Arctic microbial community dynamics influenced by elevated CO2 levels
Arctic microbial community dynamics influenced by elevated CO2 levels
复制标题
DOI：
10.5194/bg-10-719-2013
复制
发表时间：
2013-01-01
期刊：
影响因子：
4.9
通讯作者：
Riebesell, U.
中科院分区：
文献类型：
--
作者：
Brussaard, C. P. D.;Noordeloos, A. A. M.;Riebesell, U.
北冰洋生态系统特别容易受到海洋酸化（OA）相关的变化，由于相对较高的CO2溶解度和低碳酸盐饱和状态的冷表面沃茨。然而，到目前为止，关于OA对食物网基础的影响知之甚少。在一个中型生态系统的CO2富集实验（整体CO2水平范围从类似的180至1100亩大气压）在Kongsfjorden关闭斯瓦尔巴群岛，我们研究了OA对自然浮游微生物群落的后果。OA明显影响了北极浮游植物群落的组成和生长，即picoeukaryotic光合自养生物和在较小程度上的nanophytoplankton蓬勃发展。由于有机酸的影响，浮游植物向最小的浮游植物转移，将对远洋食物网的结构和功能产生直接影响，从而对海洋地球化学循环产生直接影响。除了被放牧，占主导地位的皮科和微型浮游植物群体被发现容易病毒裂解，从而分流到溶解的有机碳池中的生物有机体的碳积累，并随后影响这些北极沃茨的生物泵的效率。
The Arctic Ocean ecosystem is particularly vulnerable to ocean acidification (OA) related alterations due to the relatively high CO2 solubility and low carbonate saturation states of its cold surface waters. Thus far, however, there is only little known about the consequences of OA on the base of the food web. In a mesocosm CO2-enrichment experiment (overall CO2 levels ranged from similar to 180 to 1100 mu atm) in Kongsfjorden off Svalbard, we studied the consequences of OA on a natural pelagic microbial community. OA distinctly affected the composition and growth of the Arctic phytoplankton community, i.e. the picoeukaryotic photoautotrophs and to a lesser extent the nanophytoplankton thrived. A shift towards the smallest phytoplankton as a result of OA will have direct consequences for the structure and functioning of the pelagic food web and thus for the biogeochemical cycles. Besides being grazed, the dominant pico- and nanophytoplankton groups were found prone to viral lysis, thereby shunting the carbon accumulation in living organisms into the dissolved pools of organic carbon and subsequently affecting the efficiency of the biological pump in these Arctic waters.