Evolution of a conspicuous melanin‐based ornament in gulls Laridae,Journal of Evolutionary Biology

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Evolution of a conspicuous melanin‐based ornament in gulls Laridae
Journal of Evolutionary Biology ( IF 2.1 ) Pub Date : 2020-02-27 , DOI: 10.1111/jeb.13604
Piotr Minias ₁ , Tomasz Janiszewski ₁

Affiliation

Melanin‐ and carotenoid‐based ornaments often signal different aspects of individual quality or similar components of quality under different environmental conditions and, thus, they may become evolutionarily integrated into a composite sexual trait. On the other hand, functionally and developmentally different characters (e.g. coloration characters of different developmental origin) are more likely to evolve independently from each other than more similar traits. Here, we examined evolutionary correlations between the occurrence of a conspicuous melanin‐based ornament (hood) and carotenoid‐based bare‐part ornaments within gull family. We also aimed to identify major ecological, life‐history and biogeographical predictors of hood occurrence and reconstruct evolutionary history of this ornament. We found that hood occurrence was associated with red or dark coloration of unfeathered traits (bill and legs), whereas combinations of hood with yellow carotenoid‐based coloration of integument were evolutionarily avoided. Also, hood occurrence correlated negatively with the occurrence of other melanin‐based plumage character (mantle). Breeding latitude and habitat were identified as major predictors of hood occurrence in gulls, as hoods were recorded more frequently in low‐latitude and inland (rather than marine) species. Finally, our analysis provided support for evolutionary lability in hood occurrence, with a dominance of transitions towards hood loss in the evolutionary history of gulls. The results of our study provide one of the first evidence for a correlated evolution of melanin‐ and carotenoid‐based ornaments in an avian lineage, which supports evolutionary modularity of developmentally and functionally different coloration traits.

中文翻译：

鸥科一种显眼的黑色素装饰物的进化

基于黑色素和类胡萝卜素的装饰品在不同的环境条件下通常表示个体质量的不同方面或质量的相似组成部分，因此，它们可能会在进化上整合为复合性特征。另一方面，功能和发育不同的特征（例如，不同发育起源的颜色特征）比更相似的特征更有可能彼此独立进化。在这里，我们研究了海鸥家族中显着的基于黑色素的装饰物（引擎盖）和基于类胡萝卜素的裸露部分装饰物的发生之间的进化相关性。我们还旨在确定风帽发生的主要生态、生活史和生物地理预测因素，并重建这种装饰品的进化历史。我们发现头巾的出现与无羽特征（喙和腿）的红色或深色有关，而在进化上避免了头巾与基于黄色类胡萝卜素的外皮颜色的组合。此外，头罩的出现与其他基于黑色素的羽毛特征（地幔）的出现呈负相关。繁殖纬度和栖息地被确定为海鸥发生罩盖的主要预测因素，因为罩盖在低纬度和内陆（而不是海洋）物种中被记录得更频繁。最后，我们的分析为头罩发生的进化不稳定性提供了支持，在海鸥的进化历史中，向头罩丢失的转变占主导地位。我们的研究结果为鸟类谱系中基于黑色素和类胡萝卜素的装饰物的相关进化提供了第一个证据，

更新日期：2020-02-27

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