anniemac
Well-known member
I have just read a comment about a population of wolves on the Isle Royale in the US.
This is said to be a natural experiment on the effects of inbreeding alone, with continuing natural selection and no artificial selection for appearance.
The wolves are cut off on the island because ice bridges to the mainland only form when winters are unusually severe.
"The scientists found that 58 percent of the wolves on Isle Royale exhibit a congenital malformation in the lumbosacral region or lower back, and 33 percent display a specific deformity—lumbosacral transitional vertebrae—which can cause full or partial paralysis of the rear legs and tail, as well as back pain."
"For the last 12 years, every one of the dead wolves the researchers have found has displayed bone deformities. In contrast, these deformities occur in only 1 percent of studied wolf populations that are not inbred."
"Up to now, wildlife management agencies in the US and Scandinavia have cited the Isle Royale wolves as proof that small wolf populations can avoid genetic deterioration and remain viable.
"Our study removes one more example that some use to downplay the consequences of genetic deterioration," the Swedish scientist Raikkonen says"
http://www.sciencedaily.com/releases/2009/04/090402171440.htm
Margaret,
I sent you article about moscow strays and how they have watched them evolve since the 1800's. A researcher has studied them and now grouped to 4 categories. Said there are ones that have increased intellegence and actually have mastered the subway system.
Now if there are some with increased intellegence does that mean their brain is bigger? JOKE! Its been a long couple days.
When people start getting into some things that are way deep, it gets me uncomfortable. However, this is what it is like to see evolution being studied. Now, I don't think cavaliers would make the subway no matter how genetically healthy they are.
Ok, no rest last night so just wanted to respond about wolf study but can't copy and past link...
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