| evidence for introgression in differentiated north-american and finnish drosophila montana populations. | 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 th ... | 2005 | 15954499 |
| male courtship song and female preference variation between phylogeographically distinct populations of drosophila montana. | understanding the variation within and between populations in important male mating traits and female preferences is crucial to theories concerning the origin of sexual isolation by coevolution or other processes. there have been surprisingly few studies on the extent of variation and covariation within and between populations, especially where the evolutionary relationships between populations are understood. here we examine variation in female preferences and a sexually selected male song trai ... | 2007 | 17542854 |
| phylogeographic patterns in drosophila montana. | the drosophila virilis species group offers valuable opportunities for studying the roles of chromosomal re-arrangements and mating signals in speciation. the 13 species are divided into two subgroups, the montana and virilis 'phylads'. there is greater differentiation among species within the montana phylad in both karyotype and acoustic signals than exists among members of the virilis phylad. drosophila montana is a divergent species which is included in the montana phylad. here, we analyse th ... | 2007 | 17305862 |