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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Predominance of heavily calcified coccolithophores at low CaCO_3 saturation during winter in the Bay of Biscay
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Predominance of heavily calcified coccolithophores at low CaCO_3 saturation during winter in the Bay of Biscay

机译：比斯开湾冬季低CaCO_3饱和度时严重钙化的球墨石藻优势

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摘要

Coccolithophores are an important component of the Earth system, and, as calcif iers, their possible susceptibility to ocean acidification is of major concern. Laboratory studies at enhanced pCO_2 levels have produced divergent results without overall consensus. However, it has been predicted from these studies that, although calcification may not be depressed in all species, acidification will produce "a transition in dominance from more to less heavily calcified coccolithophores" [Ridgwell A, et al., (2009) Biogeostiences 6:2611-2623]. A recent observational study [Beaufort L, et al., (2011) Nature 476:80-83] also suggested that coccolithophores are less calcified in more acidic conditions. We present the results of a large observational study of coccolithophore morphology in the Bay of Biscay. Samples were collected once a month for over a year, along a 1,000-km-long transect. Our data clearly show that there is a pronounced seasonality in the morphotypes of Emiliania huxleyi, the most abundant coccolithophore species. Whereas pH and CaCO_3 saturation are lowest in winter, the E. huxleyi population shifts from <10% (summer) to >90% (winter) of the heavily calcified form. However, it is unlikely that the shifts in carbonate chemistry alone caused the morphotype shift. Our finding that the most heavily calcified morphotype dominates when conditions are most acidic is contrary to the earlier predictions and raises further questions about the fate of coccolithophores in a high-CO_2 world.
机译：球墨镜是地球系统的重要组成部分，作为钙化石，它们对海洋酸化的可能敏感性是主要关注的问题。在提高的pCO_2水平下进行的实验室研究产生了分歧的结果，而没有总体共识。但是，从这些研究中可以预测，尽管并非所有物种都可以抑制钙化，但酸化会产生“从较多钙化的球墨石到较不钙化的球墨石的显性转变” [Ridgwell A，et al。，（2009）Biogeostiences 6 ：2611-2623]。最近的一项观察性研究[Beaufort L，et al。，（2011）Nature 476：80-83]也表明，在更酸性的条件下，球墨镜的钙化较少。我们提出了比斯开湾的球石藻形态的大型观察研究的结果。沿着一个1,000公里长的样带，每月采样一次，为期一年以上。我们的数据清楚地表明，Emiliania huxleyi（最丰富的球石属物种）的形态型具有明显的季节性。尽管冬季的pH和CaCO_3饱和度最低，但霍乱埃希氏菌种群从重钙化形式的<10％（夏季）转变为> 90％（冬季）。但是，仅碳酸盐化学变化不会引起形态变化。我们的发现，当条件最酸性时，最重的钙化形态型占主导地位，这与早先的预测相反，并且对高CO_2世界中的球墨镜的命运提出了进一步的疑问。

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    Helen E. K. Smith; Toby Tyrrell; Anastasia Charalampopoulou; Cynthia Dumousseaud; Oliver J. Legge; Sarah Birchenough; Laura R. Pettit; Rebecca Garley; Sue E. Hartman; Mark C. Hartman; Navjit Sagoo; Chris J. Daniels; Eric P. Achterberg; David J. Hydes;

  • 作者单位

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom,Ocean Biogeochemistry and Ecosystems Research Group, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom,School of Marine Science and Engineering, Plymouth University, Plymouth PL4 8AA, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom,Bermuda Institute of Ocean Sciences, St. George's GE 01, Bermuda;

    Ocean Biogeochemistry and Ecosystems Research Group, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean Biogeochemistry and Ecosystems Research Group, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom,School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom,Ocean Biogeochemistry and Ecosystems Research Group, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean and Earth Science, University of Southampton, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

    Ocean Biogeochemistry and Ecosystems Research Group, National Oceanography Centre Southampton, Southampton SO14 3ZH, United Kingdom;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    phytoplankton; north atlantic; climate change;

    机译：浮游植物北大西洋气候变化;

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