强紫外辐射会对水生生物产生不利的影响，水生生物为了应对紫外辐射会产生不同的适应性。以往研究认为浮游甲壳动物通过昼夜垂直迁移或积累抗紫外物质来适应水下紫外辐射，而抗紫外物质积累的适应机制多是从室内实验获得的，是否在野外存在尚不清楚。我们前期调查发现有抗紫外物质的浮游甲壳动物依然存在昼夜垂直迁移行为，因此，本研究假设在水下紫外辐射较强的湖泊中，浮游甲壳动物抗紫外物质的积累可能不足以抵御表层水下紫外辐射，而必须依赖昼夜垂直迁移适应水下紫外辐射。本项目选择云南高山湖泊作为研究地点，采用野外调查和模拟实验相结合的方法，在调查浮游甲壳动物昼夜垂直迁移规律的基础上，分析其与环境因子及抗紫外物质的关系，通过模拟实验分析紫外辐射对含有抗紫外物质的浮游甲壳动物的影响程度。本研究的目的是揭示浮游甲壳动物对紫外辐射的适应机制，结果有助于认识全球变化造成的紫外辐射增强对浮游甲壳动物的影响。

Strong ultraviolet (UV) radiation can make a negative impact on aquatic organisms, and aquatic organisms will produce different adaptive performance to ultraviolet radiation. Previous studies demonstrated that crustacean zooplankton can adapt to underwater ultraviolet radiation through diel vertical migration (DVM) or accumulation of UV protective compounds. The latter mechanism was often reflected in the process of the lab experiment, and it is still unclear whether this mechanism exit in the natural lakes. Our preliminary investigation showed that crustacean zooplankton containing UV protective compounds still have DVM behavior. Thus, we make a hypothesis that the crustacean zooplankton containing UV protective compounds may not be enough to prevent the damage from ultraviolet radiation of surface layer in lakes with higher ultraviolet radiation, and have to rely on DVM to adapt to UV radiation of surface layer. We select the alpine lakes in Yunnan as the study site and combine the methods of field investigation and simulation experiments. Based on the investigation of DVM behavior of crustacean zooplankton, we will analyze its relationship with environmental factors and the UV protective compounds. We also judge the impact of UV radiation on crustacean zooplankton containing the UV protective compounds through the simulation experiments. Our aim will reveal the adaptation mechanisms of crustacean zooplankton to UV radiation. The obtained results will lead to better understanding of the effect of the global increase in UV radiation on crustacean zooplankton.