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The winds turn in Dr. Balsai's favor....New species evolution amoung Peripheral Isolate Coruciap

Brian-SFCRC Sep 15, 2003 08:30 AM

SOUTHERN FLORIDA CORUCIA RESEARCH CENTER (SFCRC)

Location: LEE/1.

Hello Everyone,

Although based on miscarriages alone as some locales have had 100% success with different combo Corucia(regarding different species of Corucia being the reason) There is evidence that there may be some Validity to Dr. Balsai's theories.

I came across this piece by William R. Corliss that I will post here for those who haven't seen it.

HOMOLOGY VS. DNA

"Until the molecular biologists recently arrived on the scene , evolutionary family trees were based upon similarities in appearance; that is HOMOLOGY. Animals that look alike must be closely related. But molecular biologists have discovered that some animals that seem identical to the eye differ significantly in their DNA complements.

Thus, the Pacific skinks may undermine homology. Inhabiting many, far-separated Pacific islands, these small lizards all look pretty much alike externally. For many years, biologists assumed that they all belonged to the same species. Recently, scalpels in hand, they found that the skink innards differed enough to define two species: Emioa cyanura and Emoia impar.

Next, the molecular biologists got in the act. They discovered that the mitochondrial DNA (mtDNA) of the Guam and Kosrae skinks differed by an amazing 6%, even though both skinks were E. cyanura. Even worse, the Vanuatu skink (E. impar) differed from ALL the other E. impar skinks around the Pacific by an astounding 13%. Yet, to the eye, they all looked alike. So much for Homology. -UNLESS there is something basically wrong with molecular biology. Biologists now suspect that there are many more "cryptic species" animals that look alike but possess substantially different DNA complements."

(Cohen, Philip; "Lizards Keep Their Differences to Themselves," New Scientist, p.17, July 6, 1996).

The molecular results on Corucia forthcoming could prove VERY interesting.

Sincerely,
Brian
SFCRC

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Replies (2)

zeteki Sep 15, 2003 03:48 PM

Segregation of populations into species is fairly arbitrary. There are no really good, set rules on what defines a species.

I like to use the definition that animals of the same species will produce viable offspring, however even that doesn't work in some cases (ie ring species).

So I become curious - has anyone produced E. cyanura x E. impar hybrids? And were the offspring fertile? What about the other species in the genus?

-Z

zeteki Sep 16, 2003 07:50 PM

Sorry, I meant to ask:

Has anyone produced reproductively viable E. impar offspring by breeding E. impar from different islands? Same question for E. cyanura.

-Z

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