Cramp Rebecca L, Reid Stefanie, Seebacher Frank, Franklin Craig E
School of Biological Sciences, University of Queensland, Brisbane, Queensland 4072, Australia.
School of Biological Sciences, University of Sydney, Sydney, New South Wales 2006, Australia.
Biol Lett. 2014 Sep;10(9). doi: 10.1098/rsbl.2014.0449.
Levels of UVB radiation (UVB) and mean temperatures have increased substantially over recent decades in many regions of the world. Both stressors independently can compromise immune function, disease resistance and fitness in fish. The impact of UVB can also be exacerbated by interactions with environmental temperatures. In this paper, we test the hypothesis that UVB and temperature act synergistically to influence patterns of energy consumption and susceptibility to disease. We exposed mosquitofish, Gambusia holbrooki, to a factorial design of low and high UVB levels and low (18°C) and high (25°C) temperatures. The combination of high UVB and high temperature interacted synergistically to suppress metabolism and exacerbate infection intensity by the fish pathogen whitespot (Ichtyhophthirius multifiliis). Given the rapid changes in the thermal environment globally, the interaction between UVB and temperatures on energy use and disease resistance could pose significant problems for aquatic animal health in the context of both pre-existing and emerging diseases.
近几十年来，世界许多地区的紫外线B辐射（UVB）水平和平均温度都大幅上升。这两种应激源各自都可能损害鱼类的免疫功能、抗病能力和健康状况。UVB的影响还可能因与环境温度的相互作用而加剧。在本文中，我们检验了这样一个假设：UVB和温度协同作用，影响能量消耗模式和疾病易感性。我们将食蚊鱼（Gambusia holbrooki）暴露于低UVB水平和高UVB水平以及低（18°C）和高（25°C）温度的析因设计中。高UVB和高温的组合协同作用，抑制了新陈代谢，并加剧了鱼类病原体白点病（Ichtyhophthirius multifiliis）的感染强度。鉴于全球热环境的迅速变化，UVB和温度在能量利用和抗病能力方面的相互作用，在既有疾病和新出现疾病的背景下，可能给水生动物健康带来重大问题。
