在澳大利亚跳跃小鼠，Notomys属中，精子和雄性生殖道的形态多样性是由性别选择决定的吗？,Journal of Zoology

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在澳大利亚跳跃小鼠，Notomys属中，精子和雄性生殖道的形态多样性是由性别选择决定的吗？
Journal of Zoology ( IF 1.9 ) Pub Date : 2020-04-07 , DOI: 10.1111/jzo.12779
W. G. Breed ₁ , X. Ding ₂ , J. Tuke ₃ , C.M. Leigh ₂

Affiliation

跳频小鼠（Notomys属）是澳大利亚古老地方性多啮齿动物中的一类动物，它们在Trimy Hydromyini部落中，其中四个，Notomys alexis， N。mitchellii，N。fuscus和N cervinus发生在干旱或半干旱的环境中。在这里，我们比较了它们在整个物种中的睾丸，精子，附属性腺和外生殖器的大小和形态，并从这些数据得出关于它们可能的繁殖系统的结论。我们显示，野生捕捞的和实验室繁殖的成年猪笼草，福斯猪笼草和米奇猪笼草个体的睾丸非常小，但精子的形态在整个物种中各不相同。腹侧前列腺是目前唯一的大附属性腺，其龟头的阴茎具有非常大的刺。相比之下，鹿猪笼草的睾丸较大，精子变异较小，但形态通常较复杂，精囊和凝结腺大得多，而龟头的阴茎只有小刺。由于在这些繁殖性状N. cervinus更类似于属其他大多数hydromyine啮齿动物的Pseudomys，他们很可能反映了祖先条件的范围内保留Notomys而其他种类的小睾丸，可变的精子，小的精囊，凝固的腺体和大的阴茎棘的生殖特征则可能是最近才衍生的特征。提示宫颈猪笼草相对较大的睾丸质量和形态一致的精子较多，保留了一个交配系统，该系统可能涉及一些雄性精子竞争，而相比之下，其他三个Notomys物种的生殖解剖学表明这些物种表现出一夫一妻制。

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Morphological diversity of the spermatozoon and male reproductive tract in Australian Hopping mice, genus Notomys – is it determined by sexual selection?

Hopping mice (Genus Notomys) are a monophyletic group of Australian Old Endemic murid rodents in the Tribe Hydromyini four of which, Notomys alexis, N. mitchellii, N. fuscus and N cervinus, occur in arid or semiarid environments. Here, we compare the size and morphology of their testes, spermatozoa, accessory sex glands and external genitalia across the species, and from these data, we draw conclusions as to their likely breeding systems. We show that both wild caught and laboratory bred adult N. alexis, N. fuscus and N. mitchellii individuals have extremely small testes, but their spermatozoa vary in morphology across the species. The ventral prostate is the only large accessory sex gland present, and their glans penis has very large spines. By contrast N. cervinus individuals have significantly larger testes with their spermatozoa being less variable but generally more complex in morphology, their seminal vesicles and coagulating glands are much larger, whereas the glans penis has only small spines. Since these reproductive traits in N. cervinus are more similar to those of most other hydromyine rodents in the genus Pseudomys, they are likely to reflect the retention of the ancestral condition within the Notomys lineage whereas the divergent reproductive traits of the other species of tiny testes, variable sperm, small seminal vesicles and coagulating glands and large penile spines are probably more recently derived traits. It is suggested that N. cervinus with its relatively larger testes mass and greater abundance of sperm of more consistent morphology has retained a mating system that may potentially involve some intermale sperm competition whereas, by contrast, the reproductive anatomy of the other three Notomys species suggests that these species exhibit monogamy.

更新日期：2020-04-07

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