气候变化领域集成服务门户(CCPortal): Sponge skeletons as an important sink of silicon in the global oceans

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DOI	10.1038/s41561-019-0430-7
	Sponge skeletons as an important sink of silicon in the global oceans
	Maldonado M.; López-Acosta M.; Sitjà C.; García-Puig M.; Galobart C.; Ercilla G.; Leynaert A.
发表日期	2019
ISSN	17520894
卷号	12 期号:10
英文摘要	Silicon (Si) is a pivotal element in the biogeochemical and ecological functioning of the ocean. The marine Si cycle is thought to be in internal equilibrium, but the recent discovery of Si entries through groundwater and glacial melting have increased the known Si inputs relative to the outputs in the global oceans. Known outputs are due to the burying of diatom skeletons or their conversion into authigenic clay by reverse weathering. Here we show that non-phototrophic organisms, such as sponges and radiolarians, also facilitate significant Si burial through their siliceous skeletons. Microscopic examination and digestion of sediments revealed that most burial occurs through sponge skeletons, which, being unusually resistant to dissolution, had passed unnoticed in the biogeochemical inventories of sediments. The preservation of sponge spicules in sediments was 45.2 ± 27.4%, but only 6.8 ± 10.1% for radiolarian testa and 8% for diatom frustules. Sponges lead to a global burial flux of 1.71 ± 1.61 TmolSi yr−1 and only 0.09 ± 0.05 TmolSi yr−1 occurs through radiolarians. Collectively, these two non-phototrophically produced silicas increase the Si output of the ocean to 12.8 TmolSi yr−1, which accounts for a previously ignored sink that is necessary to adequately assess the global balance of the marine Si cycle. © 2019, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	biogeochemical cycle; biogeochemistry; burial diagenesis; diatom; digestibility; glacial deposit; global ocean; photoautotrophy; preservation; radiolaria; silicon; skeleton; sponge; Bacillariophyta; Radiolaria (protozoans)
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/124601
作者单位	Center for Advanced Studies of Blanes (CEAB), Spanish National Research Council (CSIC), Girona, Spain; Institute of Marine Sciences (ICM-CSIC), Barcelona, Spain; University of Brest, CNRS, LEMAR, Plouzané, France
推荐引用方式 GB/T 7714	Maldonado M.,López-Acosta M.,Sitjà C.,et al. Sponge skeletons as an important sink of silicon in the global oceans[J],2019,12(10).
APA	Maldonado M..,López-Acosta M..,Sitjà C..,García-Puig M..,Galobart C..,...&Leynaert A..(2019).Sponge skeletons as an important sink of silicon in the global oceans.Nature Geoscience,12(10).
MLA	Maldonado M.,et al."Sponge skeletons as an important sink of silicon in the global oceans".Nature Geoscience 12.10(2019).