A small badge of longevity: opposing survival selection on the size of white and black wing markings
A small badge of longevity: opposing survival selection on the size of white and black wing markings
复制标题
长寿小徽章：白色和黑色翅膀斑纹大小上的反对生存选择
DOI：
--
复制
发表时间：
2017
期刊：
影响因子：
--
通讯作者：
P. Hõrak
中科院分区：
文献类型：
--
作者：
T. Sepp;Kalev Rattiste;L. Saks;Richard Meitern;Janek Urvik;A. Kaasik;P. Hõrak
根据障碍原则，夸张的装饰性特征理应给其持有者带来成本。然而，对于装饰表达是否以及在什么条件下与生存呈正相关，理论和实践上的共识要少得多。我们测量了长寿一夫一妻制海鸟——海鸥（Larus canus）的白色翼斑和黑色翼尖大小与年龄相关的变化和生存选择。雄性比雌性有更大的白斑，但无论性别如何，斑块大小都与年龄呈凹关系，这表明白斑大小在两性中都容易衰老。翼尖磨损的程度与白斑的大小呈负相关，这表明，与扎哈维障碍假说一致，只有拥有最大装饰物的个体才能维护它们，而不需要支付展示它们的费用。白色翼斑和黑色翼尖的面积呈负相关。无论性别如何，生存选择都偏爱具有较大白色翼斑和较小黑色翼尖的鸟类，这表明白色和黑色翼纹可能作为单一装饰品的反向组成部分共同进化。总而言之，我们的结果提供了证据，证明雌性对观赏性状的生存选择并不弱于雄性。大多数观察到的模式不存在性别差异，这与以下预测一致：在双亲照料的一夫一妻制长寿物种中，相互的择偶选择导致两性复杂的装饰性状的进化。
本文受版权保护。版权所有。
According to handicap principle, exaggerated ornamental traits are supposed to exert costs on their bearers. However, there is much less theoretical and practical consensus about whether and under which conditions ornament expression should positively correlate with survival. We measured age-related variation and survival selection on the size of white wing patches and black wing tips in a long-lived monogamous seabird, the common gull (Larus canus). Males had larger white patches than females but patch size showed concave relationship with age irrespective of sex, suggesting that white patch size was prone to senescence in both sexes. Extent of wing tip abrasion correlated negatively with the size of white patch, suggesting, in agreement with the Zahavian handicap hypothesis that only individuals with largest ornaments are able of maintaining them and not paying cost of displaying them. Areas of white wing patches and black wing tips correlated negatively. Irrespective of sex, survival selection favored birds with larger white wing patches and smaller black wing tips, which suggests that white and black wing markings may have coevolved as reverse components of a single ornament. Altogether, our results provide an evidence for the case where survival selection on ornamental traits in females is not weaker than in males. Absence of sex differences with respect to most of observed patterns is consistent with a prediction that among monogamous long-lived species with biparental care, mutual mate choice leads to evolution of elaborate ornamental traits in both sexes.
This article is protected by copyright. All rights reserved.
对比个体间和个体内特征对长寿海鸟死亡风险的影响
影响因子：
4.8
作者：
Zhang H;Vedder O;Becker PH;Bouwhuis S
通讯作者：
Bouwhuis S