How same species of fresh water fish can be found on different continents?
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There are two main ways.
Vicariance – originally the species lives across a MUCH larger range of area, but as climactic and geologic events occur, the group gets slowly split up and isolated by each other.
Dispersal – fish either manually or artificially “colonize” different basins until they are completely disconnected from their source. Alternatively, humans disperse them by hand.
Over a long enough period of time, this can allow for the same species of fish to show up in completely different parts of the world.
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