title: Evidence for introgression in differentiated North-American and Finnish Drosophila montana populations.
abstract: The virilis group species Drosophila montana is widely distributed around the northern hemisphere. Here we show that it consists of at least two well differentiated populations (Finnish and North-American populations) that have been diverging for the last 0.55-0.95 My. These populations show significant chromosomal, behavioural and morphological differences, but no apparent postzygotic isolation. Evidence for introgression is found for both Finnish and North-American populations at two out of the three X-linked genes (fused, elav and su(s)) studied here. In the light of these findings, previously reported evidence for selective sweeps in D. montana populations is re-evaluated.
authors.affiliation: Structural and Molecular Biology Department, Institute for Molecular and Cell Biology, University of Porto, Rua do Campo Alegre 823, 4150-180 Porto, Portugal.
authors.forename: Seliina
authors.initials: S
authors.lastname: Päällysaho
authors.forename: Cristina P
authors.initials: CP
authors.lastname: Vieira
authors.forename: Anneli
authors.initials: A
authors.lastname: Hoikkala
authors.forename: Jorge
authors.initials: J
authors.lastname: Vieira
mesh_terms: D000413:Alaska; D000818:Animals; D000835:Animals, Wild; D002170:Canada; D004330:Drosophila / Q000235:genetics*; D005387:Finland; D017344:Genes, Insect / Q000235:genetics*; D005828:Genetics, Population; D006824:Hybridization, Genetic / Q000235:genetics*; D008297:Male; D014589:Utah