Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea
Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea
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南海北部的浮游植物比细菌和病毒更能耐受紫外线
DOI：
10.3354/ame01540
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发表时间：
2011-12
影响因子：
1.4
通讯作者：
Zhang, Jiangtao
中科院分区：
文献类型：
--
作者：
Yuan, Xiangcheng;Harrison, Paul J.;Yin, Kedong;Zhang, Jiangtao
2005年夏末，沿着盐度梯度研究了紫外辐射（UVR）对南海北方初级生产力（PP）、细菌生产力（BP）和病毒衰减率（VDR）的影响。淡水输入使珠江口附近的UVA漫射衰减系数增大（最高可达2.7m1），从而影响了对紫外线的抑制效果，VDR与UVA漫射衰减系数显著相关。上涌沃茨中UVR对PP的抑制作用显著高于下涌沃茨，表明垂直混合（即上升流和下降流）是调节微生物对UVR敏感性的重要因素。UVR抑制PP和BP的~15和25%，分别，和UVR抑制BP是显着高于PP在大多数样品中，因此有一个相对较高的UVR暴露下的浮游植物比细菌的竞争优势。UVR使VDR增加约30%，使细菌死亡率降低0.12 - 0.3%h-1，减轻了UVR对细菌的抑制作用。总体而言，南海亚热带北方浮游植物对UVR的耐受性强于细菌和病毒。
In late summer of 2005, the effects of ultraviolet radiation (UVR) on primary produc- tion (PP), bacterial production (BP) and viral decay rates (VDR) were investigated along a salinity gradient in the northern South China Sea. The freshwater input increased the UVA diffuse atten- uation coefficient (up to 2.7 m �1 ) near the Pearl River estuary and consequently influenced the UVR inhibitory effects, as VDR was significantly correlated with the UVA diffuse attenuation coef- ficient. UVR inhibition of PP was significantly higher in upwelled waters than downwelled waters, suggesting that the vertical mixing (i.e. upwelling and downwelling) was an important factor reg- ulating microbial sensitivity to UVR. UVR inhibited PP and BP by ~15 and 25%, respectively, and the UVR inhibition of BP was significantly higher than that of PP in most of the samples; hence there was a competitive advantage for phytoplankton over bacteria under the relatively high UVR exposure. UVR increased VDR by ~30%, which decreased bacterial mortality by 0.12 to 0.3% h �1 and mitigated the inhibitory effects of UVR on bacteria. In general, phytoplankton were more tolerant than bacteria and viruses to UVR in the sub-tropical northern South China Sea.
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