The Significance of Giant Phaeodarians (Rhizaria) to Biogenic Silica Export in the California Current Ecosystem

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...

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Bibliographic Details
Published in:Global biogeochemical cycles 2018-06, Vol.32 (6), p.987-1004
Main Authors: Biard, Tristan, Krause, Jeffrey W., Stukel, Michael R., Ohman, Mark D.
Format: Article
Language:English
Subjects:
Allometry
California Current
California Current Ecosystem
Cruises
Ecosystems
Euphotic zone
export
Exports
Fluxes
Geographical variations
in situ imagery
Marine ecosystems
marine silica cycle
Mathematical models
Mesopelagic zone
Morphometry
Ocean circulation
Pelagic zone
Phaeodaria
Profiles
Regions
Rhizaria
Sediment traps
Silica
Silicon dioxide
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Summary: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
ISSN:0886-6236
1944-9224
DOI:10.1029/2018GB005877