Why are birds' eggs colourful? Eggshell pigments co-vary with life-history and nesting ecology among British breeding non-passerine birds
Why are birds' eggs colourful? Eggshell pigments co-vary with life-history and nesting ecology among British breeding non-passerine birds
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DOI：
10.1111/j.1095-8312.2012.01877.x
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发表时间：
2012-07-01
影响因子：
1.9
通讯作者：
Miksik, Ivan
中科院分区：
文献类型：
--
作者：
Cassey, Phillip;Thomas, Gavin H.;Miksik, Ivan
鸟类蛋壳的多彩外观长期以来一直吸引着生物学家，大量的研究工作集中在鸟类蛋壳基质的结构和生物化学上。四吡咯色素的存在是在近世纪前发现的。令人惊讶的是，鸟类蛋壳色素的浓度如何在相关物种之间变化，以及这种变化是否与蛋壳外观和/或物种生活史特征相关，仍然知之甚少。我们量化的两个关键的蛋壳色素，原卟啉IX和胆绿素，从不同的样品储存在自然历史博物馆，特灵，英国的蛋壳的浓度。我们明确地测试了这两种色素是如何与蛋壳着色的物理措施，以及色素浓度和颜色多样性是否与物种间的系统发育关系共同变化。我们还测试了一系列关于两种色素浓度与特定生活史和繁殖生态特征之间关系的比较假设。在物种间，原卟啉和胆绿素的平均浓度呈正相关，两者都与系统发育相关性强烈共变。控制繁殖，原卟啉浓度与腔筑巢和地面筑巢的可能性较高，而胆绿素浓度与非腔筑巢习惯和双亲供应的可能性较高。虽然不太可能被解释为一个单一的功能，繁殖生态和生活史依赖的蛋壳色素浓度在这些比较分析意味着，相关物种共享的色素策略，这些策略涉及到广泛的适应性作用，在鸟类蛋壳着色的变化及其内在机制的演变。(C)2012伦敦林奈学会，林奈学会生物学杂志，2012，106，657672。
The colourful appearance of bird eggshells has long fascinated biologists and considerable research effort has focused on the structure and biochemistry of the avian eggshell matrix. The presence of tetrapyrrole pigments was identified nearly a century ago. Surprisingly, how the concentrations of avian eggshell pigments vary among related species, and whether this variability is associated with either eggshell appearance and/or species life-history traits, remains poorly understood. We quantified the concentrations of the two key eggshell pigments, protoporphyrin IX and biliverdin, from a diverse sample of eggshells stored at the Natural History Museum, Tring, UK. We explicitly tested how these two pigments are associated with physical measures of eggshell coloration and whether the pigment concentrations and colour diversity co-vary with phylogenetic affiliations among species. We also tested a series of comparative hypotheses regarding the association between the concentrations of the two pigments and specific life-history and breeding ecology traits. Across species, the average concentrations of protoporphyrin and biliverdin were positively correlated, and both strongly co-varied with phylogenetic relatedness. Controlling for phylogeny, protoporphyrin concentration was associated with a higher likelihood of cavity nesting and ground nesting, whereas biliverdin concentration was associated with a higher likelihood of non-cavity nesting habit and bi-parental provisioning. Although unlikely to be explained by a single function, the breeding ecology and life history-dependence of eggshell pigment concentrations in these comparative analyses implies that related species share pigment strategies, and that those strategies relate to broad adaptive roles in the evolution of variation in avian eggshell coloration and its underlying mechanisms. (C) 2012 The Linnean Society of London, Biological Journal of the Linnean Society, 2012, 106, 657672.