Acantharian cysts: high flux occurrence in the bathypelagic zone of the Scotia Sea, Southern Ocean
Acantharian cysts: high flux occurrence in the bathypelagic zone of the Scotia Sea, Southern Ocean
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DOI：
10.1007/s00227-018-3376-1
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发表时间：
2018-06
期刊：
影响因子：
2.4
通讯作者：
A. Belcher;C. Manno;S. Thorpe;G. Tarling
中科院分区：
文献类型：
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作者：
A. Belcher;C. Manno;S. Thorpe;G. Tarling
2012年12月至2013年12月，在南大洋东北部斯科舍海1500米处部署的沉积物捕集器中记录了棘皮虫包囊的丰度和通量，为期12个月。放射虫原生生物（英语：Radiolarian protists）在全球都有发现，有非常致密的天青石骨架，并形成可以通过水柱快速下沉的包囊。然而，它们在海水中的溶解度很高，很少被发现对中层或深层的颗粒有机碳（POC）通量有显著贡献。我们测量了高达2706 ind. m−2day−1的棘孢囊通量，我们估计这将驱动5.1 mg C m−2day−1的POC通量。这些棘孢囊通量是前所未有的文献中，并占17%的年度POC通量在这个网站（0.5-26.0%）。高通量的棘孢囊（和相关的高POC通量）的测量突出了迫切需要进一步研究的生活周期的紫茎泽兰，以了解是什么驱动其孢囊的质量通量，并确定紫茎泽兰的生物碳泵的贡献。
The abundance and flux of acantharian cysts were recorded for a period of 12 months from December 2012 to 2013 in a sediment trap deployed at 1500 m in the north-eastern Scotia Sea, Southern Ocean. Acantharia (radiolarian protists) are found globally, have very dense celestite skeletons, and form cysts which can sink rapidly through the water column. However, they are highly soluble in seawater and have rarely been found to contribute significantly to fluxes of particulate organic carbon (POC) in mesopelagic or bathypelagic zones. We measured fluxes of acantharian cysts of up to 2706 ind. m−2day−1, which we estimate to drive a POC flux of 5.1 mg C m−2day−1. These acantharian cyst fluxes are unprecedented in the literature, and accounted for 17% of the annual POC flux at this site (0.5–26.0%). The high fluxes of acantharian cysts (and associated high POC fluxes) measured highlight the pressing need for further research into the life cycles of Acantharia to understand what drives the mass flux of their cysts, and to determine the contribution of Acantharia to the biological carbon pump.