DOI: 10.1002/gbc.20030
Scopus记录号: 2-s2.0-84878899214
论文题名: Dark inorganic carbon fixation sustains the functioning of benthic deep-sea ecosystems
作者: Molari M ; , Manini E ; , Dell'Anno A
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 1 起始页码: 212
结束页码: 221
语种: 英语
英文关键词: carbon cycle
; deep-sea sediments
; ecosystem functioning
; microbial metabolism
Scopus关键词: Assemblage composition
; Carbon cycles
; Chemosynthetic process
; Deep sea sediment
; Depth-related patterns
; Ecosystem functioning
; Fluorescence in situ hybridization
; Microbial metabolism
; Amino acids
; Ecosystems
; Fluorescence microscopy
; Metabolism
; Physiology
; Carbon
; abundance
; amino acid
; benthos
; biomass
; carbon cycle
; carbon fixation
; chemosynthesis
; deep sea
; ecosystem function
; food web
; inorganic carbon
; marine ecosystem
; marine sediment
; prokaryote
; Atlantic Ocean
; Atlantic Ocean (Northeast)
; Mediterranean Sea
英文摘要: Previous studies have provided evidence that dark inorganic carbon fixation is an important process for the functioning of the ocean interior. However, its quantitative relevance and ecological significance in benthic deep-sea ecosystems remain unknown. We investigated the rates of inorganic carbon fixation together with prokaryotic abundance, biomass, assemblage composition, and heterotrophic carbon production in surface sediments of different benthic deep-sea systems along the Iberian margin (northeastern Atlantic Ocean) and in the Mediterranean Sea. Inorganic carbon fixation rates in these surface deep-sea sediments did not show clear depth-related patterns, and, on average, they accounted for 19% of the total heterotrophic biomass production. The incorporation rates of inorganic carbon were significantly related to the abundance of total Archaea (as determined by catalyzed reporter deposition fluorescence in situ hybridization) and completely inhibited using an inhibitor of archaeal metabolism, N1-guanyl-1,7-diaminoheptane. This suggests a major role of the archaeal assemblages in inorganic carbon fixation. We also show that benthic archaeal assemblages contribute approximately 25% of the total 3H-leucine incorporation. Inorganic carbon fixation in surface deep-sea sediments appears to be dependent not only upon chemosynthetic processes but also on heterotrophic/mixotrophic metabolism, as suggested by estimates of the chemolithotrophic energy requirements and the enhanced inorganic carbon fixation due to the increase in the availability of organic trophic resources. Overall, our data suggest that archaeal assemblages of surface deep-sea sediments are responsible for the high rates of inorganic carbon incorporation and thereby sustain the functioning of the food webs as well as influence the carbon cycling of benthic deep-sea ecosystems. ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77619
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Institute for Marine Science-Italian National Research Council (ISMAR-CNR), Ancona, Italy; Department of Life and Environmental Sciences, Università Politecnica Delle Marche, Via Brecce Bianche, IT-60131 Ancona, Italy
Recommended Citation:
Molari M,, Manini E,, Dell'Anno A. Dark inorganic carbon fixation sustains the functioning of benthic deep-sea ecosystems[J]. Global Biogeochemical Cycles,2013-01-01,27(1)