Asymmetry in genitalia is in sync with lateralized mating behavior but not with the lateralization of other behaviors

Asymmetry in genitalia is in sync with lateralized mating behavior but not with the lateralization of other behaviors
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生殖器的不对称与侧化交配行为同步,但与其他行为的侧化不同步

DOI:
10.1093/cz/zoz019
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发表时间:
2019
期刊:
影响因子:
2.2
通讯作者:
Goyenola
Goyenola
中科院分区:
生物学2区
文献类型:
--
作者:
Torres-Dowdall;Rometsch;Aguilera;Goyenola

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两侧生物体的不对称性吸引了很多好奇心,因为它们明显偏离了正常。它们允许在生物组织的不同水平上研究整合。在这里,我们研究行为和不对称的解剖特征是否以及如何共同进化和共同工作。我们问,如果不对称性是局部决定的每一个特征,或在一个整体的个人水平上,在一个物种轴承明显不对称的生殖器。不对称的生殖器在许多物种中进化;然而,在大多数情况下,不对称的方向是固定的。因此,很少确定生殖器的不对称方向与其他特征之间是否存在关联。在单侧产鱼的属Jenynsia(Cyprinodontiformes,Anablepidae)中,雄性的臀鳍被改造成生殖肢,一种用于使雌性受精的内生殖器官。生殖足显示出明显的不对称性,其尖端向左或向右弯曲。通过对13个线纹哲水蚤自然居群的调查,我们发现两种生殖器变异在野生居群中同样普遍。在实验室人群中进行的一系列实验中,我们发现了多个其他性状的不对称性和偏侧化;然而,它们之间的整合程度差异很大。对不同刺激的探索行为的偏侧化与生殖器形态无关。有趣的是,生殖器不对称的方向与交配偏好的偏侧性和侧线神经瘤的数量呈正相关。这表明整合功能相关的不对称性状,但是,没有证据表明,不对称性是在我们的研究物种在整个个体水平上确定的。
Asymmetries in bilateral organisms attract a lot of curiosity given that they are conspicuous departures from the norm. They allow the investigation of the integration at different levels of biological organization. Here we study whether and how behavioral and asymmetrical anatomical traits co-evolved and work together. We ask if asymmetry is determined locally for each trait or at a whole individual level in a species bearing conspicuous asymmetrical genitalia. Asymmetric genitalia evolved in many species; however, in most cases the direction of asymmetry is fixed. Therefore, it has been rarely determined if there is an association between the direction of asymmetry in genitalia and other traits. In onesided livebearer fish of the genusJenynsia(Cyprinodontiformes, Anablepidae), the anal fin of males is modified into a gonopodium, an intromittent organ that serves to inseminate females. The gonopodium shows a conspicuous asymmetry, with its tip bending either to the left or the right. By surveying 13 natural populations ofJenynsia lineata, we found that both genital morphs are equally common in wild populations. In a series of experiments in a laboratory population, we discovered asymmetry and lateralization for multiple other traits; yet, the degree of integration varied highly among them. Lateralization in exploratory behavior in response to different stimuli was not associated with genital morphology. Interestingly, the direction of genital asymmetry was positively correlated with sidedness of mating preference and the number of neuromasts in the lateral line. This suggests integration of functionally linked asymmetric traits; however, there is no evidence that asymmetry is determined at the whole individual level in our study species.
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