Across geographic gradients, Levins expects allopatric races or coenospecies exist.
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.
Levins chooses another approximation to solve the problem of the combined effects of migration and seletion.
莱温斯采用了另一种近似法来解决迁移和选择的联合效应问题.
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