95% of Central American freshwater fish are South American in origin, with only the Tropical gar (Atractosteus tropicus), three clupeids (Dorosoma), a catostomid (Ictiobus), and an ictalurid (Ictalurus) of North American origin.
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The montane vegetation of the region is distinct from the lowland vegetation, and includes species with origins in temperate North America, including oaks (Quercus), Pines (Pinus) and alders (Alnus), as well as a some species with origins in temperate South America, including Weinmannia and Drimys.
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