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Natural selection caused the beak of the medium ground finch population to increase on Daphne Major from 1976 to 1978.

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Birds with larger becks have better survival chances.

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Birds with larger becks have better survival chances.

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I know this because they have the availability to eat the seeds that the birds with short beaks can't get to because their becks are larger and stronger. also for an example the tribulus plant has at least 2 more seeds per square meter because most of the birds couldn't get to them over the two years. Knowing this only the birds with long beaks can get to the tribulus seeds and they live because there are more tribulus seeds when the portulaca population went down in the drought in 1977.

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I know this because short beak genes start to disappear due to the drought causing the gene pool to favor long beaks because of their sufficient food source so when the long beak bird population increases the small beak decreases. An example of this is in 1776 the average beak length was 10.7095206 and in 1778 average beak length was 11.6067741 this is a very large change in a two year period this is natural selection at its finest.

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Large Beck finches had a better food source.

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Large Beck finches had a better food source.

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I know this because the drought in 1977 had only 20mm of rain and it wiped out portulaca (soft small seed) to almost 0. the small beck finch food source but the tribulus plant stayed alive through the drought but only big beak birds could eat them because the seeds were big and hard and their beaks were thicker and stronger than the small beaks. This is why the small beck finches population started to decrease. The data from lab 18 showed that from 76 to 78 the beck average size increased significantly.

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This is what can eat the tribulus because of the thick long strong beck.