气候变化领域集成服务门户(CCPortal): Sedimentation of ballasted cells-free EPS in meromictic Fayetteville Green Lake

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DOI	10.1111/gbi.12366
	Sedimentation of ballasted cells-free EPS in meromictic Fayetteville Green Lake
	Kamennaya N.A.; Hu P.; Jansson C.
发表日期	2020
ISSN	14724677
起始页码	80
结束页码	92
卷号	18 期号:1
英文摘要	Fayetteville Green Lake (FGL) is a recognized, extensively studied present-day model of the stratified Proterozoic ocean. Nonetheless, biomass sedimentation in FGL remains hard to explain: while virtually all sediment pigments belong to photosynthetic sulfur bacteria from a chemocline, the isotopic carbon signature of the bulk organic matter suggests its epilimnetic phytoplankton origin. To explain the epilimnetic origin of sedimented carbon, we studied the dominant Synechococci, isolated from FGL. Here, we present experimental evidence that FGL Synechococci produce copious extracellular polysaccharides (EPS) especially when availability of inorganic carbon (Ci) is high relative to availability of other macronutrients, for example phosphorus. The accumulating EPS become impregnated with calcium, magnesium, and sodium cations and are released to the environment as ballasted cell coverings. Sedimentation of these cell-free EPS can constitute the bulk of pigment-free organic material in FGL sediment. Because increased availability of Ci specifically stimulates production of EPS and the accumulated EPS adsorb cations and become ballasted, we propose the universal role of cyanobacterial EPS in biomass sedimentation in the high-Ci Paleoproterozoic ocean as well as in modern aquatic systems like FGL. © 2019 John Wiley & Sons Ltd
关键词	cyanobacterium exopolymer experimental design inorganic carbon isotopic composition model test organic matter paleoceanography phytoplankton polysaccharide sedimentation Fayetteville Green Lake New York [United States]United States Cyanobacteria carbon polysaccharide cyanobacterium lake phytoplankton Carbon Cyanobacteria Lakes Phytoplankton Polysaccharides
语种	英语
来源机构	Geobiology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/133211
推荐引用方式 GB/T 7714	Kamennaya N.A.,Hu P.,Jansson C.. Sedimentation of ballasted cells-free EPS in meromictic Fayetteville Green Lake[J]. Geobiology,2020,18(1).
APA	Kamennaya N.A.,Hu P.,&Jansson C..(2020).Sedimentation of ballasted cells-free EPS in meromictic Fayetteville Green Lake.,18(1).
MLA	Kamennaya N.A.,et al."Sedimentation of ballasted cells-free EPS in meromictic Fayetteville Green Lake".18.1(2020).