Data from: Effects of UVB radiation on grazing of two cladocerans from high-altitude Andean lakes

Climate change and water extraction may result in increased exposition of the biota to ultraviolet-B radiation (UVB) in high-altitude Andean lakes. Although exposition to lethal doses in these lakes is unlikely, sub-lethal UVB doses may have strong impacts in key compartments such as zooplankton. Here, we aimed at determining the effect of sub-lethal UVB doses on filtration rates of two cladoceran species (Daphnia pulicaria and Ceriodaphnia dubia). We firstly estimated the Incipient Limiting Concentration (ILC) and the Gut Passage Time (GPT) for both species. Thereafter we exposed clones of each species to four increasing UVB doses (treatments): i) DUV-0 (Control), ii) DUV-1 (0.02 MJ m2), iii) DUV-2 (0.03 MJ m2) and iv) DUV-3 (0.15 MJ m2); and estimated their filtration rates using fluorescent micro-spheres. Our results suggest that increasing sub-lethal doses of UVB radiation may strongly disturb the structure and functioning of high-altitude Andean lakes. Filtration rates of D. pulicaria were not affected by the lowest dose applied (DUV-1), but decreased by 50% in treatments DUV-2 and DUV-3. Filtration rates for C. dubia were reduced by more than 80% in treatments DUV-1 and DUV-2 and 100 % of mortality occurred at the highest UVB dose applied (DUV-3).

气候变化与水资源抽取可能导致安第斯高原湖泊中的生物群落暴露于更强的紫外-B辐射（ultraviolet-B radiation，UVB）。尽管这些湖泊中生物暴露于致死剂量UVB的概率较低，但亚致死剂量的UVB可能对浮游动物等关键功能组分产生显著影响。本研究旨在探究亚致死UVB剂量对两种枝角类物种（盔形溞*Daphnia pulicaria*和角突网纹溞*Ceriodaphnia dubia*）滤食率的影响。我们首先估算了这两个物种的初始限制浓度（Incipient Limiting Concentration，ILC）与肠道通过时间（Gut Passage Time，GPT）。随后将每个物种的克隆株分别暴露于4个梯度递增的UVB剂量处理组：i) DUV-0（对照组）、ii) DUV-1（0.02 MJ·m⁻²）、iii) DUV-2（0.03 MJ·m⁻²）以及iv) DUV-3（0.15 MJ·m⁻²），并通过荧光微球法测定其滤食率。研究结果表明，不断升高的亚致死UVB辐射剂量可能严重干扰安第斯高原湖泊的生态结构与功能。盔形溞的滤食率未受最低剂量处理（DUV-1）的影响，但在DUV-2与DUV-3处理组中下降了50%。角突网纹溞的滤食率在DUV-1和DUV-2处理组中降低了80%以上，且在最高UVB剂量处理（DUV-3）下全部个体死亡。