Strong responses of Southern Ocean phytoplankton communities to volcanic ash
Strong responses of Southern Ocean phytoplankton communities to volcanic ash
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DOI：
10.1002/2014gl059364
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发表时间：
2014-04-28
影响因子：
5.2
通讯作者：
Moore, C. M.
中科院分区：
文献类型：
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作者：
Browning, T. J.;Bouman, H. A.;Moore, C. M.
火山喷发被假设为浮游植物大量繁殖的铁供应机制；然而，在该领域几乎没有获得刺激反应的直接证据。本文介绍了在南大西洋和南大洋进行的21个为期1-2天的瓶子富集实验的结果，这些实验最终证明了玄武岩或流纹岩火山灰供应后浮游植物群落的光生理和生物量刺激。此外，在南大洋的实验表明，浮游植物群落对火山灰供应有显著的响应，而没有对单独添加溶解铁的响应。在这些地点，海水中溶解的锰浓度是有史以来最低的，因此我们认为对灰烬的反应增强可能是锰（co）限制解除的结果。我们的研究结果表明，火山灰沉积事件可能引发广泛的浮游植物繁殖，可能对区域碳循环产生重大影响。对浮游植物进行了瓶级铁和火山灰添加实验，结果表明，浮游植物对火山灰的响应大于对铁的响应，表明火山灰缓解了浮游植物对锰的限制
Volcanic eruptions have been hypothesized as an iron supply mechanism for phytoplankton blooms; however, little direct evidence of stimulatory responses has been obtained in the field. Here we present the results of twenty-one 1-2day bottle enrichment experiments from cruises in the South Atlantic and Southern Ocean which conclusively demonstrated a photophysiological and biomass stimulation of phytoplankton communities following supply of basaltic or rhyolitic volcanic ash. Furthermore, experiments in the Southern Ocean demonstrated significant phytoplankton community responses to volcanic ash supply in the absence of responses to addition of dissolved iron alone. At these sites, dissolved manganese concentrations were among the lowest ever measured in seawater, and we therefore suggest that the enhanced response to ash may have been a result of the relief of manganese (co)limitation. Our results imply that volcanic ash deposition events could trigger extensive phytoplankton blooms, potentially capable of significant impacts on regional carbon cycling.Key Points Bottle-scale iron and volcanic ash addition experiments were conducted Phytoplankton responded more to the ash than iron in a number of experiments The ash is suggested to have relieved phytoplankton manganese (co)limitation