Temperature-enhanced effects of iron on Southern Ocean phytoplankton
Iron (Fe) is a key limiting nutrient for Southern Ocean phytoplankton. Input of Fe into the Southern Ocean is projected to change due to global warming, yet the combined effects of a concurrent increase in temperature with Fe addition on phytoplankton growth and community composition are understudie...
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ftcopernicus:oai:publications.copernicus.org:egusphere120388 2024-09-15T17:47:43+00:00 Temperature-enhanced effects of iron on Southern Ocean phytoplankton Eich, Charlotte Manen, Mathijs McCain, J. Scott P. Jabre, Loay J. Poll, Willem H. Jung, Jinyoung Pont, Sven B. E. H. Tian, Hung-An Ardiningsih, Indah Reichart, Gert-Jan Bertrand, Erin M. Brussaard, Corina P. D. Middag, Rob 2024-05-24 application/pdf https://doi.org/10.5194/egusphere-2024-1508 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1508/ eng eng doi:10.5194/egusphere-2024-1508 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1508/ eISSN: Text 2024 ftcopernicus https://doi.org/10.5194/egusphere-2024-1508 2024-08-28T05:24:15Z Iron (Fe) is a key limiting nutrient for Southern Ocean phytoplankton. Input of Fe into the Southern Ocean is projected to change due to global warming, yet the combined effects of a concurrent increase in temperature with Fe addition on phytoplankton growth and community composition are understudied. To improve our understanding of how Antarctic phytoplankton communities respond to Fe and enhanced temperature, we performed four full factorial onboard bioassays under trace metal clean conditions with phytoplankton communities from different regions of the Weddell and the Amundsen Seas in the Southern Ocean. Treatments consisted of a combined 2 nM Fe addition with 2 °C warming treatment (TF), compared to the single factor treatments of Fe addition at in-situ temperature (F), and non-Fe addition at + 2 °C (T) and at in-situ temperature (C). Temperature had limited effect by itself but boosted the positive response of the phytoplankton to Fe addition. Photosynthetic efficiency, phytoplankton abundances, and chlorophyll a concentrations typically increased (significantly) with Fe addition (F and/or TF treatments) and the phytoplankton community generally shifted from haptophytes to diatoms upon Fe addition. The < 20 µm phytoplankton fraction displayed population-specific growth responses, resulting in a pronounced shift in community composition and size distribution (mainly towards larger-sized phytoplankton) for the F and TF treatment. Such distinct enhanced impact of Fe supply with warming on Antarctic phytoplankton size, growth and composition will likely affect trophic transfer efficiency and ecosystem structure, with potential significance for the biological carbon pump. Text Antarc* Antarctic Southern Ocean Copernicus Publications: E-Journals |
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Copernicus Publications: E-Journals |
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English |
description |
Iron (Fe) is a key limiting nutrient for Southern Ocean phytoplankton. Input of Fe into the Southern Ocean is projected to change due to global warming, yet the combined effects of a concurrent increase in temperature with Fe addition on phytoplankton growth and community composition are understudied. To improve our understanding of how Antarctic phytoplankton communities respond to Fe and enhanced temperature, we performed four full factorial onboard bioassays under trace metal clean conditions with phytoplankton communities from different regions of the Weddell and the Amundsen Seas in the Southern Ocean. Treatments consisted of a combined 2 nM Fe addition with 2 °C warming treatment (TF), compared to the single factor treatments of Fe addition at in-situ temperature (F), and non-Fe addition at + 2 °C (T) and at in-situ temperature (C). Temperature had limited effect by itself but boosted the positive response of the phytoplankton to Fe addition. Photosynthetic efficiency, phytoplankton abundances, and chlorophyll a concentrations typically increased (significantly) with Fe addition (F and/or TF treatments) and the phytoplankton community generally shifted from haptophytes to diatoms upon Fe addition. The < 20 µm phytoplankton fraction displayed population-specific growth responses, resulting in a pronounced shift in community composition and size distribution (mainly towards larger-sized phytoplankton) for the F and TF treatment. Such distinct enhanced impact of Fe supply with warming on Antarctic phytoplankton size, growth and composition will likely affect trophic transfer efficiency and ecosystem structure, with potential significance for the biological carbon pump. |
format |
Text |
author |
Eich, Charlotte Manen, Mathijs McCain, J. Scott P. Jabre, Loay J. Poll, Willem H. Jung, Jinyoung Pont, Sven B. E. H. Tian, Hung-An Ardiningsih, Indah Reichart, Gert-Jan Bertrand, Erin M. Brussaard, Corina P. D. Middag, Rob |
spellingShingle |
Eich, Charlotte Manen, Mathijs McCain, J. Scott P. Jabre, Loay J. Poll, Willem H. Jung, Jinyoung Pont, Sven B. E. H. Tian, Hung-An Ardiningsih, Indah Reichart, Gert-Jan Bertrand, Erin M. Brussaard, Corina P. D. Middag, Rob Temperature-enhanced effects of iron on Southern Ocean phytoplankton |
author_facet |
Eich, Charlotte Manen, Mathijs McCain, J. Scott P. Jabre, Loay J. Poll, Willem H. Jung, Jinyoung Pont, Sven B. E. H. Tian, Hung-An Ardiningsih, Indah Reichart, Gert-Jan Bertrand, Erin M. Brussaard, Corina P. D. Middag, Rob |
author_sort |
Eich, Charlotte |
title |
Temperature-enhanced effects of iron on Southern Ocean phytoplankton |
title_short |
Temperature-enhanced effects of iron on Southern Ocean phytoplankton |
title_full |
Temperature-enhanced effects of iron on Southern Ocean phytoplankton |
title_fullStr |
Temperature-enhanced effects of iron on Southern Ocean phytoplankton |
title_full_unstemmed |
Temperature-enhanced effects of iron on Southern Ocean phytoplankton |
title_sort |
temperature-enhanced effects of iron on southern ocean phytoplankton |
publishDate |
2024 |
url |
https://doi.org/10.5194/egusphere-2024-1508 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1508/ |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
eISSN: |
op_relation |
doi:10.5194/egusphere-2024-1508 https://egusphere.copernicus.org/preprints/2024/egusphere-2024-1508/ |
op_doi |
https://doi.org/10.5194/egusphere-2024-1508 |
_version_ |
1810497207627939840 |