Male pheromones and their reception by females are co-adapted to affect mating success in two subspecies of brown rats.
Male pheromones and their reception by females are co-adapted to affect mating success in two subspecies of brown rats.
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雄性信息素和雌性信息素的接受共同适应影响褐鼠两个亚种的交配成功
DOI：
10.1093/cz/zoaa066
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发表时间：
2021-08
期刊：
影响因子：
2.2
通讯作者：
Zhang JX
中科院分区：
文献类型：
--
作者：
Zhang YH;Zhao L;Fu SH;Wang ZS;Zhang JX
信息素通讯在啮齿动物的社会性行为中起着重要作用。信息素和化学感受系统之间的相互适应在昆虫中已经得到很好的说明，但在啮齿动物和其他哺乳动物中的研究却很少。本研究旨在探讨褐家鼠雄性信息素与雌性信息素之间是否存在共适应现象。我们最近报道，主要尿蛋白（MUP）信息素与雄性交配成功的棕色大鼠亚种，R。n.（Rnh）。在这里，我们发现MUPs的多态性较低，并且在一个parapatric亚种R的雄性中的浓度要低得多。n. caraco（Rnc），比Rnh男性，并发现信息素和父权成功之间没有关联。此外，观察的RNC男性经历了慢性二人接触和建立的优势提交关系显示，占主导地位的男性比下属男性取得更大的交配成功，但他们的MUP水平没有不同的社会地位。这些研究结果表明，雄性交配成功的Rnc大鼠的社会地位，而不是信息素水平和低浓度的MUP可能不是一个可靠的信号，在Rnc大鼠的配偶选择，这是不同的研究结果Rnh大鼠。此外，与Rnh雌性相比，Rnc雌性的信息素受体基因表达减少，MUP信息素激活的犁鼻器受体神经元数量减少，这表明棕色大鼠雌性信息素的化学感受可能与雄性信息素信号在结构和功能上共适应。
Pheromonal communication plays a key role in the sociosexual behavior of rodents. The coadaptation between pheromones and chemosensory systems has been well illustrated in insects but poorly investigated in rodents and other mammals. We aimed to investigate whether coadaptation between male pheromones and female reception might have occurred in brown rats Rattus norvegicus. We recently reported that major urinary protein (MUP) pheromones are associated with male mating success in a brown rat subspecies, R. n. humiliatus (Rnh). Here, we discovered that MUPs were less polymorphic and occurred at much lower concentrations in males of a parapatric subspecies, R. n. caraco (Rnc), than in Rnh males, and found no association between pheromones and paternity success. Moreover, the observation of Rnc males that experienced chronic dyadic encounters and established dominance–submission relationships revealed that the dominant males achieved greater mating success than the subordinate males, but their MUP levels did not differ by social status. These findings suggest that male mating success in Rnc rats is related to social rank rather than to pheromone levels and that low concentration of MUPs might not be a reliable signal for mate choice in Rnc rats, which is different from the findings obtained in Rnh rats. In addition, compared with Rnh females, Rnc females exhibited reduced expression of pheromone receptor genes, and a lower number of vomeronasal receptor neurons were activated by MUP pheromones, which imply that the female chemosensory reception of pheromones might be structurally and functionally coadapted with male pheromone signals in brown rats.
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