DOI: 10.1002/2017GB005619
Scopus记录号: 2-s2.0-85018450799
论文题名: Picoplankton contribution to biogenic silica stocks and production rates in the Sargasso Sea
作者: Krause J ; W ; , Brzezinski M ; A ; , Baines S ; B ; , Collier J ; L ; , Twining B ; S ; , Ohnemus D ; C
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2017
卷: 31, 期: 5 起始页码: 762
结束页码: 774
语种: 英语
英文关键词: biogenic silica
; picoplankton
; Sargasso Sea
; Synechococcus
Scopus关键词: biogenic deposit
; biological production
; cyanobacterium
; diatom
; open ocean
; picoplankton
; silica
; size distribution
; Atlantic Ocean
; Sargasso Sea
; Bacillariophyta
; Synechococcus
英文摘要: Picocyanobacteria in the Sargasso Sea accumulate significant amounts of Si, a finding which questions how we interpret previous regional measurements of biogenic silica (bSi) production and the role of diatoms in the open ocean. The picoplankton (<3 μm cells) contributed a measurable, and at times significant, proportion of both the total bSi standing stock and its rate of production. The 100 m integrated bSi stock and bSi production rate in the <3 μm size fraction averaged 14% and 16%, respectively, of the total. At some stations, specific rates of bSi production in the <3 μm cells were up to threefold higher than for larger cells. But among all stations and depths, the two size fractions had statistically indistinguishable specific production rates (~0.35 day−1). The estimated contributions of Synechococcus alone to the 100 m integrated bSi stock and bSi production in cells <3 μm were 15% and 55%, respectively, suggesting that half of bSi production in this small size fraction could be sustained by Synechococcus, but a majority of the bSi was not associated with living Synechococcus. Our results suggest that picoplankton have a small but persistent regional contribution to bSi stocks, which is masked by a dynamic bSi pool driven by larger cells. While a significant fraction of bSi production is attributable to picoplankton, their contributions are likely to have been included in previous analyses, making prior regional budgets still relevant. However, our understanding of the factors controlling regional bSi production and our interpretations of particulate matter elemental ratios (e.g., Si:C) may require revision. ©2017. 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/77741
Appears in Collections: 气候变化事实与影响
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作者单位: Dauphin Island Sea Lab, Dauphin Island, AL, United States; Department of Marine Sciences, University of South Alabama, Mobile, AL, United States; Marine Science Institute and the Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, CA, United States; Department of Ecology and Evolution, Stony Brook University, Stony Brook, NY, United States; School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, United States; Bigelow Laboratory for Ocean Sciences, East Boothbay, ME, United States
Recommended Citation:
Krause J,W,, Brzezinski M,et al. Picoplankton contribution to biogenic silica stocks and production rates in the Sargasso Sea[J]. Global Biogeochemical Cycles,2017-01-01,31(5)