Milishnikov A N, Rafiev A N, Muntianu A I
Institute of Ecology and Evolution, Russian Academy of Sciences, Moscow, Russia.
Genetika. 1998 Jul;34(7):947-52.
Genotypic variability in two Moldovian populations of moundbuilder mice Mus spicilegus Pet. was examined at different stages of their life cycle--at the beginning of overwintering in mounds and in the middle of summer in agrocenoses. Thirty allozymes were assayed. Significant differences in allele frequencies and heterozygosity between overwintered and mice born in the year of the experiment were recorded only for Idh-1. This fact was related to the presence of differential mortality among overwintered mice in the populations by the middle of summer. The increase in heterozygosity for Idh-1 in the populations occurred because of "old" mice that lived until the middle of summer, at which point they still have not contributed to the gene pool of the population. The genetic effect of the annual separation of generations of mound-builder mice due to their overwintering in mounds is analyzed. Overwintering has a bottleneck effect on the population. The relatively low genetic variability in mound-builder-mice populations is considered with regard to their biological and ecological features. Based on obtained data, a conclusion on the high genetic stability of moundbuilder-mice populations during their entire life cycle is made.
在摩尔多瓦的两个种群中，对筑丘鼠（Mus spicilegus Pet.）生命周期不同阶段的基因型变异性进行了研究，研究阶段分别为在土丘中越冬开始时以及在农田生态系统中夏季中期。检测了30种同工酶。仅在异柠檬酸脱氢酶-1（Idh-1）方面，记录到越冬鼠和实验当年出生的小鼠之间等位基因频率和杂合度存在显著差异。这一事实与到夏季中期时种群中越冬鼠存在差异死亡率有关。种群中Idh-1杂合度的增加是由于活到夏季中期的“老年”小鼠，此时它们仍未对种群的基因库做出贡献。分析了筑丘鼠因在土丘中越冬而导致世代年度分离的遗传效应。越冬对种群具有瓶颈效应。结合筑丘鼠的生物学和生态学特征，对其种群中相对较低的遗传变异性进行了探讨。基于所获数据，得出筑丘鼠种群在其整个生命周期中具有高遗传稳定性的结论。
