穿过地理梯度，莱文斯预料有分布区不重叠的小种或近群种。
Across geographic gradients, Levins expects allopatric RACES or coenospecies exist.
异域种的分布在不同地区的，分布区不重叠的，常指由于地理分隔而不能杂交的相关生物的族群。
Occurring in separate, nonoverlapping geographic areas. Often used of populations of related organisms unable to crossbreed because of geographic separation.
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