Evidence for temperature-dependent sex determination in sockeye salmon (Oncorhynchus nerka)
Evidence for temperature-dependent sex determination in sockeye salmon (Oncorhynchus nerka)
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DOI：
10.1139/cjfas-53-1-141
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发表时间：
1996-01-01
影响因子：
2.4
通讯作者：
Wood, CC
中科院分区：
文献类型：
--
作者：
Craig, JK;Foote, CJ;Wood, CC
温度依赖性的性别决定已经在一些动物中得到证实，但在鲑鱼中，性别通常被认为是在严格的遗传控制下。我们观察到扭曲的性别比例，归因于胚胎发育过程中的温度操纵，在1991年进行的实验与溯河产卵和nonanadromous（kokanee）形式的红鲑（Oncorhynchus nerka）从塔卡拉湖，不列颠哥伦比亚省。性别比范围从62%到84%的女性，和偏见的比例不能解释为性别的死亡率差异。在红眼和kokanee的杂交，以及在相互的杂种中独立观察到的效果。在前一年（1989年），来自塔克拉湖的类似杂交，其中孵化温度未被操纵，导致正常（1：1）的性别比例。其他来自同一年（1991年）但没有进行温度控制的红眼和科卡尼种群保持正常的性别比例，就像来自几个不同地点和年份（1986-1994年）的种群一样。初步结论是，发育过程中的温度操纵是通过直接影响性别分化来造成性比偏差的原因。因此，温度依赖性性别决定可能发生在O。nerka，也许还有其他鲑鱼，值得进行严格的测试。
Temperature-dependent sex determination has been demonstrated in several animals, but in salmonids sex is generally believed to be under strict genetic control. We observed distorted sex ratios, attributable to a temperature manipulation during embryonic development, in experiments conducted during 1991 with the anadromous and nonanadromous (kokanee) forms of sockeye salmon (Oncorhynchus nerka) from Takla Lake, British Columbia. Sex ratios ranged from 62 to 84% female, and the biased ratio could not be accounted for by differential mortality by sex. The effect was observed independently in sockeye and kokanee crosses, as well as in the reciprocal hybrids. Similar crosses from Takla Lake in a previous year (1989) in which incubation temperature was not manipulated resulted in normal (1:1) sex ratios. Other populations of sockeye and kokanee from the same year (1991) but undergoing no temperature manipulation maintained normal sex ratios, as did populations from several disparate locations and years (1986-1994). The parsimonious conclusion is that the temperature manipulation during development was responsible for the biased sex ratio through a direct influence on sex differentiation. Hence, the possibility that temperature-dependent sex determination occurs in O. nerka, and perhaps other salmonids, deserves rigorous testing.