An experimental study on genetic drift in hatchery population of red sea bream.
An experimental study on genetic drift in hatchery population of red sea bream.
复制标题
真鲷孵化群体遗传漂变的实验研究.
DOI：
10.2331/suisan.54.739
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发表时间：
1988
影响因子：
0.4
通讯作者：
S. Umeda
中科院分区：
文献类型：
--
作者：
K. Sugama;N. Taniguchi;S. Umeda
采用电泳生化标记法对不同产卵日期的红鲷进行了遗传分析。在产卵季节，每隔5天从池中自然产卵中采集5次用于播种的卵。我们已经检测到在不同日期产生的后代的等位基因频率有显著差异。有人认为，遗传漂变导致的等位基因频率差异是由于每次产卵日产生的亲本数量太少，个体差异太大所致。根据这一论点，我们估计在每个产卵日期中有遗传贡献的亲本的实际数量从8到16不等，尽管放置在水箱中的亲本总数为130。与野生种群相比，混合孵化场样本的遗传变异也有所减少。多态性位点数量减少40%，每个位点等位基因数量减少12.2%，观察到的杂合度减少18.0%。这些结果必须在人工养殖红鲷鱼以增加自然种群时加以考虑。
Genetic analyses of red sea bream hatched from eggs spawned on different dates were carried out by using electrophoretic biochemical markers. Eggs for seeding were collected from natural spawning in tank 5 times at 5 day intervals during spawning season. We have detected significant differences in allele frequencies among the offsprings spawned on different dates. It is argued that the difference in allelic frequency caused by genetic drift is due to too few number and different in-dividuals of parents spawned on each spawning date. With this argument, we estimated that the actual number of parents genetically contributing in each spawning date varied from 8 to 16, although the total number of parents placed in tank was 130. A reduction of genetic variability was also found in the pooled hatchery samples when comparing to the wild population. The magnitude of reduction was 40% in the number of polymorphic loci, 12.2% in the number of allele per locus and 18.0% in observed heterozyosity. These results have to be considered in the artificial produc-tion of red sea bream for enhancement of natural stock.