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How does adaptive radiation differ from allopatric speciation? Allopatry begins when subpopulations of a species become isolated geographically (for example, by habitat fragmentation or migration). The isolated populations are then liable to diverge evolutionarily over many generations. RK 16:07, Aug 12, 2004 (UTC)
- Allopatry implies genetic isolation first, then divergence. Adaptive radiation, as I understand it, implies divergence by niche-separation. Lake Victoria is a common example - one species of fish diverges into many without first having genetic isolation simply because genetic variation partitions the population into various ecological niches where they need not compete or even interbreed. Graft 16:54, 12 Aug 2004 (UTC)
I quite agree that this article seems like it's talking about allopatric speciation except it also occasionally throws the word niche and describes the evolution as relatively rapid. Other than the first few sentances, I don't think this description is true to the real definition of adaptive radiation into different ecological niches. I think it's impossible to do so without a breif explanation of ecological niches within the article.
I changed the "Drosophila_affinidisjuncta" link to "Hawaiian Drosophilidae". It doesn't exist yet but sooner or later I'll get around to writing it. As it was it wasn't very useful. KarlM 06:35, 31 May 2006 (UTC)
I find the statement that monotremes and marsupials evolved from placental mammals very surprising. Is this right?
Just a note that Australia has indigenous rodent and bat species, so the mention of marsupials and monotremes being the only mammals present before human habitation is false.
Agreed, there were plenty of bats, rodents, dingos etc etc etc, so i deleted that line. --Hypo Mix 02:50, 13 November 2006 (UTC)
- This matter has been discussed at talk page for evolutionary radiation. +A.Ou 21:54, 11 February 2007 (UTC)
Should cladogenesis and adaptive radiation be merged?
This site about grazing horses talks briefly about adaptive radiation and cladogenesis, but I think it perverses the meanings in doing so. Then again, the original author of the cladogenesis article may have a twisted definition of cladogenesis in the first place....
Oxford dictionary says cladogenesis divides one species into two, while adaptive radiation does not restrain the number of divisions from one species. Just wanted your input (and then maybe I could move my Hawaiian archipelago addition in the cladogenesis article to the adaptive radiation article instead). Hkim43 04:22, 15 February 2007 (UTC)
I removed a recently added paragraph using "bipedal species...homo sapiens"" as an example. It doesn't seem immediately obvious that this illustrates the concept as described in the article - "rapid speciation...filling many ecological niches". - David Oberst 19:12, 18 February 2007 (UTC)