Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges
The influence of global change on Southern Ocean productivity will have major ramifications for future management of polar life. A prior laboratory study investigated the response of a batch-cultured subantarctic diatom to projected change simulating conditions for 2100 (increased temperature/CO2/ir...
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Amer Soc Limnology Oceanography
2022
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Online Access: | https://eprints.utas.edu.au/46763/ https://eprints.utas.edu.au/46763/1/Limnology%20%20%20Oceanography%20-%202022%20-%20Boyd%20-%20Transitioning%20global%20change%20experiments%20on%20Southern%20Ocean%20phytoplankton%20from%20lab.pdf |
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ftunivtasmania:oai:eprints.utas.edu.au:46763 2023-05-15T17:11:04+02:00 Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges Boyd, PW Doney, SC Eggins, S Ellwood, MJ Fourquez, M Nunn, BL Strzepek, R Timmins-Schiffman, E 2022 application/pdf https://eprints.utas.edu.au/46763/ https://eprints.utas.edu.au/46763/1/Limnology%20%20%20Oceanography%20-%202022%20-%20Boyd%20-%20Transitioning%20global%20change%20experiments%20on%20Southern%20Ocean%20phytoplankton%20from%20lab.pdf en eng Amer Soc Limnology Oceanography https://eprints.utas.edu.au/46763/1/Limnology%20%20%20Oceanography%20-%202022%20-%20Boyd%20-%20Transitioning%20global%20change%20experiments%20on%20Southern%20Ocean%20phytoplankton%20from%20lab.pdf Boyd, PW orcid:0000-0001-7850-1911 , Doney, SC, Eggins, S, Ellwood, MJ, Fourquez, M, Nunn, BL, Strzepek, R orcid:0000-0002-6442-7121 and Timmins-Schiffman, E 2022 , 'Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges' , Limnology and Oceanography , pp. 1-20 , doi:10.1002/lno.12175 <http://dx.doi.org/10.1002/lno.12175>. global change Southern Ocean phytoplankton productivity omics physiology Article PeerReviewed 2022 ftunivtasmania https://doi.org/10.1002/lno.12175 2022-08-15T22:16:34Z The influence of global change on Southern Ocean productivity will have major ramifications for future management of polar life. A prior laboratory study investigated the response of a batch-cultured subantarctic diatom to projected change simulating conditions for 2100 (increased temperature/CO2/irradiance/iron; decreased macronutrients), showed a twofold higher chlorophyll-derived growth rate driven mainly by temperature and iron. We translated this design to the field to understand the phytoplankton community response, within a subantarctic foodweb, to 2100 conditions. A 7-d shipboard study utilizing 250-liter mesocosms was conducted in March 2016. The outcome mirrors lab-culture experiments, yielding twofold higher chlorophyll in the 2100 treatment relative to the control. This trend was also evident for intrinsic metrics including nutrient depletion. Unlike the lab-culture study, photosynthetic competence revealed a transient effect in the 2100 mesocosm, peaking on day 3 then declining. Metaproteomics revealed significant differences in protein profiles between treatments by day 7. The control proteome was enriched for photosynthetic processes (c.f. 2100) and exhibited iron-limitation signatures; the 2100 proteome exposed a shift in cellular energy production. Our findings of enhanced phytoplankton growth are comparable to model simulations, but underlying mechanisms (temperature, iron, and/or light) differ between experiments and models. Batch-culture approaches hinder cross-comparison of mesocosm findings to model simulations (the latter are akin to “continuous-culture chemostats”). However, chemostat techniques are problematic to use with mesocosms, as mesozooplankton will evade seawater flow-through, thereby accumulating. Thus, laboratory, field, and modeling approaches reveal challenges to be addressed to better understand how global change will alter Southern Ocean productivity. Article in Journal/Newspaper Mesozooplankton Southern Ocean University of Tasmania: UTas ePrints Southern Ocean Limnology and Oceanography |
institution |
Open Polar |
collection |
University of Tasmania: UTas ePrints |
op_collection_id |
ftunivtasmania |
language |
English |
topic |
global change Southern Ocean phytoplankton productivity omics physiology |
