Joined: Feb. 2006
|Quote (Southstar @ Nov. 09 2011,06:39)|
|[quote=George,Nov. 09 2011,04:45][quote=Dr.GH,Nov. 08 2011,12:23] |
|Quote (Southstar @ Nov. 08 2011,09:39)|
I've just finished reading a paper in the New Journal of Botany on the evolution and taxonomy of the narrow-leaved marsh orchid complex (within Dactylorhiza) in Britain, Ireland and the rest of Europe. These have all originated as allopolyploids of the same two diploid species in apparently four separate episodes. In other words, two species hybridise and the hybrid undergoes genome duplication, which results in instant reproductive isolation (more or less). Biogeographical and molecular evidence suggests that three species evolved after the last glacial maximum, whereas the fourth predates it. What's really interesting are the differences in ecological (habitat) preferences shown by these four species, which serves to further isolate each species from the others, setting them on separate evolutionary trajectories.
Could you give me a link to the paper.
http://www.ingentaconnect.com/content....rt00002 should work. If not, let me know and I'll see what I can do.