气候变化领域集成服务门户(CCPortal): Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica

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DOI	10.1111/gbi.12353
	Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica
	Matys E.D.; Mackey T.; Grettenberger C.; Mueller E.; Jungblut A.; Sumner D.Y.; Hawes I.; Summons R.E.
发表日期	2019
ISSN	14724677
起始页码	551
结束页码	563
卷号	17 期号:5
英文摘要	Bacteriohopanepolyols (BHPs) are pentacyclic triterpenoid lipids that contribute to the structural integrity and physiology of some bacteria. Because some BHPs originate from specific classes of bacteria, BHPs have potential as taxonomically and environmentally diagnostic biomarkers. For example, a stereoisomer of bacteriohopanetetrol (informally BHT II) has been associated with anaerobic ammonium oxidation (anammox) bacteria and suboxic to anoxic marine environments where anammox is active. As a result, the detection of BHT II in the sedimentary record and fluctuations in the relative abundance of BHT II may inform reconstructions of nitrogen cycling and ocean redox changes through the geological record. However, there are uncertainties concerning the sources of BHT II and whether or not BHT II is produced in abundance in non-marine environments, both of which are pertinent to interpretations of BHT II signatures in sediments. To address these questions, we investigate the BHP composition of benthic microbial mats from Lake Fryxell, Antarctica. Lake Fryxell is a perennially ice-covered lake with a sharp oxycline in a density-stabilized water column. We describe the diversity and abundance of BHPs in benthic microbial mats across a transect from oxic to anoxic conditions. Generally, BHP abundances and diversity vary with the morphologies of microbial mats, which were previously shown to reflect local environmental conditions, such as irradiance and oxygen and sulfide concentrations. BHT II was identified in mats that exist within oxic to anoxic portions of the lake. However, anammox bacteria have yet to be identified in Lake Fryxell. We examine our results in the context of BHPs as biomarkers in modern and ancient environments. © 2019 John Wiley & Sons Ltd
关键词	ammonium compound benthos biomarker environmental conditions geological record lipid marine environment microbial mat nitrogen cycle oxidation reconstruction relative abundance Antarctica East Antarctica Lake Fryxell McMurdo Dry Valleys lipid pentacyclic triterpene polymer polyol Antarctica bacterial phenomena and functions bacterium chemistry lake metabolism sediment Antarctic Regions Bacteria Bacterial Physiological Phenomena Geologic Sediments Lakes Lipids Pentacyclic Triterpenes Polymers
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/133244
推荐引用方式 GB/T 7714	Matys E.D.,Mackey T.,Grettenberger C.,et al. Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica[J]. Geobiology,2019,17(5).
APA	Matys E.D..,Mackey T..,Grettenberger C..,Mueller E..,Jungblut A..,...&Summons R.E..(2019).Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica.,17(5).
MLA	Matys E.D.,et al."Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica".17.5(2019).