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早期生活应激通过日本鹌鹑蛋壳色素沉着塑造雌性繁殖策略。

Early life stress shapes female reproductive strategy through eggshell pigmentation in Japanese quail.

作者信息

Duval Camille, Zimmer Cédric, Mikšík Ivan, Cassey Phillip, Spencer Karen A

机构信息

School of Psychology and Neuroscience, University of St Andrews, Westburn Lane, St Andrews, Fife KY169JP, United Kingdom.

School of Psychology and Neuroscience, University of St Andrews, Westburn Lane, St Andrews, Fife KY169JP, United Kingdom.

出版信息

Gen Comp Endocrinol. 2014 Nov 1;208:146-53. doi: 10.1016/j.ygcen.2014.08.013. Epub 2014 Aug 26.

Abstract

Physiological constraints on colouration have been widely reported; especially in birds, which trade-off antioxidant responses against colourful costly signals. One female extended phenotypic trait, which might also highlight important physiological trade-offs, is the pigmentation of their eggshells. In ground-nesting species, producing eggs that are visually undetectable by predators is the best camouflage strategy. However, the condition-dependence of eggshell pigmentation, and the pigments role in oxidative stress, may constrain females to trade-off between their antioxidant capacity and maximising the camouflage of their eggs when they deposit eggshell pigments. Developmental stress is one factor that influences female antioxidant capacity, and could lead to variations in eggshell pigmentation that might have crucial consequences on individual fitness if egg crypsis is compromised especially under stressful conditions. We investigated the interaction between developmental and breeding conditions with respect to eggshell pigmentation in Japanese quail. We studied 30 females that bred under both control and stressful conditions, and were exposed to pre- and/or post-natal stress, or neither. Pre- and post-natal stress independently influenced eggshell pigmentation strategies under stressful breeding conditions. Under stressful reproduction, eggshell protoporphyrin concentration and maculation were affected by pre-natal stress, whereas eggshell reflectance and biliverdin concentration were influenced by post-natal stress. These changes may reflect potential adaptive strategies shaped by developmental stress, but additional data on the benefit of egg crypsis in quail, combined with studies on the role of both pigments on chick survival, will help to clarify whether early life stress can enhance fitness through eggshell pigmentation when developmental and reproductive environments match.

摘要

关于色彩形成的生理限制已有广泛报道;尤其是在鸟类中,它们在抗氧化反应与色彩鲜艳但代价高昂的信号之间进行权衡。雌性的一种扩展表型特征——蛋壳色素沉着,也可能凸显重要的生理权衡。在地面筑巢的物种中,产下不易被捕食者视觉察觉的蛋是最佳伪装策略。然而,蛋壳色素沉着的条件依赖性以及色素在氧化应激中的作用,可能会限制雌性在沉积蛋壳色素时,在抗氧化能力与使蛋的伪装最大化之间进行权衡。发育应激是影响雌性抗氧化能力的一个因素,并且可能导致蛋壳色素沉着的变化,如果蛋的隐蔽性受损,尤其是在压力条件下,这可能会对个体适应性产生关键影响。我们研究了日本鹌鹑在蛋壳色素沉着方面发育条件与繁殖条件之间的相互作用。我们研究了30只在对照和应激条件下繁殖的雌性鹌鹑,它们在产前和/或产后受到应激,或者均未受到应激。产前和产后应激在应激繁殖条件下独立影响蛋壳色素沉着策略。在应激繁殖情况下,蛋壳原卟啉浓度和斑纹受产前应激影响,而蛋壳反射率和胆绿素浓度受产后应激影响。这些变化可能反映了由发育应激形成的潜在适应性策略,但关于鹌鹑蛋隐蔽性益处的更多数据,以及关于这两种色素对雏鸡存活作用的研究,将有助于阐明当发育和繁殖环境匹配时,早期生活应激是否能通过蛋壳色素沉着提高适应性。

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