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Author
Stukel, M.R. ; Biard, T. ; Krause, J.W. ; Ohman, M.D.
Title
Large Phaeodaria in the twilight zone: Their role in the carbon cycle
Type
$loc['typeJournal Article']
Year
2018
Publication
Association for the Sciences of Limnology and Oceanography
Abbreviated Journal
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Carbon cycle ; Ocean ; Twilight zone, Rhizarian measurements ; Aulosphaeridae
Abstract
Advances in in situ imaging allow enumeration of abundant populations of large Rhizarians that compose a substantial proportion of total mesozooplankton biovolume. Using a quasi-Lagrangian sampling scheme, we quantified the abundance, vertical distributions, and sinking‐related mortality of Aulosphaeridae, an abundant family of Phaeodaria in the California Current Ecosystem. Inter‐cruise variability was high, with average concentrations at the depth of maximum abundance ranging from < 10 to > 300 cells m−3, with seasonal and interannual variability associated with temperature‐preferences and regional shoaling of the 10°C isotherm. Vertical profiles showed that these organisms were consistently most abundant at 100�150 m depth. Average turnover times with respect to sinking were 4.7�10.9 d, equating to minimum in situ population growth rates of ~ 0.1�0.2 d−1. Using simultaneous measurements of sinking organic carbon, we find that these organisms could only meet their carbon demand if their carbon : volume ratio were ~ 1 μg C mm−3. This value is substantially lower than previously used in global estimates of rhizarian biomass, but is reasonable for organisms that use large siliceous tests to inflate their cross‐sectional area without a concomitant increase in biomass. We found that Aulosphaeridae alone can intercept > 20% of sinking particles produced in the euphotic zone before these particles reach a depth of 300 m. Our results suggest that the local (and likely global) carbon biomass of Aulosphaeridae, and probably the large Rhizaria overall, needs to be revised downwards, but that these organisms nevertheless play a major role in carbon flux attenuation in the twilight zone.
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$loc['yes']
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COAPS @ user @
Serial
967
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Author
Stukel, M. R. ; Song, H. ; Goericke, R. ; Miller, A.J.
Title
The role of subduction and gravitational sinking in particle export, carbon sequestration, and the remineralization length scale in the California Current Ecosystem
Type
$loc['typeJournal Article']
Year
2018
Publication
Limnology and Oceanography
Abbreviated Journal
Volume
63
Issue
1
Pages
363-383
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$loc['no']
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COAPS @ mfield @
Serial
362
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Author
Conroy, B.J. ; Steinberg, D.K. ; Stukel, M.R. ; Goes, J.I. ; Coles, V.J.
Title
Meso- and microzooplankton grazing in the Amazon River plume and western tropical North Atlantic
Type
$loc['typeJournal Article']
Year
2016
Publication
Limnology and Oceanography
Abbreviated Journal
Limnol. Oceanogr.
Volume
61
Issue
3
Pages
825-840
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0024-3590
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$loc['no']
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COAPS @ mfield @
Serial
74
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