文章摘要
海洋酸化对颗石藻生理特性的影响
Effects of Ocean Acidification on Physiological Characteristics of Coccolithophores
投稿时间:2019-03-19  修订日期:2019-04-11
DOI:
中文关键词: 海洋酸化  颗石藻  特异性  生物多样性
英文关键词: Ocean acidification  Coccolithophores  specific  Biodiversity
基金项目:国家重点研发计划“蓝色粮仓科技创新”重点专项(2018YFD0900703;2018YFD0901503-8);中国水产科学研究院黄海水产研究所基本科研业务费(20603022019006);青岛海洋科学与技术试点国家实验室海洋渔业科学与食物产出过程功能实验室渔业科技青年人才计划项目(2018-MFS-T01)
作者单位E-mail
黄书杰 中国水产科学研究院黄海水产研究所 huangshujie1221@163.com 
徐东 中国水产科学研究院黄海水产研究所  
王东升 中国水产科学研究院黄海水产研究所  
张现盛 中国水产科学研究院黄海水产研究所  
叶乃好 中国水产科学研究院黄海水产研究所 yenh@ysfri.ac.cn 
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中文摘要:
      二氧化碳升高引起的海洋酸化对海洋生物尤其是钙化生物颗石藻产生了很大的影响。然而,有关颗石藻对二氧化碳升高响应的研究大多集中在单一的品系上,并且在种内或者种间产生了差异甚至相互矛盾的结果。本研究中,分别以Emiliania huxleyi (E. huxleyi) 和Gephyrocapsa oceanica (G. oceanica) 两种颗石藻的钙化和非钙化的四个品系藻种为研究对象,设置了400 μatm、750 μatm、1000 μatm、2000 μatm四个二氧化碳浓度梯度同时进行分批充气培养,系统研究了海洋酸化对颗石藻的生长光合、氮源吸收、元素组成和钙化效率等生理影响。结果显示,随着CO2浓度升高至2000 μatm,不同的颗石藻并未有统一的反应。除了非钙化的赫氏颗石藻 (Emiliania huxleyi, N-E)之外,其他三个品系颗石藻的生长和颗粒有机碳产率都对二氧化碳增加表现出积极的响应;随着二氧化碳浓度的升高,四种品系颗石藻的光合参数Fv/Fm、Y(II)和叶绿素含量呈整体下降趋势;C-E和C-G在第七天的钙化效率分别下降了35.4%和68.9%;此外,四种品系颗石藻的颗粒有机氮产率都出现增加趋势,而POC/PON和PIC/POC均呈现下降趋势。我们确定了海洋酸化对颗石藻的不同生理影响,这种差异影响可能会导致未来海洋生物多样性的改变和其他生态系统进程的变化。
英文摘要:
      Ocean acidification caused by increasing carbon dioxide has a great impact on marine organisms, especially calcified coccolithophores. However, culture experiments examining the response of coccolithophores to elevated CO2 pahave mostly been based on investigations of a single strain and have yielded differences and even contradictory results from different experiments between and even within species. Here, four strains of the coccolithophores, which contained separately naked and calcifying strains, were investigated simultaneously as the research objects for the first time. Four carbon dioxide concentration gradients (400 μatm, 750 μatm, 1000 μatm and 2000μatm) were set up to systematically study the effects of ocean acidification on growth, photosynthesis, nitrogen source absorption, element composition and calcification efficiency of four coccolithopsis species by batch aeration culture. The results did not show a uniform response from different strains to elevated CO2 concentrations up to 2000 μatm, and the naked strain Emiliania huxleyi (N-E) was seriously suppressed, in sharp contrast to the positive response of the different levels of the other three algae. On the other hand, photosynthetic parameters Fv/Fm, Y(II) and pigment from four strains show overall downward trend, and calcification efficiency of C-E and C-G decrease respectively 35.4% and 68.9% on the seventh day. In addition, four coccolithophore strains of particulate organic nitrogen production show an increasing trend and the resulting POC: PON and PIC: POC are declining. We determined that the responses of coccolithophores to ocean acidification are specific, and this variation may cause changes to biodiversity and other ecosystem processes in the future ocean.
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