Turelli M, Hoffmann A A
Department of Genetics, University of California, Davis 95616.
Nature. 1991 Oct 3;353(6343):440-2. doi: 10.1038/353440a0.
In Drosophila simulans in California, an inherited cytoplasmic incompatibility factor reduces egg hatch when infected males mate with uninfected females. The infection is spreading at a rate of more than 100 km per year; populations in which the infection was rare have become almost completely infected within three years. Analyses of the spread using estimates of selection in the field suggest dispersal distances far higher than those found by direct observation of flies. Hence, occasional long-distance dispersal, possibly coupled with local extinction and recolonization, may be important to the dynamics. Incompatibility factors that can readily spread through natural populations may be useful for population manipulation and important as a post-mating isolating mechanism.
在加利福尼亚的拟暗果蝇中，一种遗传性细胞质不相容因子会降低受感染雄蝇与未受感染雌蝇交配时的卵孵化率。这种感染正以每年超过100公里的速度蔓延；感染原本罕见的种群在三年内几乎已完全被感染。利用田间选择估计对这种传播进行的分析表明，扩散距离远高于直接观察果蝇所发现的距离。因此，偶尔的长距离扩散，可能与局部灭绝和重新定殖相结合，对种群动态可能很重要。能够轻易在自然种群中传播的不相容因子可能对种群操控有用，并且作为一种交配后隔离机制也很重要。
