干旱区生态环境知识资源中心(Arid): Inorganic carbon fixation in ice-covered lakes of the McMurdo Dry Valleys

Arid

DOI	10.1017/S0954102019000075
	Inorganic carbon fixation in ice-covered lakes of the McMurdo Dry Valleys
	Vick-Majors, Trista J.1,2; Priscu, John C.1
通讯作者	Priscu, John C.
来源期刊	ANTARCTIC SCIENCE
ISSN	0954-1020
EISSN	1365-2079
出版年	2019
卷号	31 期号:3 页码:123-132
英文摘要	Inorganic carbon fixation, usually mediated by photosynthetic microorganisms, is considered to form the base of the food chain in aquatic ecosystems. In high-latitude lakes, lack of sunlight owing to seasonal solar radiation limits the activity of photosynthetic plankton during the polar winter, causing respiration-driven demand for carbon to exceed supply. Here, we show that inorganic carbon fixation in the dark, driven by organisms that gain energy from chemical reactions rather than sunlight (chemolithoautotrophs), provides a significant influx of fixed carbon to two permanently ice-covered lakes (Fryxell and East Bonney). Fryxell, which has higher biomass per unit volume of water, had higher rates of inorganic dark carbon fixation by chemolithoautotrophs than East Bonney (trophogenic zone average 1.0 mu g C l(-1) d(-1) vs 0.08 mu g C l(-1) d(-1), respectively). This contribution from dark carbon fixation was partly due to the activity of ammonia oxidizers, which are present in both lakes. Despite the potential importance of new carbon input by chemolithoautotrophic activity, both lakes remain net heterotrophic, with respiratory demand for carbon exceeding supply. Dark carbon fixation increased the ratio of new carbon supply to respiratory demand from 0.16 to 0.47 in Fryxell, and from 0.14 to 0.22 in East Bonney.
英文关键词	ammonia oxidation carbon budget chemolithoautotrophy chemoautotrophy
类型	Article
语种	英语
国家	USA
收录类别	SCI-E
WOS记录号	WOS:000471672400004
WOS关键词	ANTARCTIC LAKES ; POLAR NIGHT ; PHYTOPLANKTON ; COMMUNITIES ; DIVERSITY ; FRYXELL ; MICROPLANKTON ; BACTERIA ; DESERT
WOS类目	Environmental Sciences ; Geography, Physical ; Geosciences, Multidisciplinary
WOS研究方向	Environmental Sciences & Ecology ; Physical Geography ; Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214199
作者单位	1.Montana State Univ, Dept Land Resources & Environm Sci, 334 Leon Johnson Hall, Bozeman, MT 59717 USA; 2.Univ Montana, Flathead Lake Biol Stn, 32125 Bio Stn Lane, Polson, MT 59860 USA
推荐引用方式 GB/T 7714	Vick-Majors, Trista J.,Priscu, John C.. Inorganic carbon fixation in ice-covered lakes of the McMurdo Dry Valleys[J],2019,31(3):123-132.
APA	Vick-Majors, Trista J.,&Priscu, John C..(2019).Inorganic carbon fixation in ice-covered lakes of the McMurdo Dry Valleys.ANTARCTIC SCIENCE,31(3),123-132.
MLA	Vick-Majors, Trista J.,et al."Inorganic carbon fixation in ice-covered lakes of the McMurdo Dry Valleys".ANTARCTIC SCIENCE 31.3(2019):123-132.