Copepod density showed an obvious gradient with the distance from the reservoir dam: the nearer to the dam, the denser the copepods.

• 桡足类种类组成、空间分布和密度具有明显的季节变化特征, 此外密度在水库的纵轴上也表现出明显的梯度分布, 越近大坝密度越高。