Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance
The Southern Ocean is responsible for approximately 40% of oceanic carbon uptake through biological and physical processes. In the Southern Ocean, phytoplankton growth is limited by low iron (Fe) and light supply. Climate model projections for the Southern Ocean indicate that temperature, underwater...
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ftunivtasmania:oai:eprints.utas.edu.au:32504 2023-05-15T13:31:53+02:00 Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance Andrew, SM Morell, HT Strzepek, R Boyd, PW Ellwood, MJ 2019 application/pdf https://eprints.utas.edu.au/32504/ https://eprints.utas.edu.au/32504/1/137722%20-%20Iron%20availability%20influences%20the%20tolerance%20of%20Southern%20Ocean%20phytoplankton.pdf en eng Frontiers Research Foundation https://eprints.utas.edu.au/32504/1/137722%20-%20Iron%20availability%20influences%20the%20tolerance%20of%20Southern%20Ocean%20phytoplankton.pdf Andrew, SM, Morell, HT, Strzepek, R orcid:0000-0002-6442-7121 , Boyd, PW orcid:0000-0001-7850-1911 and Ellwood, MJ 2019 , 'Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance' , Frontiers in Marine Science, vol. 6, no. NOV , pp. 1-12 , doi:10.3389/fmars.2019.00681 <http://dx.doi.org/10.3389/fmars.2019.00681>. temperature climate change photosynthesis evolution multiple stressors carbon Article PeerReviewed 2019 ftunivtasmania https://doi.org/10.3389/fmars.2019.00681 2021-09-20T22:18:28Z The Southern Ocean is responsible for approximately 40% of oceanic carbon uptake through biological and physical processes. In the Southern Ocean, phytoplankton growth is limited by low iron (Fe) and light supply. Climate model projections for the Southern Ocean indicate that temperature, underwater irradiance and Fe supply are likely to change simultaneously in the future due to increasing anthropogenic carbon dioxide emissions. The individual effects of these environmental properties on phytoplankton physiology have been extensively researched, and culturing studies using Southern Ocean phytoplankton have shown that temperature and Fe will play a key role on setting growth under future conditions. To explore the potential responses of Southern Ocean phytoplankton to these environmental changes, we cultured the haptophyte Phaeocystis antarctica and the diatoms Chaetoceros flexuosus, Proboscia inermis, and Thalassiosira antarctica under two light and iron combinations and over a range of temperatures. Our study revealed that the thermal response curves of key Southern Ocean phytoplankton are diverse, with the highest growth rates measured at 5°C (the annual temperature range at the isolation sites is currently 1–4°C). Warming had species-specific effects on the photochemical efficiency of photosystem II (PSII; Fv/Fm), the functional absorption cross-section of PSII (σPSII), carbon:nitrogen ratio and cellular Chlorophyll a concentrations. Iron availability increased species’ ability to tolerate warmer conditions by increasing the upper limit for growth and subsequently increasing the thermal niche that each species inhabit. Article in Journal/Newspaper Antarc* Antarctica Southern Ocean University of Tasmania: UTas ePrints Southern Ocean Frontiers in Marine Science 6 |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
temperature climate change photosynthesis evolution multiple stressors carbon |
spellingShingle |
temperature climate change photosynthesis evolution multiple stressors carbon Andrew, SM Morell, HT Strzepek, R Boyd, PW Ellwood, MJ Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance |
topic_facet |
temperature climate change photosynthesis evolution multiple stressors carbon |
description |
The Southern Ocean is responsible for approximately 40% of oceanic carbon uptake through biological and physical processes. In the Southern Ocean, phytoplankton growth is limited by low iron (Fe) and light supply. Climate model projections for the Southern Ocean indicate that temperature, underwater irradiance and Fe supply are likely to change simultaneously in the future due to increasing anthropogenic carbon dioxide emissions. The individual effects of these environmental properties on phytoplankton physiology have been extensively researched, and culturing studies using Southern Ocean phytoplankton have shown that temperature and Fe will play a key role on setting growth under future conditions. To explore the potential responses of Southern Ocean phytoplankton to these environmental changes, we cultured the haptophyte Phaeocystis antarctica and the diatoms Chaetoceros flexuosus, Proboscia inermis, and Thalassiosira antarctica under two light and iron combinations and over a range of temperatures. Our study revealed that the thermal response curves of key Southern Ocean phytoplankton are diverse, with the highest growth rates measured at 5°C (the annual temperature range at the isolation sites is currently 1–4°C). Warming had species-specific effects on the photochemical efficiency of photosystem II (PSII; Fv/Fm), the functional absorption cross-section of PSII (σPSII), carbon:nitrogen ratio and cellular Chlorophyll a concentrations. Iron availability increased species’ ability to tolerate warmer conditions by increasing the upper limit for growth and subsequently increasing the thermal niche that each species inhabit. |
format |
Article in Journal/Newspaper |
author |
Andrew, SM Morell, HT Strzepek, R Boyd, PW Ellwood, MJ |
author_facet |
Andrew, SM Morell, HT Strzepek, R Boyd, PW Ellwood, MJ |
author_sort |
Andrew, SM |
title |
Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance |
title_short |
Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance |
title_full |
Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance |
title_fullStr |
Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance |
title_full_unstemmed |
Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance |
title_sort |
iron availability influences the tolerance of southern ocean phytoplankton to warming and elevated irradiance |
publisher |
Frontiers Research Foundation |
publishDate |
2019 |
url |
https://eprints.utas.edu.au/32504/ https://eprints.utas.edu.au/32504/1/137722%20-%20Iron%20availability%20influences%20the%20tolerance%20of%20Southern%20Ocean%20phytoplankton.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_relation |
https://eprints.utas.edu.au/32504/1/137722%20-%20Iron%20availability%20influences%20the%20tolerance%20of%20Southern%20Ocean%20phytoplankton.pdf Andrew, SM, Morell, HT, Strzepek, R orcid:0000-0002-6442-7121 , Boyd, PW orcid:0000-0001-7850-1911 and Ellwood, MJ 2019 , 'Iron availability influences the tolerance of Southern Ocean phytoplankton to warming and elevated irradiance' , Frontiers in Marine Science, vol. 6, no. NOV , pp. 1-12 , doi:10.3389/fmars.2019.00681 <http://dx.doi.org/10.3389/fmars.2019.00681>. |
op_doi |
https://doi.org/10.3389/fmars.2019.00681 |
container_title |
Frontiers in Marine Science |
container_volume |
6 |
_version_ |
1766022117592137728 |