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首页> 外文期刊>Ethology >Assortative Pairings in Diamond Firetails (Stagonopleura guttata) are not the Result of Mutual Mate Choice for an Ornament
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Assortative Pairings in Diamond Firetails (Stagonopleura guttata) are not the Result of Mutual Mate Choice for an Ornament

机译：钻石火尾（Stagonopleura guttata）中的配对不是饰物相互选择的结果

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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.
机译：当具有相似表型的个体彼此交配的频率高于偶然发生的交配时，就会发生积极的分类交配。在雄性和雌性都被装饰的物种中，由于对同一性状的相互择偶而可能产生各种配对。我们在钻石火尾（Stagonopleura guttata）中测试了这种选择配偶和配对配对的机制，这是一种澳大利亚的雌性雀科，其中的两性都饰有红色的钞票，红色的瘤状体和白色的侧翼斑点。先前我们已经显示出装饰程度的性别差异，因为女性的侧面斑点比男性更多。这些白色的侧面斑点是在性爱展示期间使用的，在向男性展示时，向男性求情，女性完全展示出来。在这里，我们实验性地测试了彼此的交配偏好是否基于侧面斑点的数量。没有证据表明直接优先选择现货号。如果选择了具有自然或实验控制数量侧翼斑点的潜在伴侣，雄性会优先选择具有更多斑点的雌性，而雌性的偏好并不仅仅基于侧翼斑点。有趣的是，在野生和圈养的钻石尾鱼中，我们发现成对的侧翼斑点数量是相关的，这为阳性配对配对提供了基础。尽管如此，我们得出的结论是，钻石火尾中的配对并不是由于基于侧面斑点的数量而相互选择。我们讨论了每种性别的不同选择途径。

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