Potential effects of UV-B on the chemical environment of marine organisms: a review.
Potential effects of UV-B on the chemical environment of marine organisms: a review.
复制标题
UV-B 对海洋生物化学环境的潜在影响：综述。
DOI：
10.1016/0269-7491(91)90084-a
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发表时间：
1991
影响因子：
8.9
通讯作者：
F. M. Morel
中科院分区：
文献类型：
--
作者：
B. Palenik;N. M. Price;F. M. Morel
由于平流层臭氧耗竭而增加的紫外线b （UV-B）可能通过改变其环境的化学成分而影响海洋浮游植物的生长。UV-B通量的增加可能会改变生物活性自由基的产生、有机物的光分解和微量金属的可利用性。这种化学环境的变化对海洋浮游植物可能是有害的，也可能是有益的。细胞外自由基如OH、Br2−和CO3−的影响可以忽略不计，但超氧化物及其分解产物过氧化氢可能与细胞表面迅速反应，破坏膜的功能和完整性。增加UV-B会提高氧化还原活性微量金属铁和铜的生物利用度。因此，在铁有限的高纬度海洋中，铁有效性的增加可能促进浮游植物的生产，而在海洋的其他部分，铜有效性的增加可能是有毒的。总的来说，UV-B对浮游植物的直接和间接相互依存的影响可能相互补偿，并解释了海洋生态系统能够承受广泛变化的UV-B通量而不受明显损害的能力。
An increase in ultraviolet-B (UV-B) due to depletion of stratospheric ozone may affect growth of marine phytoplankton by altering the chemistry of their environment. Production of bioactive free radicals, photodecomposition of organic matter, and availability of trace metals are likely to be altered by increased UV-B flux. Such changes to the chemical environment may be both deleterious and beneficial to marine phytoplankton. Extracellular free radicals such as OH, Br2−, and CO3−are predicted to have a negligible impact, but superoxide and its decomposition product hydrogen peroxide may react rapidly with cell surfaces and destroy membrane function and integrity. Increased UV-B will enhance the bioavailability of the redox active trace metals Fe and Cu. Thus, in the Fe-limited high latitude ocean, increased Fe availability may promote phytoplankton production, while in other parts of the ocean increased Cu availability may be toxic. Overall, the interdependent direct and indirect effects of UV-B on phytoplankton may compensate for each other and account for the ability of marine ecosystems to be subjected to widely variable UV-B flux without apparent damage.