Colonization of Drosophila subobscura in Chile I. First population and cytogenetic studies
Colonization of Drosophila subobscura in Chile I. First population and cytogenetic studies
复制标题
果蝇在智利的定殖 I. 首次种群和细胞遗传学研究
作者：
D. Brneie;A. Prevosti;M. Budnik;M. Monclus;J. Ocaña
1978年2月，在蒙特港（智利）发现了古北种果蝇（Drosophila subobscura）。该物种在这个国家的扩张非常迅速，现在它被发现超过至少2000公里的南北距离。新建立的种群非常繁荣，并显示出高度的倒位染色体多态性。根据目前的染色体排列，可以提出一个关于创始人群体的起源和特征的假设。可能，创始人来自西班牙东部或东南部，并形成了一个由10个或更多个人组成的团体。D.智利的subobscurain似乎遵循世界性物种的扩张模式，被动地由人类运输，而不是卡森的殖民过程模型中设想的与人类活动联系较少的殖民者的更积极的扩张。在D.在智利的subobscurain，符合这种解释。
In February 1978, in Puerto Montt (Chile) the palearctic speciesDrosophila subobscurawas detected. The expansion of the species in this country has been very rapid, and now it is found over a distance of at least 2000 km North-South. The newly established populations are very flourishing and show a high degree of inversion chromosomal polymorphism. On the basis of the chromosomal arrangements present, an hypothesis can be formulated about the origin and characteristics of the founder group. Possibly, the founders came from Eastern or South Eastern Spain and formed a group of 10 or more individuals. The colonization ofD. subobscurain Chile seems to follow the model of expansion of a cosmopolitan species, passively transported by man rather than the more active expansion of colonizers less tied to human activity, envisaged in Carson's models of colonization processes. The high level of chromosomal polymorphism observed in the populations ofD. subobscurain Chile, coincides with this interpretation.