The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean
Natural iron fertilization downstream of Southern Ocean island plateaus supports large phytoplankton blooms and promotes carbon export from the mixed layer. In addition to sequestering atmospheric CO 2 , the biological carbon pump also supplies organic matter (OM) to deep-ocean ecosystems. Although...
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ftdoajarticles:oai:doaj.org/article:fbda7048b6534a818d369e15f359d392 2023-05-15T18:24:47+02:00 The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean M. Rembauville S. Blain C. Manno G. Tarling A. Thompson G. Wolff I. Salter 2018-05-01T00:00:00Z https://doi.org/10.5194/bg-15-3071-2018 https://doaj.org/article/fbda7048b6534a818d369e15f359d392 EN eng Copernicus Publications https://www.biogeosciences.net/15/3071/2018/bg-15-3071-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-3071-2018 1726-4170 1726-4189 https://doaj.org/article/fbda7048b6534a818d369e15f359d392 Biogeosciences, Vol 15, Pp 3071-3084 (2018) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2018 ftdoajarticles https://doi.org/10.5194/bg-15-3071-2018 2022-12-31T10:48:27Z Natural iron fertilization downstream of Southern Ocean island plateaus supports large phytoplankton blooms and promotes carbon export from the mixed layer. In addition to sequestering atmospheric CO 2 , the biological carbon pump also supplies organic matter (OM) to deep-ocean ecosystems. Although the total flux of OM arriving at the seafloor sets the energy input to the system, the chemical nature of OM is also of significance. However, a quantitative framework linking ecological flux vectors to OM composition is currently lacking. In the present study we report the lipid composition of export fluxes collected by five moored sediment traps deployed in contrasting productivity regimes of Southern Ocean island systems (Kerguelen, Crozet and South Georgia) and compile them with quantitative data on diatom and faecal pellet fluxes. At the three naturally iron-fertilized sites, the relative contribution of labile lipids (mono- and polyunsaturated fatty acids, unsaturated fatty alcohols) is 2–4 times higher than at low productivity sites. There is a strong attenuation of labile components as a function of depth, irrespective of productivity. The three island systems also display regional characteristics in lipid export. An enrichment of zooplankton dietary sterols, such as C 27 Δ 5 , at South Georgia is consistent with high zooplankton and krill biomass in the region and the importance of faecal pellets to particulate organic carbon (POC) flux. There is a strong association of diatom resting spore fluxes that dominate productive flux regimes with energy-rich unsaturated fatty acids. At the Kerguelen Plateau we provide a statistical framework to link seasonal variation in ecological flux vectors and lipid composition over a complete annual cycle. Our analyses demonstrate that ecological processes in the upper ocean, e.g. resting spore formation and grazing, not only impact the magnitude and stoichiometry of the Southern Ocean biological pump, but also regulate the composition of exported OM and the nature of ... Article in Journal/Newspaper Southern Ocean Ocean Island Directory of Open Access Journals: DOAJ Articles Southern Ocean Kerguelen Biogeosciences 15 10 3071 3084 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 M. Rembauville S. Blain C. Manno G. Tarling A. Thompson G. Wolff I. Salter The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Natural iron fertilization downstream of Southern Ocean island plateaus supports large phytoplankton blooms and promotes carbon export from the mixed layer. In addition to sequestering atmospheric CO 2 , the biological carbon pump also supplies organic matter (OM) to deep-ocean ecosystems. Although the total flux of OM arriving at the seafloor sets the energy input to the system, the chemical nature of OM is also of significance. However, a quantitative framework linking ecological flux vectors to OM composition is currently lacking. In the present study we report the lipid composition of export fluxes collected by five moored sediment traps deployed in contrasting productivity regimes of Southern Ocean island systems (Kerguelen, Crozet and South Georgia) and compile them with quantitative data on diatom and faecal pellet fluxes. At the three naturally iron-fertilized sites, the relative contribution of labile lipids (mono- and polyunsaturated fatty acids, unsaturated fatty alcohols) is 2–4 times higher than at low productivity sites. There is a strong attenuation of labile components as a function of depth, irrespective of productivity. The three island systems also display regional characteristics in lipid export. An enrichment of zooplankton dietary sterols, such as C 27 Δ 5 , at South Georgia is consistent with high zooplankton and krill biomass in the region and the importance of faecal pellets to particulate organic carbon (POC) flux. There is a strong association of diatom resting spore fluxes that dominate productive flux regimes with energy-rich unsaturated fatty acids. At the Kerguelen Plateau we provide a statistical framework to link seasonal variation in ecological flux vectors and lipid composition over a complete annual cycle. Our analyses demonstrate that ecological processes in the upper ocean, e.g. resting spore formation and grazing, not only impact the magnitude and stoichiometry of the Southern Ocean biological pump, but also regulate the composition of exported OM and the nature of ... |
format |
Article in Journal/Newspaper |
author |
M. Rembauville S. Blain C. Manno G. Tarling A. Thompson G. Wolff I. Salter |
author_facet |
M. Rembauville S. Blain C. Manno G. Tarling A. Thompson G. Wolff I. Salter |
author_sort |
M. Rembauville |
title |
The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean |
title_short |
The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean |
title_full |
The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean |
title_fullStr |
The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean |
title_full_unstemmed |
The role of diatom resting spores in pelagic–benthic coupling in the Southern Ocean |
title_sort |
role of diatom resting spores in pelagic–benthic coupling in the southern ocean |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/bg-15-3071-2018 https://doaj.org/article/fbda7048b6534a818d369e15f359d392 |
geographic |
Southern Ocean Kerguelen |
geographic_facet |
Southern Ocean Kerguelen |
genre |
Southern Ocean Ocean Island |
genre_facet |
Southern Ocean Ocean Island |
op_source |
Biogeosciences, Vol 15, Pp 3071-3084 (2018) |
op_relation |
https://www.biogeosciences.net/15/3071/2018/bg-15-3071-2018.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-15-3071-2018 1726-4170 1726-4189 https://doaj.org/article/fbda7048b6534a818d369e15f359d392 |
op_doi |
https://doi.org/10.5194/bg-15-3071-2018 |
container_title |
Biogeosciences |
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15 |
container_issue |
10 |
container_start_page |
3071 |
op_container_end_page |
3084 |
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1766205671438548992 |