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Article: Lab 18. Environmental change and evolution.

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Article: Lab 18. Environmental change and evolution.

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https://docs.google.com/document/d/1q6g4Qb0QOTc1NJXjZskMLjR0qhHVj0YZkSvIvypkQaU/edit

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As the finches beaks grew, due to them being forced to eat the Tribulus seeds (hard seeds) , so did the medium finches population (bigger beaks). As the genes were being passed on from 1976-1979 the finches beaks adapted to the foods they ate (making them grow bigger due to the Tribulus seeds.

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The Portulaca plant dies off causing them to eat harder seeds. Their population decreased from 751 to 232 from 1976-1979.This caused their beak size to adapt new foods through new generations.

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The finches needed food and most likely began to eat the tribulus plant seeds (harder seeds), which were harder than their normal diets of Portulaca. This caused their beaks to increase from 10.71 mm to 11.61mm.

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The more they (finches with big beaks) reproduced the faster the genes were passed down.

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The Finches struggled to find food and lots of their population died off. 519 finches died by 1976-1979.

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The drought caused the Portulaca (soft) Seed to wither and die. 1974-1976 there was 1180mm of rainfall.

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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.