Founder Effect: Butterflies migrate to a new area. , Organisms form a new colony in a different area. , A small group of spiders float on some debris to an isolated island and start a new population. , The Amish show this effect because they have not recruited newcomers and grew from a few members. , Bottleneck Effect: Population of seal decreases drastically due to overhunting., A forest fire destroys 90% of the plant life. , The American Bison was once hunted to such an extent that it became endangered. , Natural disasters can kill most of a population and leave behind a small random group of survivors. ,

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