MadSci Network: Evolution

Subject: VRD - evolution in finches

Date: Thu Jan 20 12:36:11 2000
Posted by Richard
Grade level: School: No school entered.
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Area of science: Evolution
ID: 948393371.Ev

Modern observations on the Galapagos Islands in the Pacific Ocean have
>noted that fluctuations in the food supply for finches cause measurable
>weight differences in successive generations in a matter of just a few
>years. The implicit meaning is that natural selection will favor larger
>birds when food is scarce, while smaller birds will become weaker faster
>and thus die faster. Yet we are told evolution takes thousands of years.
>Please reconcile the time factor. Are these observations actually
>evolution in action over a short time frame?

Re: VRD - evolution in finches

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