might be matched to the anticipated demands and risks during nesting.