John wrote: > By the way, even if some newer studies can find a nuclear difference, we > still have to make a subjective decision about how much of a difference is > sufficient for us to accept them as one or two species.
Our decisions may turn out better (we may reverse ourselves less often) if we can relax our desire for bright lines enough to acknowledge that speciation events can only be recognized retrospectively: there will be cases in which it is simply too soon to tell whether a permanent parting of ways has occurred. A few tens-of-thousands of generations might give us the answer, but at present there may be no fact of the matter. -Geo Kloppel -- Cayugabirds-L List Info: http://www.NortheastBirding.com/CayugabirdsWELCOME http://www.NortheastBirding.com/CayugabirdsRULES http://www.NortheastBirding.com/CayugabirdsSubscribeConfigurationLeave.htm ARCHIVES: 1) http://www.mail-archive.com/cayugabirds-l@cornell.edu/maillist.html 2) http://www.surfbirds.com/birdingmail/Group/Cayugabirds 3) http://birdingonthe.net/mailinglists/CAYU.html Please submit your observations to eBird: http://ebird.org/content/ebird/ --
