布氏田鼠的择偶行为

MATE CHOICE IN BRANDT′S VOLES ( MICROTUS BRANDTI)

在实验室通过布氏田鼠对配偶与陌生异性鼠、已交配［刚刚和别的雌（雄）鼠进行交配］和未交配异性鼠、熟悉（刚刚和选择鼠进行交配）和陌生异性鼠三种情况下配偶选择的实验研究，结果表明：雌性布氏田鼠对配偶的选择显著地要多于陌生雄鼠；虽然对陌生和熟悉雄鼠选择差异不显著，但对陌生鼠的选择强度要高于熟悉雄鼠；同时对已交配和未交配雄鼠的选择无显著差异。雄性布氏田鼠虽然对配偶和陌生雌鼠的选择差异不显著，但对陌生雌鼠的选择显著高于熟悉雌鼠；虽然在一些行为指标上对已交配与未交配雌鼠选择无显著性差异，但在访问次数和爬跨行为上差异显著。因此，我们推断布氏田鼠的婚配制度以混交制占主导地位，同时也存在一雄多雌制的情况。

The mate choice of Brandt′s voles Microtus brandti was investigated in the laboratory to study the mating system of this species. It was found that the female voles spent significantly more time visiting the partners than the strange males, but the male voles did not show any preference of the partners to the strange females. A female vole showed no difference in the copulatory behavior between an unfamiliar male and a familiar male which had copulated with her for 15 minutes, but she visited and fought the unfamiliar male significantly more than the familiar male. A male vole significantly preferred visiting and mating with an unfamiliar oestrous female to a familiar female which had copulated with him for 15 minutes. A female vole showed no difference in any behavior between an unfamiliar and unmated male and an unfamiliar male which had just mated with a no experimentative oestrous female vole. A male vole visited and mated with the unmated females significantly more than the females mated before the experiment. Based on these data, we suggested that the principal mating system of Brandt′s voles might be promiscuous and/or polygyny.