The type of geographic barriers that would have led to finches speciation on the Galapagos to differ could be, adapting to the diet.
Allopratic
Allopatric speciation occurs when two species are separated by geographic isolation. Isolation can occur due to great distance or a physical barrier, such as a desert, river or mountain. The finches observed by Darwin is an example of this speciation in which he observed that, in the Galapagos Islands, they differed by the type of beak. In addition, it would be a way of adapting to the diet of each of the 14 species.
With this information, we can conclude that the type of geographic barrier that would have led to the speciation of finches in the Galapagos could be adaptation to the diet.
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