Collaborative Research: Ultraviolet Radiation Induced DNA Damage in Bacterioplankton in the Southern Ocean

9801785米切尔：现在有强有力的证据表明，由于臭氧消耗，南极洲和南大洋某些地区的紫外线辐射正在增加。臭氧浓度的降低选择性地限制了平流层对紫外线辐射的吸收，并导致到达地球表面的紫外线辐照度增加。关于臭氧消耗造成的紫外线辐射增加的影响的研究主要集中在浮游植物上，而针对其他营养级的研究则少得多。这个合作项目将解决紫外线辐射引起的损害和紫外线辐射对浮游细菌的影响。研究将审查浮游细菌与光化学过程之间的相互作用以及与浮游植物和浮游动物等高等营养群体之间的相互作用。要解决的问题将包括细菌浮游植物耦合是否改变细菌对紫外线辐射的反应，紫外线辐射的季节性变化如何影响细菌群落动态以及化学光产物如何影响细菌生产。本研究项目将阐明负责生产力变化的分子决定因素以及对不断变化的紫外线辐射的分子和生理反应。总体目标是更好地了解紫外线辐射变化对海洋微生物群落的潜在影响。

9801785 MITCHELL There is now strong evidence that ultraviolet (UV) radiation is increasing over certain locations in Antarctica and the Southern Ocean as a result of ozone depletion. A reduction in ozone concentration selectively limits stratospheric adsorption of UV radiation and results in a higher UV irradiance reaching the earth's surface. Research on the impact of increased UV radiation due to ozone depletion has focused primarily on phytoplankton, with a much smaller effort being directed to other trophic levels. This collaborative project will address UV radiation induced damage and UV radiation effects on bacterioplankton. Studies will examine interactions between bacterioplankton and photochemical processes and interactions with higher trophic groups such as phytoplankton and zooplankton. Topics to be addressed will include whether bacterial-phytoplankton coupling modifies bacterial response to UV radiation, how seasonal changes in UV radiation affect bacterial community dynamics and how chemical photoproducts impact bacterial production.. This research project will elucidate the molecular determinants responsible for changes in productivity and the molecular and physiological responses to changing UV radiation. The overall goal is to provide a greater understanding of the potential impact that changes in UV radiation have on marine microbial communities.