spellingShingle |
global change Southern Ocean phytoplankton productivity omics physiology Boyd, PW Doney, SC Eggins, S Ellwood, MJ Fourquez, M Nunn, BL Strzepek, R Timmins-Schiffman, E Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges |
topic_facet |
global change Southern Ocean phytoplankton productivity omics physiology |
description |
The influence of global change on Southern Ocean productivity will have major ramifications for future management of polar life. A prior laboratory study investigated the response of a batch-cultured subantarctic diatom to projected change simulating conditions for 2100 (increased temperature/CO2/irradiance/iron; decreased macronutrients), showed a twofold higher chlorophyll-derived growth rate driven mainly by temperature and iron. We translated this design to the field to understand the phytoplankton community response, within a subantarctic foodweb, to 2100 conditions. A 7-d shipboard study utilizing 250-liter mesocosms was conducted in March 2016. The outcome mirrors lab-culture experiments, yielding twofold higher chlorophyll in the 2100 treatment relative to the control. This trend was also evident for intrinsic metrics including nutrient depletion. Unlike the lab-culture study, photosynthetic competence revealed a transient effect in the 2100 mesocosm, peaking on day 3 then declining. Metaproteomics revealed significant differences in protein profiles between treatments by day 7. The control proteome was enriched for photosynthetic processes (c.f. 2100) and exhibited iron-limitation signatures; the 2100 proteome exposed a shift in cellular energy production. Our findings of enhanced phytoplankton growth are comparable to model simulations, but underlying mechanisms (temperature, iron, and/or light) differ between experiments and models. Batch-culture approaches hinder cross-comparison of mesocosm findings to model simulations (the latter are akin to “continuous-culture chemostats”). However, chemostat techniques are problematic to use with mesocosms, as mesozooplankton will evade seawater flow-through, thereby accumulating. Thus, laboratory, field, and modeling approaches reveal challenges to be addressed to better understand how global change will alter Southern Ocean productivity. |
format |
Article in Journal/Newspaper |
author |
Boyd, PW Doney, SC Eggins, S Ellwood, MJ Fourquez, M Nunn, BL Strzepek, R Timmins-Schiffman, E |
author_facet |
Boyd, PW Doney, SC Eggins, S Ellwood, MJ Fourquez, M Nunn, BL Strzepek, R Timmins-Schiffman, E |
author_sort |
Boyd, PW |
title |
Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges |
title_short |
Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges |
title_full |
Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges |
title_fullStr |
Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges |
title_full_unstemmed |
Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges |
title_sort |
transitioning global change experiments on southern ocean phytoplankton from lab to field settings: insights and challenges |
publisher |
Amer Soc Limnology Oceanography |
publishDate |
2022 |
url |
https://eprints.utas.edu.au/46763/ https://eprints.utas.edu.au/46763/1/Limnology%20%20%20Oceanography%20-%202022%20-%20Boyd%20-%20Transitioning%20global%20change%20experiments%20on%20Southern%20Ocean%20phytoplankton%20from%20lab.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Mesozooplankton Southern Ocean |
genre_facet |
Mesozooplankton Southern Ocean |
op_relation |
https://eprints.utas.edu.au/46763/1/Limnology%20%20%20Oceanography%20-%202022%20-%20Boyd%20-%20Transitioning%20global%20change%20experiments%20on%20Southern%20Ocean%20phytoplankton%20from%20lab.pdf Boyd, PW orcid:0000-0001-7850-1911 , Doney, SC, Eggins, S, Ellwood, MJ, Fourquez, M, Nunn, BL, Strzepek, R orcid:0000-0002-6442-7121 and Timmins-Schiffman, E 2022 , 'Transitioning global change experiments on Southern Ocean phytoplankton from lab to field settings: insights and challenges' , Limnology and Oceanography , pp. 1-20 , doi:10.1002/lno.12175 <http://dx.doi.org/10.1002/lno.12175>. |
op_doi |
https://doi.org/10.1002/lno.12175 |
container_title |
Limnology and Oceanography |
_version_ |
1766067925084536832 |