UV‐enhanced fish predation and the differential migration of zooplankton to UV radiation and fish
UV‐enhanced fish predation and the differential migration of zooplankton to UV radiation and fish
复制标题
紫外线增强的鱼类捕食以及浮游动物对紫外线辐射和鱼类的差异迁移
DOI：
10.4319/lo.2009.54.4.1152
复制
发表时间：
2009
影响因子：
4.5
通讯作者：
Lisette E. Torres
中科院分区：
文献类型：
--
作者：
D. Leech;Wiebke J. Boeing;Sandra L. Cooke;C. Williamson;Lisette E. Torres
众所周知，可见光的强度和光谱组成会影响鱼类对浮游动物的捕食。然而，在清水系统中，紫外线（UV）辐射（UVR）也可能影响鱼类的捕食，直接通过紫外线增强的觅食，间接通过捕食者-猎物重叠的改变，或两者的结合。在这里，我们验证了UVR促进鱼类捕食寡营养湖泊浮游动物的假设。实验在2.2米长的紫外透明或紫外阻挡柱中悬浮。比较了在有和没有紫外线照射的情况下，年生大口黑鲈（Micropterus salmoides）的浮游动物食用量，并量化了不同光照和鱼类处理下猎物的垂直分布。此外，还进行了一项单独的实验，以检查浮游动物对紫外线照射和鱼类激素的垂直反应。总体而言，在有紫外线照射的情况下，浮游动物的YOY捕食率高于没有紫外线照射的情况，特别是在双足桡足类动物上。这一结果只能部分解释浮游动物的迁徙行为，这表明紫外线增强了YOY鲈鱼的搜索能力。此外，双足鱼对鱼类激素的垂直行为反应强于紫外线，而水蚤对紫外线的垂直行为反应强于紫外线。
The intensity and spectral composition of visible light are known to influence fish predation on zooplankton. However, in clear‐water systems, ultraviolet (UV) radiation (UVR) may also influence fish predation, directly through UV‐enhanced foraging, indirectly through alterations in predator‐prey overlap, or in a combination of the two. Here we test the hypothesis that UVR facilitates fish predation on zooplankton in an oligotrophic lake. Experiments were conducted in 2.2‐m‐long UV‐transparent or UV‐blocking columns suspended in the epilimnion. Zooplankton consumption by young‐of‐the‐year (YOY) largemouth bass (Micropterus salmoides) was compared in the presence and absence of UVR, and the vertical distributions of prey were quantified across light and fish treatments. In addition, a separate experiment was conducted to examine zooplankton vertical responses to UV exposure vs. fish kairomones. Overall, YOY predation on zooplankton was higher in the presence than in the absence of UVR, particularly on diaptomid copepods. This result was only partially explained by zooplankton migratory behaviors, suggesting UV‐enhanced searching capabilities in YOY bass. Furthermore, diaptomids displayed a stronger vertical behavioral response to fish kairomones than to UVR whereas Daphnia exhibited a stronger response to UVR.