Internal embryonic development in a non-copulatory, egg-laying teleost, the three-spined stickleback, Gasterosteus aculeatus.
Internal embryonic development in a non-copulatory, egg-laying teleost, the three-spined stickleback, Gasterosteus aculeatus.
复制标题
非交配、产卵硬骨鱼、三刺刺鱼、Gasterosteus aculeatus 的内部胚胎发育。
DOI：
10.1038/s41598-019-38584-w
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发表时间：
2019
影响因子：
4.6
通讯作者：
Dean LL
中科院分区：
文献类型：
--
作者：
Dean LL
从产卵到保留和生育活仔的转变是生命史上的一个重大转变。尽管它在鱼类中反复进化，但中间表型的记录非常罕见，只有两种已知的情况下存在正常产卵的鱼类在卵巢内保留胚胎。我们报告发现的第三次发生，其中发育良好的胚胎被发现在卵巢的三刺棘鱼（Gasterosteus aculeatus），非交配，通常卵生的物种。从亲鱼中提取出来的胚胎孵化并生长到成年。对亲鱼和后代的遗传和生理检查排除了孤雌生殖和雌雄同体的发育，因此暗示了雄性刺鱼的内部受精。这一极其罕见的现象可能是由一个不寻常的倾向，女性成为卵结合，并建议，一些重大的转变可能会出现几乎自发的这一人群中。
The switch from egg-laying to retaining and giving birth to live young is a major transition in the history of life. Despite its repeated evolution across the fishes, records of intermediate phenotypes are vanishingly rare, with only two known cases in existence of normally egg-laying fish species retaining embryos within the ovaries. We report the discovery of a third occurrence, in which well-developed embryos were found in the ovaries of a three-spined stickleback (Gasterosteus aculeatus), a non-copulatory, normally oviparous species. Extracted from the parent fish, these embryos hatched and grew to adulthood. Genetic and physiological examination of the parent fish and offspring ruled out development by parthenogenesis and hermaphroditism, therefore implicating internal fertilisation by a male stickleback. This extremely rare phenomenon may have been facilitated in this population by an unusual tendency for females to become egg-bound, and suggests that some major transitions may arise almost spontaneously.