This Wednesday(September 23), I was thinking that we should discuss the issue of incomplete speciation and "speciation reversal", i. e. the opposite of speciation. There is a recent TREE-article by Patrik Nosil, Luke Harmon and Ole Seehausen that deals with this issue, and which can be found here.
Personally, I think that the issue of why speciation does not occur, is as important as why it occurs, and hopefully we will learn something new from this article. I think that our study systems (lizards, isopods, damselflies) are almost perfect in many respects to adress these kind of fascinating questions, so please study this article in depth.
Time and place as usual: the "Darwin"-room at 10.00 on Wednesday September 23. Any fika-volunteer?