Nadler Steven A, Hafner Mark S, Hafner John C, Hafner David J
Museum of Natural Science, and Department of Zoology and Physiology, Louisiana State University, Baton Rouge, LA, 70803, USA.
Moore Laboratory of Zoology and Department of Biology, Occidental College, Los Angeles, CA, 90041, USA.
Evolution. 1990 Jul;44(4):942-951. doi: 10.1111/j.1558-5646.1990.tb03816.x.
Genetic variation among populations of chewing lice (Geomydoecus actuosi) was examined in relation to chromosomal and electrophoretic variation among populations of their hosts (Thomomys bottae) at a contact zone. Louse demes were characterized by low levels of genetic heterozygosity (H̄ = 0.039) that may result from founder effects during primary infestation of hosts, compounded by seasonal reductions in louse population size. Louse populations sampled from different hosts showed high levels of genetic structuring both within and among host localities. Microgeographic differentiation of louse populations is high (mean F = 0.092) suggesting that properties of this host-parasite system promote differentiation of louse populations living on different individual hosts. Among-population differentiation in lice (F = 0.240) was similar to that measured among host populations (F = 0.236), suggesting a close association between gene flow in pocket gophers and gene flow in their lice.
在一个接触区域，研究了咀嚼虱（Geomydoecus actuosi）种群间的遗传变异与其宿主（汤氏囊鼠，Thomomys bottae）种群间染色体和电泳变异的关系。虱群的特点是遗传杂合性水平较低（平均H̄ = 0.039），这可能是由于宿主初次感染时的奠基者效应，再加上虱种群数量的季节性减少所致。从不同宿主采集的虱种群在宿主局部区域内和区域间均表现出高度的遗传结构。虱种群的微地理分化程度很高（平均F = 0.092），这表明该宿主 - 寄生虫系统的特性促进了生活在不同个体宿主上的虱种群的分化。虱种群间的分化（F = 0.240）与宿主种群间测量的分化（F = 0.236）相似，这表明囊鼠的基因流动与其虱的基因流动之间存在密切关联。
