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Evolution by Natural Selection - Darwin's Finches | Evolution | Biology | FuseSchool

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Galapagos Finch Evolution — HHMI BioInteractive Video

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During the time period of 1976 the finches(birds) ended up having a smaller beak in length and depth, because of this it was hard for them to find food for them to eat,The finches had ended up finding food but since there were so many finches with small beaks at the time the finches had ate all their food(Shown from the graph in evidence 3). During the year 1977 the finches learned to reproduce, so they started to reproduce a lot to create more finches, but since the finches had reproduced so much over the time the finches beak started to develop within the length and depth(Shown in evidence 1). During 1976-1978 The finches have decreased this is due to the lack of food and resources,The finches had a huge drought the killed most of the finches in 1977-1978. The finches were also running out of there main food source the portulaca seed, The finches ate the portulaca seed so much that the seed ended up going extinct, this was also another main reason on why finches ended up dying. During 1976-1978 the finches had short/small beaks but now a days the finches had developed their beak over time which means there beak has gotten bigger over time, which is also another reason on why there are more finches now than there was in the 1900s (this was shown from evidence 2).

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Graph 1976-1978

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During the 1976-1978, the population size of the birds had grown and decreased. During 1976 the population size was at its highest of 751 birds. During 1977 the population size began to go down and ended up having a population of 388. The population size in 1978 had decreased a lot over time and ended up being 228.

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During 1976-1978 the Beak length grew to 10.71mm and the depth grew to 9.65mm, this was in 1976. During 1978 the beak length grew to be 11.61mm and the beak depth grew to be 10.55.

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Which mechanism of microevolution caused the beak of medium ground finch population in Daphne major to increase in size from 1976 to 1978?