Phytoplankton responses to dust addition in the Fe-Mn co-limited eastern Pacific sub-Antarctic differ by source region.
Phytoplankton responses to dust addition in the Fe-Mn co-limited eastern Pacific sub-Antarctic differ by source region.
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FE-MN共限制的东太平洋亚抗污染物中对粉尘添加的浮游植物反应因源区域而异。
DOI：
10.1073/pnas.2220111120
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发表时间：
2023-07-11
影响因子：
11.1
通讯作者：
Moore, C. Mark
中科院分区：
文献类型：
--
作者：
Wyatt, Neil J.;Birchill, Antony;Ussher, Simon;Milne, Angela;Bouman, Heather A.;Troein, Elizabeth Shoenfelt;Pabortsava, Katsiaryna;Wright, Alan;Flanagan, Oliver;Bibby, Thomas S.;Martin, Adrian;Moore, C. Mark
向南大洋提供微量营养素的大气尘埃是浮游植物生产力的重要调节器，影响着全球碳循环。了解浮游植物如何对粉尘供应的变化做出反应变得越来越重要，预计供应将随着未来气候变化而变化。我们发现，巴塔哥尼亚灰尘，这是不同的来源地区的特点，可以提供不同量的必需微量营养素铁和锰的南大洋，随后驱动不同的响应居民浮游植物。因此，沙尘供应的变化，包括源区的变化，可能是控制过去和未来南大洋浮游植物生产力的一个重要因素。光照和微量营养素的季节性供应强烈地调节着南大洋的生产力，限制了大量营养素的生物利用和二氧化碳的减少。矿物粉尘通量是微量营养素向南大洋输送的关键渠道，也是大气CO2多年尺度振荡的关键介质。虽然尘埃携带的铁（Fe）在南大洋海洋地球化学中的作用已被详细研究，但锰（Mn）的可用性也正在成为过去，现在和未来南大洋海洋地球化学的潜在驱动力。在这里，我们提出的结果，从15个生物测定实验沿着南北样带在采样不足的东太平洋亚南极区。除了广泛的铁限制浮游植物的光化学效率，我们发现进一步的反应，除了锰在我们的偏南的站，支持铁锰共同限制在南大洋的重要性。此外，除了不同的巴塔哥尼亚灰尘导致在增强的光化学效率与源区域灰尘的相对Fe/Mn溶解度的特性方面的差异响应。尘埃沉积的相对大小的变化，结合源区矿物学，因此可以确定铁或锰的限制是否控制南大洋生产力在未来以及过去的气候状态。
Atmospheric dust supply of micronutrients to the Southern Ocean is an important regulator of phytoplankton productivity, impacting the global carbon cycle. Understanding how phytoplankton respond to changes in dust supply has become increasingly important, with supply predicted to alter with future climate change. We show that Patagonian dusts, which differ in characteristics by source region, can supply different amounts of the essential micronutrients iron and manganese to the Southern Ocean and subsequently drive different responses in the resident phytoplankton. Changes in dust supply, including shifts in source regions, could therefore be an important factor controlling phytoplankton productivity in the past and future Southern Ocean. The seasonal availability of light and micronutrients strongly regulates productivity in the Southern Ocean, restricting biological utilization of macronutrients and CO2 drawdown. Mineral dust flux is a key conduit for micronutrients to the Southern Ocean and a critical mediator of multimillennial-scale atmospheric CO2 oscillations. While the role of dust-borne iron (Fe) in Southern Ocean biogeochemistry has been examined in detail, manganese (Mn) availability is also emerging as a potential driver of past, present, and future Southern Ocean biogeochemistry. Here, we present results from fifteen bioassay experiments along a north–south transect in the undersampled eastern Pacific sub-Antarctic zone. In addition to widespread Fe limitation of phytoplankton photochemical efficiency, we found further responses following the addition of Mn at our southerly stations, supporting the importance of Fe–Mn co-limitation in the Southern Ocean. Moreover, addition of different Patagonian dusts resulted in enhanced photochemical efficiency with differential responses linked to source region dust characteristics in terms of relative Fe/Mn solubility. Changes in the relative magnitude of dust deposition, combined with source region mineralogy, could hence determine whether Fe or Mn limitation control Southern Ocean productivity under future as well as past climate states.
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