Natural Selection Cause the Beek of the Medium Ground Finch to Increase in Size by ANDREW WALTER https://padlet.com/andrewwalter24/mscyfpnh1bge en-us 2020-02-07 13:47:44 UTC 2025-12-13 00:59:00 UTC hello@padlet.com Which microevolution caused the beak of the medium ground finch population to increase on Daphne Major from 1976 to 1978? Well the cause of this change is natural selection. andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442140355 2020-02-07 14:02:15 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442140355 There was a drought in Daphne Major in 1976 to 1978 andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442142495 2020-02-07 14:06:27 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442142495 In 1977 the only seed available was the Tribulus seed andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442143156 2020-02-07 14:07:37 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442143156 Portucula seed dies off. andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442144498 2020-02-07 14:10:01 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442144498 The portucula see dies off, not even 1 for every square mile which leaves the medium ground finch with less choices for food meaning they might have to find a harder food that requires a stronger beek and bigger beak to eat. andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442145458 2020-02-07 14:11:48 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442145458 The Tribulus seed became the only available seed in 1977 because of the drought, the other seeds couldn't survive. The Tribulus seed is a much harder seed than any other seed the medium ground finch is used to therefore they can't eat it as easily kind of like humans eating a very cooked not tender steak when they are used to a juicy tender steak. This caused the beeks to naturally evolve into bigger stronger beaks that could eat larger harder foods. andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442146862 2020-02-07 14:14:17 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442146862 In 1977 the rainfall was inly 130mm which is not a lot at all considering the average rainfall here in St Louis is 42 inches which is 1066.8mm. This very low amount of rain caused animals and seeds to die off. andrewwalter24 https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442152811 2020-02-07 14:24:10 UTC https://padlet.com/andrewwalter24/mscyfpnh1bge/wish/442152811