Intense Natural Selection in a Population of Darwin's Finches (Geospizinae) in the Galápagos

Science  02 Oct 1981:
Vol. 214, Issue 4516, pp. 82-85
DOI: 10.1126/science.214.4516.82


Survival of Darwin's finches through a drought on Daphne Major Island was nonrandom. Large birds, especially males with large beaks, survived best because they were able to crack the large and hard seeds that predominated in the drought. Selection intensities, calculated by O'Donald's method, are the highest yet recorded for a vertebrate population.

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