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Galapagos Finch Evolution — HHMI BioInteractive Video

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This is a medium ground finch.

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This shows that the portulaca seeds could not make it through the drought, but the tribulus seeds could. Therefore, so did the larger-beaked finches.

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Since the tribulus seed population was increasing, it was able to support a growing large-beaked finch population. This allowed the finches to make more offspring than the small-beaked finches.

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This explains why small-beaked finches were dying. The population got less and less food while the population increased and increased. This led to starvation and making less offspring than the long-beaked finches.

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There is a drought in 1977.

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Tribulus seeds increase sharply over time; larger-beak finch food

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Portulaca seeds sharply decreased over time; small-beak finch food

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Natural selection caused the Beak of the Medium Ground Finch Population on Daphne Major to increase in size from 1976 to 1978.

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Which mechanism of Microevolution caused the Beak of the Medium Ground Finch Population on Daphne Major to increase in size from 1976 to 1978?