Image Caption
After some generations, the island flies become reproductively isolated from the mainland flies. Peripatric speciation has occurred.
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This image is part of a series:
![](https://evolution.berkeley.edu/wp-content/uploads/2021/10/15171_evo_resources_resource_image_305_original.gif)
Peripatric speciation (1 of 5)
Only a few fruit fly larvae survived the journey from the mainland to colonize the island.![](https://evolution.berkeley.edu/wp-content/uploads/2021/10/58178_evo_resources_resource_image_306_original.gif)
Peripatric speciation (2 of 5)
These few survivors just by chance carry some genes that are rare in the mainland population. One of these rare genes happens to cause a slight variation in the mating…![](https://evolution.berkeley.edu/wp-content/uploads/2021/10/67937_evo_resources_resource_image_307_original.gif)
Peripatric speciation (3 of 5)
These small differences, which are rare on the mainland, drift to fixation in the small population on the island over the course of a few generations (i.e., the entire island…![](https://evolution.berkeley.edu/wp-content/uploads/2021/10/6819_evo_resources_resource_image_308_original.gif)