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首页> 外文期刊>Marine ecology progress series >Ocean acidification impacts on biomass and fatty acid composition of a post-bloom marine plankton community
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Ocean acidification impacts on biomass and fatty acid composition of a post-bloom marine plankton community

机译：海洋酸化对生物质和脂肪酸组成的盛开海洋浮游生物群落的影响

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A mesocosm approach was used to investigate the effects of ocean acidification (OA) on a natural plankton community in coastal waters off Norway by manipulating CO2 partial pressure (pCO(2)). Eight enclosures were deployed in the Raunefjord near Bergen. Treatment levels were ambient (similar to 320 mu atm) and elevated pCO(2) (similar to 2000 mu atm), each in 4 replicate enclosures. The experiment lasted for 53 d in May-June 2015. To assess impacts of OA on the plankton community, phytoplankton and protozooplankton biomass and total seston fatty acid content were analyzed. In both treatments, the plankton community was dominated by the dinoflagellate Ceratium longipes. In the elevated pCO(2) treatment, however, biomass of this species as well as that of other dinoflagellates was strongly negatively affected. At the end of the experiment, total dinoflagellate biomass was 4-fold higher in the control group than under elevated pCO(2) conditions. In a size comparison of C. longipes, cell size in the high pCO(2) treatment was significantly larger. The ratio of polyunsaturated fatty acids to saturated fatty acids of seston decreased at high pCO(2). In particular, the concentration of docosahexaenoic acid (C 22:6n3c), essential for development and reproduction of metazoans, was less than half at high pCO(2) compared to ambient pCO(2). Thus, elevated pCO(2) led to a deterioration in the quality and quantity of food in a natural plankton community, with potential consequences for the transfer of matter and energy to higher trophic levels
机译：通过操纵二氧化碳部分压力（PCO（2）），使用Mesocosm方法来研究海洋酸化（OA）在挪威沿海水域的天然浮游生物群落的影响。在卑尔根附近的Raunefjord部署了八个围栏。治疗水平是环境（类似于320μmatm）和升高的PCO（2）（类似于2000μmatm），每个都在4个复制外壳中。 2015年5月至6月的实验持续了53天。为评估OA对浮游生物群落的影响，分析了浮游植物和Protozooplankton生物量和全部半脂肪酸含量。在这两种治疗中，浮游生物群落由Dinoflagellate Ceratium Longipes主导。然而，在升高的PCO（2）治疗中，这种物种的生物量以及其他Dinoflagellates的生物量受到强烈的影响。在实验结束时，对照组的总Dinoflagelate生物质比在升高的PCO（2）条件下更高4倍。在C. Longipes的尺寸比较中，高PCO（2）处理中的细胞尺寸显着较大。在高PCO（2）下，多不饱和脂肪酸与饱和脂肪酸的比例降低。特别地，与环境PCO（2）相比，多己烯酸（C 22：6N3C）的浓度，对于美人酶的开发和繁殖，低于高PCO（2）的一半。因此，升高的PCO（2）导致了天然浮游生物群落中食物的质量和数量的恶化，其对物质和能量转移到更高的营养水平的潜在后果

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