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.

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利用这四种菌构建高效混合菌群，筛选出最优混合菌G8，对石油的去除率达到68.76%，比单菌株提高了近30%。

The optimal mixed strains G8 was selected and its oil removal ratio is 68.76%, nearly 30% higher than the single strains.

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