Reproductive isolation with little genetic divergence in sympatric populations of brown trout (Salmo trutta).
Reproductive isolation with little genetic divergence in sympatric populations of brown trout (Salmo trutta).
复制标题
褐鳟（Salmo trutta）同域种群的生殖隔离几乎没有遗传差异。
作者：
N. Ryman;F. Allendorf;G. Ståhl
在瑞典的一个名叫Bunnersjörna的小山湖里，两只被隔离繁殖的褐鲑鱼共存。我们对来自该湖的102个样本进行了电泳性检测，检测了54个基因座编码的27种酶。这两个Deme在一个乳酸脱氢酶基因座(LDH-1)上对不同的等位基因是固定的；在其他五个座位上统计上显著的等位基因频率差异进一步支持了这些Deme之间完全缺乏基因流。两种鱼的生长速度有显著差异，但没有发现进一步的形态分化h-S。鉴于这些发现，这两个种群之间的遗传距离令人惊讶地小(Nei‘s I=0.975)。这些DEME代表了已被鉴定的遗传分化程度最低、繁殖隔离的共域脊椎动物种群之一。从进化论和生态学的角度对研究结果进行了讨论。
Two reproductively isolated demes of brown trout coexist in a small Swedish mountain lake, Lake Bunnersjörna. We electrophoretically examined 102 specimens from that lake for 27 enzymes encoded by 54 loci. The two demes are fixed for different alleles at a lactate dehydrogenase locus (LDH-1); statistically significant allele frequency differences at five other loci further support the complete lack of gene flow between these demes. There are significant differences in growth rates between fish in the two demes, but no further morphological differentiation h-s been detected.--In light of these findings, the genetic distance between these populations is surprisingly small (Nei's I = 0.975). These demes represent one of the least genetically divergent, reproductively isolated sympatric pair of vertebrate populations that have been identified. The results are discussed from both an evolutionary and ecological perspective.