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Due to the amount of rainfall in 1977 natural selection came it to play when the portulaca seed died out it left the Tribulus seed left so the birds have to adapt to their environment to get food from the the Tibulus because the rainfall killed all the portulaca seeds

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Which microevolution caused the beak to increase on Daphne major from 76-78

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Natural selection caused the beak to increase on Daphne major from 76-78

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The bird 1978

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The bird 1975

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Hard seed

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Soft seed

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1975- 422mm
1976- 130mm
1977- 20mm
1978- 540mm

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1975
Tribula-5.5
Portulaca- 6.3

1976
Tribula-7.3
Portulaca- 11.3

1977
Tribula-8.3
Portulaca-3.5

1978
Tribula-5.1
Portulaca-0

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1976 population size-751

1977-population size -388              1978 population size-228

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The Tribulus seed is the hard-shelled seed, the portulaca is the soft-shelled one. The drought killed off the soft-shelled portulaca seed and left only the hard-shelled one.  The hard-shelled seed is difficult to eat, but birds with longer deeper beaks could eat the hard-shelled seed easier than the finch birds with short beaks.

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All the birds with short beaks died off due to natural selection for their main food source, the portulaca seed, went extinct and they didn’t have the same adaptations as the birds with long beaks.  And then with only the long-beaked birds left they were the only birds to reproduce, long beak plus long beak equals longer beak.  Explaining the increase in beak length.