Can captivity lead to inter-species mating in two Mesocricetus hamster species?
Can captivity lead to inter-species mating in two Mesocricetus hamster species?
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DOI：
10.1111/j.1469-7998.2009.00577.x
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发表时间：
2009-08-01
影响因子：
2
通讯作者：
Johnston, R. E.
中科院分区：
文献类型：
--
作者：
delBarco-Trillo, J.;Gulewicz, K.;Johnston, R. E.
在两个亲缘关系密切的物种中，雌性通常更喜欢同种雄性而不是异种雄性。我们发现，发情(但不发情)的叙利亚中仓鼠雌性仓鼠更喜欢同种雄性仓鼠的气味，而不是土耳其仓鼠的气味。然而，雌性叙利亚仓鼠对土耳其雄性仓鼠并不具有攻击性，会很容易地与它们交配。我们推测，多代圈养导致雌性仓鼠避免种间交配的能力下降，这可能与圈养中仓鼠观察到的性接受性增强有关。为了验证这一假设，我们重复了一项在土耳其雌性仓鼠身上进行的研究，该物种目前的实验室种群建立后不久。在这项研究中，在只有20%的互动中，土耳其雌性仓鼠对雄性叙利亚仓鼠表现出前凸，而在80%的配对中，雌性土耳其仓鼠攻击了异种雄性仓鼠。使用原始群体的后代(经过多次圈养和近亲交配)，100%的土耳其雌性仓鼠与异种雄性交配，没有一只表现出对异种雄性的攻击性。因此，雌性避免种间交配可能会受到圈养条件的影响。
In two closely related species, females generally prefer conspecific males over heterospecific males. We found that estrous (but not diestrous) female Syrian hamsters Mesocricetus auratus prefer the odors of conspecific males to odors of Turkish hamsters Mesocricetus brandti. However, female Syrian hamsters are not aggressive toward male Turkish hamsters and will readily mate with them. We hypothesize that many generations in captivity led to a reduction in females' ability to avoid inter-species mating, possibly related to the heightened sexual receptivity observed in Mesocricetus hamsters in captivity. To test this hypothesis, we replicated a study carried out with female Turkish hamsters soon after the current laboratory stock of this species was established. In that study, female Turkish hamsters showed lordosis toward male Syrian hamsters in only 20% of interactions and attacked heterospecific males in 80% of the pairings. Using animals descended from that original colony (after many generations in captivity and certain episodes of inbreeding), 100% of female Turkish hamsters mated with heterospecific males and none showed aggression toward heterospecific males. Thus female avoidance of inter-specific mating may be affected by captive rearing conditions.