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This shows that the birds with bigger beaks were able to survive longer and reproduce, because their beaks were big enough to break open and eat larger seeds. (shown in mm)

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Which microevolution caused the medium ground finch beak to increase in size on Daphne Major from 1976-1978?

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Which microevolution caused the medium ground finch beak to increase in size on Daphne Major from 1976-1978?

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

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

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This can show that the beaks, as the years went on, got bigger to accommodate for the lack of water, perhaps being able to drink more water for longer stretches without that resource. (shown in mm)

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1)It just doesn't make sense if near every bird died if everything was the same. Genetic drift would have taken far too long, longer than a two year period, migration would have increased the population and had two different types of birds on the island. Natural selection is the only reasonable explanation to why the beaks increased in size. Again, if every beak was exactly identical, through every single generation, the entire population of the medium ground finch would have died off, if not for some unique gene.
2)As you can see in one graph, it shows that throughout the two years on Daphne Major, the beaks increasing in size over the shortages. This could have been used to pick up the resource needed to survive.
3) On the other graph, it is shown that the beak also increased in size when a food shortage hit. If every bird were to have had the exact same beak, they would all be dead, so there had to have been some unique feature on the island that allowed a select few birds to live.

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1) in 1977, a drought occurred and as a result, the entire portocala seed population died, and as a result, the birds with a smaller beak died.  2) in a graph, it shows that the beak size from '76-'78 gradually increased in size, while the small beak went down in size, in terms of population. (shown) 3)In the drought, you can easily see that birds with more defined beaks lived, while the ones without much distinction between them couldn't get water, and died.