DOI: 10.1029/2018GB005877
论文题名: The Significance of Giant Phaeodarians (Rhizaria) to Biogenic Silica Export in the California Current Ecosystem
作者: Biard T. ; Krause J.W. ; Stukel M.R. ; Ohman M.D.
刊名: Global Biogeochemical Cycles
ISSN: 0886-6236
EISSN: 1944-9224
出版年: 2018
卷: 32, 期: 6 语种: 英语
英文关键词: allometry
; cell
; eukaryote
; euphotic zone
; flux measurement
; in situ measurement
; mesopelagic zone
; morphometry
; plankton
; sediment trap
; silica
; California Current
; Pacific Ocean
; Aulosphaeridae
; Phaeodarea
; Rhizaria
学科: California Current Ecosystem
; export
; in situ imagery
; marine silica cycle
; Phaeodaria
; Rhizaria
中文摘要: In marine ecosystems, many planktonic organisms precipitate biogenic silica (bSiO2) to build silicified skeletons. Among them, giant siliceous rhizarians (>500 μm), including Radiolaria and Phaeodaria, are important contributors to oceanic carbon pools but little is known about their contribution to the marine silica cycle. We report the first analyses of giant phaeodarians to bSiO2 export in the California Current Ecosystem. We measured the silica content of single rhizarian cells ranging in size from 470 to 3,920 μm and developed allometric equations to predict silica content (0.37–43.42 μg Si/cell) from morphometric measurements. Using sediment traps to measure phaeodarian fluxes from the euphotic zone on four cruises, we calculated bSiO2 export produced by two families, the Aulosphaeridae and Castanellidae. Biogenic silica export ranged from <0.01 to 0.63 mmol Si · m−2 · day−1. These two families alone contributed on average 10% (range 0–80%) of total bSiO2 export from the euphotic zone. Their proportional contributions increased substantially in more oligotrophic regions with lower bSiO2 fluxes. Using the in situ Underwater Vision Profiler 5, we characterized vertical distributions of the giant phaeodarian family Aulosphaeridae to a depth of 500 m and inferred their contribution to bSiO2 export in deeper waters. We found a significant increase of Aulosphaeridae export (<0.01 to 2.82 mmol Si · m−2 · day−1) when extended to mesopelagic depths. Using a global data set of in situ profiles, we estimated the significance of Aulosphaeridae to bSiO2 export and revealed that they can act as major exporters of bSiO2 to the mesopelagic zone in various regions. ©2018. 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/160221
Appears in Collections: 气候变化与战略
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作者单位: Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States; Dauphin Island Sea Lab, Dauphin Island, AL, United States; Department of Marine Sciences, University of South Alabama, Mobile, AL, United States; Earth, Ocean, and Atmospheric Science Department, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Biard T.,Krause J.W.,Stukel M.R.,et al. The Significance of Giant Phaeodarians (Rhizaria) to Biogenic Silica Export in the California Current Ecosystem[J]. Global Biogeochemical Cycles,2018-01-01,32(6)