Has the following supposed instance of speciation ben refuted?
Another source...
Then I read, on a forum (which of course is not a credible source) -
...the poster who said this did not cite a source.
*****
So now my question:
Is it true that Dobzhansky was able to speciate a strain of fruit flies that was notable to mix with another strain and produce fertile offspring and hence must be classified as a new species?
IF not, then what souces can be sited that show other wise?
http://www.talkorigins.org/faqs/faq-speciation.html
Dobzhansky and Pavlovsky (1971) reported a speciation event that occurred in a laboratory culture of Drosophila paulistorum sometime between 1958 and 1963. The culture was descended from a single inseminated female that was captured in the Llanos of Colombia. In 1958 this strain produced fertile hybrids when crossed with conspecifics of different strains from Orinocan. From 1963 onward crosses with Orinocan strains produced only sterile males. Initially no assortative mating or behavioral isolation was seen between the Llanos strain and the Orinocan strains. Later on Dobzhansky produced assortative mating (Dobzhansky 1972).
Another source...
http://www.rtis.com/nat/user/elsberry/evobio/evc/wre_arch/wre00029.htm
For example, Theodosius Dobzhansky and
Olga Pavlovsky reported(13) in 1971 that a strain of fruit flies they
collected in Colombia was at first fully interfertile with a strain
collected in the Orinoco Basin. They kept the two stocks separate for
about five years, and then crossed them again. This time the male offspring
were completely sterile. A substantial amount of genetic isolation
had developed in only five years.
Then I read, on a forum (which of course is not a credible source) -
http://www.iscid.org/boards/ubb-get_topic-f-6-t-000589-p-4.html
The Darwinians stopped testing their own naive hypothesis when Dobzhansky last failed to produce species through the most intensive selection with Drosophila. Furthermore, much to his credit he admitted his failure.
...the poster who said this did not cite a source.
*****
So now my question:
Is it true that Dobzhansky was able to speciate a strain of fruit flies that was notable to mix with another strain and produce fertile offspring and hence must be classified as a new species?
IF not, then what souces can be sited that show other wise?