Byrne K, Nichols R A
Queen Mary and Westfield College, University of London, U.K.
Heredity (Edinb). 1999 Jan;82 ( Pt 1):7-15. doi: 10.1038/sj.hdy.6884120.
Genetic variation was quantified between surface-dwelling populations of Culex pipiens and the so-called molestus form found in the London Underground (the Underground) railway system. The molestus form is a commercially important biting nuisance and in the southern part of its range is also a disease vector. The surface and subterranean populations were genetically distinct, with no evidence of gene flow between closely adjacent populations of the different forms, whereas there was little differentiation between the different populations of each form. The substantially reduced heterozygosity in the Underground populations and the allelic composition suggest that colonization of the Underground has occurred once or very few times. Breeding experiments show compatibility between the Underground populations but not with those breeding above ground. There is evidence of greater gene flow and a mixing of molestus and pipiens traits in the south of the species range. This paper considers the processes that may allow establishment of reproductive isolation in the north of the species range but not in the south.
对尖音库蚊的地表栖息种群与在伦敦地铁系统中发现的所谓“骚扰型”进行了遗传变异量化研究。骚扰型是一种具有重要商业意义的叮咬害虫，在其分布范围的南部还是一种病媒。地表种群和地下种群在基因上是不同的，没有证据表明不同类型的紧邻种群之间存在基因流动，而每种类型的不同种群之间几乎没有分化。地下种群中显著降低的杂合性和等位基因组成表明，地铁环境的定殖只发生过一次或极少几次。繁殖实验表明，地下种群之间具有兼容性，但与地表繁殖的种群不兼容。有证据表明，在该物种分布范围的南部存在更大的基因流动以及骚扰型和尖音型特征的混合。本文探讨了可能导致该物种在分布范围北部而非南部建立生殖隔离的过程。
