Your own source uses mules which are incapable of interbreeding as their one and only source for separate species.
Actually it was your source Justa and as I noted previously:
Normally when two species start to develop independently, they reach a point where there are so many genetic differences that animals from the different lineages no longer mate, or their hybrid offspring are sterile - as is the case when a horse and a donkey produce a mule.
Firstly, doesn't that paragraph make sense to you? Isn't that what we'd expect to see if speciation was a thing?
Secondly, that was written by a journalist, not a member of the group who carried out this study.
I told you I would meet you half way in your own beliefs, to which you never responded. If interbreeding does not necessarily mean same species, then lack of interbreeding does not necessarily mean separate species.
I don't why you say "my beliefs", everything I've said comes from the papers and articles we've been looking at, I'm happy to defer to experts who actually study these finches first hand. I don't see much wrong with what you're saying although I'm not sure how important a criteria interbreeding is when new species is classified, I'm sure that there are many more factors that are considered.
As the article above says, it's a "messy business", especially at the earlier stages of speciation.
Name one?????
Mating dances, the songs of males to attract females or the mutual grooming of pairs, are all examples of typical courtship behavior that allows both recognition and reproductive isolation.
See above, name one I have ignored? Certainly if I do it all the time it should be easy to actually name one instead of make bald faced claims. At least I showed you your own definition of subspecies. As well as your own definition of Allopatric Speciation. Neither of which you or them follow. I don’t think you can without it contradicting other well established definitions. I think you are all talk and no show.
Again, it is people who studied the finches first hand, thoroughly and for many years like the Grants or the team who sequenced their genomes who have produced evidence for allopatric speciation, not me.
However....
Reproductive Isolation
The mechanisms of reproductive isolation are a collection of evolutionary mechanisms, behaviors and physiological processes critical for speciation. They prevent members of different species from producing offspring, or ensure that any offspring are sterile. These barriers maintain the integrity of a species by reducing gene flow between related species.[1][2][3][4]
The mechanisms of reproductive isolation have been classified in a number of ways. Zoologist Ernst Mayr classified the mechanisms of reproductive isolation in two broad categories: pre-zygotic for those that act before fertilization (or before mating in the case of animals) and post-zygotic for those that act after it.[5] The mechanisms are genetically controlled and can appear in species whose geographic distributions overlap (sympatric speciation) or are separate (allopatric speciation).
Mating dances, the songs of males to attract females or the mutual grooming of pairs, are all examples of typical courtship behavior that allows both recognition and reproductive isolation. This is because each of the stages of courtship depend on the behavior of the partner. The male will only move onto the second stage of the exhibition if the female shows certain responses in her behavior. He will only pass onto the third stage when she displays a second key behavior. The behaviors of both interlink, are synchronized in time and lead finally to copulation or the liberation of gametes into the environment. No animal that is not physiologically suitable for fertilization can complete this demanding chain of behavior. In fact, the smallest difference in the courting patterns of two species is enough to prevent mating (for example, a specific song pattern acts as an isolation mechanism in distinct species of grasshopper of the genus Chorthippus[11]). Even where there are minimal morphological differences between species, differences in behavior can be enough to prevent mating. For example, Drosophila melanogaster and D. simulans which are considered twin species due to their morphological similarity, do not mate even if they are kept together in a laboratory.
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I really find it hard to accept that after reading all these studies on the Galapagos finches that you can't believe what the researchers are telling you, based on solid evidence. It's not opinion, the birds all came from a single population of the same finches and diversified into the various "types" we see today.
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