The American Entomological Society
The arctic fauna has tactily been considered as a collection of offshoots arising from elements of the boreal deciduous forest, its neighboring biome to the south. Two circumstances make this conjecture plausible. First, the Arctic has a relatively small fauna compared to biomes south of it, and second, the animal species found in the Arctic usually show phylogenetic affinities to groups found in more southern regions. In order to test the validity of the boreal-to-arctic evolutionary pathway, it is necessary to discover circumstances in which the arctic species are derived entities that evolved from more ancestral southern relatives.
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