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Which Microevolution caused the beak of the medium ground finch population to increase on Daphne Major from 1976 to 1978

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Natural selection caused the beak of the ground finch to increase in size

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In about 1983 they had the most rainfall reaching up to almost 1500 mm of rain and they had the least amount of rainfall around 1987 with 0 mm of rain

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The portulaca had an average of 5 seed per square meter per month while Tribulus had about 7 seed per square meter per month

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In 1976 the Depth of the beaks averaged to about 10 mm while the length of the beaks averaged to about 11 mm while in 1978 the beaks depth averaged to about 11 mm while the length of the beaks averaged to about 12 mm

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After looking at the evidence the drought highly impacted the finches because in only 5 years there was a 1500 mm rainfall difference so they went from having to much water to not having any at all and also between those years there was most likely an average rainfall so they probably had more plants to eat and thrive off of but now they don't have any

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The seeds from the plants helped the longer beaked birds survive longer because it was easier for the longer beaks to get the food they need from the Tribulus and Portulaca and harder for the smaller beaks because the beaks were to small to eat the big plants without their beaks cracking

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in 2 years the beaks grew 1 mm, this helped the birds because when there was a drought the water was far underground which made it hard for short beaked birds to get to so the birds with longer beaks had an advantage because they could reach underground and get to that water causing them to survive longer and causing the short beaked bird to die off quicker