Species-specific calcite production reveals Coccolithus pelagicus as the key calcifier in the Arctic Ocean
Species-specific calcite production reveals Coccolithus pelagicus as the key calcifier in the Arctic Ocean
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DOI：
10.3354/meps11820
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发表时间：
2016-08-18
影响因子：
2.5
通讯作者：
Tyrrell, Toby
中科院分区：
文献类型：
--
作者：
Daniels, Chris J.;Poulton, Alex J.;Tyrrell, Toby
通过生产和输出方解石球砾石，球砾石形成了全球碳循环的关键组成部分。尽管这一关键作用，但人们对不同颗石藻物种在方解石生产方面的生物地球化学作用知之甚少，也不知道这些物种将如何应对未来的气候变化和海洋酸化。在此，我们首次对2012年6月在北冰洋和亚北极冰岛盆地收集的样品进行了研究，以估计特定物种的方解石产量。研究结果表明，尽管球石藻只占总群落丰度的一小部分（2%），但我们的估计表明，它是北冰洋和冰岛盆地主要的方解石生产者（占总方解石产量的57%）。相比之下，赫胥黎Emiliania huxleyi占总丰度的27%，仅占方解石产量的20%。在方解石产量上占优势的原因是其细胞方解石含量相对较高。我们的研究结果首次表明，在考虑上层方解石生产时，研究完整的球石藻群落的重要性，因为相对罕见但严重钙化的物种，如pelagicus，可能是混合群落中关键的方解石生产者。因此，对海洋酸化和气候变化的响应有可能对北大西洋和北冰洋的碳循环产生重大影响。
Through the production and export of their calcite coccoliths, coccolithophores form a key component of the global carbon cycle. Despite this key role, very little is known about the biogeochemical role of different coccolithophore species in terms of calcite production, and how these species will respond to future climate change and ocean acidification. Here, we present the first study to estimate species-specific calcite production, from samples collected in the Arctic Ocean and subarctic Iceland Basin in June 2012. We show that although the coccolithophorid Coccolithus pelagicus comprised only a small fraction of the total community in terms of abundance (2%), our estimates indicate that it was the major calcite producer in the Arctic Ocean and Iceland Basin (57% of total calcite production). In contrast, Emiliania huxleyi formed 27% of the total abundance and was responsible for only 20% of the calcite production. That C. pelagicus was able to dominate calcite production was due to its relatively high cellular calcite content compared with the other species present. Our results demonstrate, for the first time, the importance of investigating the complete coccolithophore community when considering pelagic calcite production, as relatively rare but heavily calcified species such as C. pelagicus can be the key calcite producers in mixed communities. Therefore, the response of C. pelagicus to ocean acidification and climate change has the potential to have a major impact on carbon cycling within the North Atlantic and Arctic Ocean.