Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean
The Kerguelen Plateau is one of the regions in the Southern Ocean where spatially large algal blooms occur annually due to natural iron fertilization. The analysis of ocean color data as well as in situ samples collected during the Heard Earth-Ocean-Biosphere Interactions (HEOBI) voyage in January a...
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ftdoajarticles:oai:doaj.org/article:279453a84f0846eaa870aa7967975e55 2023-05-15T13:34:25+02:00 Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean Bożena Wojtasiewicz Thomas W. Trull Lesley Clementson Diana M. Davies Nicole L. Patten Christina Schallenberg Nick J. Hardman-Mountford 2019-09-01T00:00:00Z https://doi.org/10.3389/fmars.2019.00531 https://doaj.org/article/279453a84f0846eaa870aa7967975e55 EN eng Frontiers Media S.A. https://www.frontiersin.org/article/10.3389/fmars.2019.00531/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2019.00531 https://doaj.org/article/279453a84f0846eaa870aa7967975e55 Frontiers in Marine Science, Vol 6 (2019) Southern Ocean Heard Island iron fertilization phytoplankton chlorophyll backscattering Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2019 ftdoajarticles https://doi.org/10.3389/fmars.2019.00531 2022-12-31T01:45:10Z The Kerguelen Plateau is one of the regions in the Southern Ocean where spatially large algal blooms occur annually due to natural iron fertilization. The analysis of ocean color data as well as in situ samples collected during the Heard Earth-Ocean-Biosphere Interactions (HEOBI) voyage in January and February 2016, surprisingly revealed that chlorophyll a concentrations in waters located close to Heard and McDonald islands were much lower than those on the central Kerguelen Plateau. This occurs despite high levels of both glacial and volcanic iron supply from these islands. The analysis of pigment and optical data also indicated a shift in the phytoplankton size structure in this region, from a microphytoplankton to nanophytoplankton dominated community. Possible explanations for this high nutrient, high iron (Fe), low chlorophyll (HNHFeLC) phenomenon were explored. Low light availability due to deep mixing and shading by re-suspended sediment particles and augmented by dilution with surrounding low chlorophyll waters in the Antarctic Circumpolar Current was shown to be an important mechanism shaping phytoplankton communities. The competing dynamics between stimulation and limitation illustrate the complexity of short-term responses to our changing climate and cryosphere. Article in Journal/Newspaper Antarc* Antarctic Heard Island McDonald Islands Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Heard ENVELOPE(73.510,73.510,-53.117,-53.117) Heard Island Heard Island ENVELOPE(73.510,73.510,-53.117,-53.117) Kerguelen McDonald Islands ENVELOPE(72.600,72.600,-53.033,-53.033) Southern Ocean The Antarctic Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Southern Ocean Heard Island iron fertilization phytoplankton chlorophyll backscattering Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Southern Ocean Heard Island iron fertilization phytoplankton chlorophyll backscattering Science Q General. Including nature conservation geographical distribution QH1-199.5 Bożena Wojtasiewicz Thomas W. Trull Lesley Clementson Diana M. Davies Nicole L. Patten Christina Schallenberg Nick J. Hardman-Mountford Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean |
topic_facet |
Southern Ocean Heard Island iron fertilization phytoplankton chlorophyll backscattering Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
The Kerguelen Plateau is one of the regions in the Southern Ocean where spatially large algal blooms occur annually due to natural iron fertilization. The analysis of ocean color data as well as in situ samples collected during the Heard Earth-Ocean-Biosphere Interactions (HEOBI) voyage in January and February 2016, surprisingly revealed that chlorophyll a concentrations in waters located close to Heard and McDonald islands were much lower than those on the central Kerguelen Plateau. This occurs despite high levels of both glacial and volcanic iron supply from these islands. The analysis of pigment and optical data also indicated a shift in the phytoplankton size structure in this region, from a microphytoplankton to nanophytoplankton dominated community. Possible explanations for this high nutrient, high iron (Fe), low chlorophyll (HNHFeLC) phenomenon were explored. Low light availability due to deep mixing and shading by re-suspended sediment particles and augmented by dilution with surrounding low chlorophyll waters in the Antarctic Circumpolar Current was shown to be an important mechanism shaping phytoplankton communities. The competing dynamics between stimulation and limitation illustrate the complexity of short-term responses to our changing climate and cryosphere. |
format |
Article in Journal/Newspaper |
author |
Bożena Wojtasiewicz Thomas W. Trull Lesley Clementson Diana M. Davies Nicole L. Patten Christina Schallenberg Nick J. Hardman-Mountford |
author_facet |
Bożena Wojtasiewicz Thomas W. Trull Lesley Clementson Diana M. Davies Nicole L. Patten Christina Schallenberg Nick J. Hardman-Mountford |
author_sort |
Bożena Wojtasiewicz |
title |
Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean |
title_short |
Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean |
title_full |
Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean |
title_fullStr |
Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean |
title_full_unstemmed |
Factors Controlling the Lack of Phytoplankton Biomass in Naturally Iron Fertilized Waters Near Heard and McDonald Islands in the Southern Ocean |
title_sort |
factors controlling the lack of phytoplankton biomass in naturally iron fertilized waters near heard and mcdonald islands in the southern ocean |
publisher |
Frontiers Media S.A. |
publishDate |
2019 |
url |
https://doi.org/10.3389/fmars.2019.00531 https://doaj.org/article/279453a84f0846eaa870aa7967975e55 |
long_lat |
ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(73.510,73.510,-53.117,-53.117) ENVELOPE(72.600,72.600,-53.033,-53.033) |
geographic |
Antarctic Heard Heard Island Heard Island Kerguelen McDonald Islands Southern Ocean The Antarctic |
geographic_facet |
Antarctic Heard Heard Island Heard Island Kerguelen McDonald Islands Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Heard Island McDonald Islands Southern Ocean |
genre_facet |
Antarc* Antarctic Heard Island McDonald Islands Southern Ocean |
op_source |
Frontiers in Marine Science, Vol 6 (2019) |
op_relation |
https://www.frontiersin.org/article/10.3389/fmars.2019.00531/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2019.00531 https://doaj.org/article/279453a84f0846eaa870aa7967975e55 |
op_doi |
https://doi.org/10.3389/fmars.2019.00531 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
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1766052529322328064 |