Aggression induced by ornament similarity is limited to females in a mutually ornamented fish, Betta brownorum
Aggression induced by ornament similarity is limited to females in a mutually ornamented fish, Betta brownorum
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由装饰相似性引起的攻击行为仅限于相互装饰的 Betta Brownorum 中的雌性
DOI：
10.1016/j.anbehav.2022.05.018
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发表时间：
2022
期刊：
影响因子：
2.5
通讯作者：
Kutsukake Nobuyuki
中科院分区：
文献类型：
--
作者：
Nomano Fumiaki Y.;Kutsukake Nobuyuki
一个相互吸引的鱼，斗鱼brownorum，显示高装饰变化。我们发现没有优势的大斑点在赢得比赛。相似的斑点大小之间的竞争者增加物理攻击只有在女性。非性的社会选择被认为是有影响力的女性B。在两性中都发现的装饰，或相互吸引，可以被用作对竞争对手的威胁信号，或者对那些共享配偶或其他资源偏好的人进行攻击。普遍存在的男性偏好表明，这些竞争功能的性选择在男性中更强，但这些功能很少在两性之间进行比较。我们调查了一个相互竞争的鱼，斗鱼brownorum，独特的男性偏见和高的内部的性的变化，在存在和大小的侧斑点。无论是斑点大小还是体型大小，都不能预测两性中的赢家。雌性侧显的频率随对手体型的增大而增加。只有女性在面对同样有斑点的对手时，物理攻击才会增加。这些结果表明，非性的社会选择有助于维护斑点比性选择，因为后者预测的威胁信号和/或侵略偏见，主要是在性别更大的服从。我们的研究强调，较小的女性饰品可以有社会功能，是不同于那些男性饰品，并可能在许多其他系统的社会选择部分保持。
HighlightsA mutually ornamented fish, Betta brownorum, shows high ornament variation.We found no advantage of large blotches in winning contests.Similar blotch sizes between contestants increased physical attacks only in females.Nonsexual social selection is suggested to be influential in female B. brownorum.Ornamentation found in both sexes, or mutual ornamentation, can be used as a threat signal towards rivals or to bias aggression towards those sharing preferences for mates or other resources. The widespread male bias in ornamentation suggests that sexual selection for these competitive functions is stronger in males, but these functions are rarely compared between the sexes. We investigated intrasexual contests in a mutually ornamented fish, Betta brownorum, that uniquely has both male bias and high intrasexual variation in the presence and size of side blotches. Neither blotch size nor body size predicted the winner in either sex. The frequency of lateral display increased with opponent body size in females. Physical attacks increased when facing similarly blotched opponents only in females. These results suggest that nonsexual social selection contributes more to the maintenance of blotches than sexual selection, as the latter predicts the threat signal and/or aggression bias mainly in the sex with greater ornamentation. Our study highlights that smaller female ornaments can have social functions that are distinct from those of male ornaments and may be partially maintained by social selection in many other systems.