Assortative Pairings in Diamond Firetails (Stagonopleura guttata) are not the Result of Mutual Mate Choice for an Ornament
Assortative Pairings in Diamond Firetails (Stagonopleura guttata) are not the Result of Mutual Mate Choice for an Ornament
复制标题
钻石火尾鱼（Stagonopleura guttata）的选型配对并不是装饰品相互择偶的结果
DOI：
10.1111/eth.12268
复制
发表时间：
2014
期刊：
影响因子：
1.7
通讯作者：
S. Kleindorfer
中科院分区：
文献类型：
--
作者：
Valeria Zanollo;M. Griggio;J. Robertson;S. Kleindorfer
当表型相似的个体相互交配的频率比预期的更高时，就会发生积极的分类交配。在雄性和雌性都具有装饰性的物种中，种类配对可能是由于在同一特征上相互选择配偶而产生的。我们在钻石纤维(Stager Opleura Guttata)上测试了这种择偶和配对的机制，这是一种澳大利亚雌雀，两性都装饰着红色的喙、红色的臀部和白色的侧翼斑点。我们之前已经在装饰程度上显示出性别差异，因为女性比男性有更多的侧翼斑点。这些白色的侧翼斑点在性展示时使用，在求爱的雄性和接近展示的雄性时由雌性充分展示。在这里，我们通过实验测试双方的交配偏好是否基于侧翼斑点的数量。没有证据表明双方对Spot号码有直接的偏好。如果要选择侧翼斑点数量自然或人为操纵的潜在配偶，雄性更喜欢有更多斑点的雌性，而雌性的偏好并不完全基于侧翼斑点。有趣的是，在野生和圈养的钻石火尾中，我们发现成对的侧翼斑点的数量是相关的，这表明了正向配对的基础。然而，我们得出结论，钻石火尾的分类配对并不是由于双方根据侧翼斑点的数量选择配偶。我们讨论了这一性状在不同性别中的不同选择途径。
Positive assortative mating occurs when individuals with similar phenotypes mate more frequently with each other than is expected by chance. In species in which both the males and females are ornamented, assortative pairings could arise from mutual mate choice on the same trait. We test this mechanism of mate choice and assortative pairing in the Diamond Firetail (Stagonopleura guttata), an Australian estrildid finch in which both sexes are ornamented with red bills, red rumps and white flank spots. We have previously shown sex differences in the degree of ornamentation as females have more flank spots than males. These white flank spots are used during sexual display, being fully displayed by courting males and by females when approaching a displaying male. Here, we experimentally test whether mutual mate preference is based on the number of flank spots. There was no evidence for a direct mutual preference for spot number. Given a choice of potential mates with a natural or experimentally manipulated number of flank spots, males preferred females with more spots, while female preference was not solely based on flank spots. Intriguingly, in both wild and captive Diamond Firetails, we found the number of flank spots in pairs was correlated suggesting a basis for positive assortative pairing. Nevertheless, we conclude that assortative pairing in Diamond Firetails is not due to mutual choice of mates based on the number of flank spots. We discuss different selection pathways for this trait in each sex.