Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone
he high nutrient–low chlorophyll condition of the Southern Ocean is generally thought to be caused by the low bioavailability of micronutrients, particularly iron, which plays an integral role in phytoplankton photosynthesis. Nevertheless, the Southern Ocean experiences seasonal blooms that generall...
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2023
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Online Access: | https://hdl.handle.net/10037/30465 https://doi.org/10.5194/bg-20-3073-2023 |
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ftunivtroemsoe:oai:munin.uit.no:10037/30465 2023-09-26T15:10:50+02:00 Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone Singh, Asmita Fietz, Susanne Thomalla, Sandy J. Sanchez, Nicolas Ardelan, Murat V. Moreau, Sebastian Kauko, Hanna Maria Fransson, Agneta Chierici, Melissa Samanta, Saumik Mtshali, Thato N. Roychoudhury, Alakendra N. Ryan-Keogh, Thomas J. 2023-07-31 https://hdl.handle.net/10037/30465 https://doi.org/10.5194/bg-20-3073-2023 eng eng Copernicus Publications Biogeosciences Singh A, Fietz S, Thomalla SJ, Sanchez N, Ardelan, Moreau S, Kauko HM, Fransson A, Chierici M, Samanta, Mtshali, Roychoudhury AN, Ryan-Keogh TJ. Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone. Biogeosciences. 2023;20:3073-3091 FRIDAID 2169595 doi:10.5194/bg-20-3073-2023 1726-4170 1726-4189 https://hdl.handle.net/10037/30465 Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 Journal article Tidsskriftartikkel Peer reviewed publishedVersion 2023 ftunivtroemsoe https://doi.org/10.5194/bg-20-3073-2023 2023-08-30T23:07:30Z he high nutrient–low chlorophyll condition of the Southern Ocean is generally thought to be caused by the low bioavailability of micronutrients, particularly iron, which plays an integral role in phytoplankton photosynthesis. Nevertheless, the Southern Ocean experiences seasonal blooms that generally initiate in austral spring, peak in summer, and extend into autumn. This seasonal increase in primary productivity is typically linked to the seasonal characteristics of nutrient and light supply. To better understand the potential limitations on productivity in the Antarctic sea-ice zone (SIZ), the photophysiological response of phytoplankton to iron addition (2.0 nM FeCl3) was investigated during autumn along the Antarctic coast off Dronning Maud Land. Five short-term (24 h) incubation experiments were conducted around Astrid Ridge (68∘ S) and along a 6∘ E transect, where an autumn bloom was identified in the region of the western SIZ. Surface iron concentrations ranged from 0.27 to 1.39 nM around Astrid Ridge, and 0.56 to 0.63 nM along the 6∘ E transect. Contrary to expectation, the photophysiological response of phytoplankton to iron addition, measured through the photosynthetic efficiency and the absorption cross-section for photosystem II, showed no significant responses. It is thus proposed that since the autumn phytoplankton in the SIZ exhibited a lack of an iron limitation at the time of sampling, the ambient iron concentrations may have been sufficient to fulfil the cellular requirements. This provides new insights into extended iron replete post-bloom conditions in the typically assumed iron deficient high nutrient–low chlorophyll Southern Ocean Article in Journal/Newspaper Antarc* Antarctic Dronning Maud Land Sea ice Southern Ocean University of Tromsø: Munin Open Research Archive Antarctic Astrid Ridge ENVELOPE(12.000,12.000,-68.000,-68.000) Austral Dronning Maud Land Southern Ocean The Antarctic Biogeosciences 20 14 3073 3091 |
institution |
Open Polar |
collection |
University of Tromsø: Munin Open Research Archive |
op_collection_id |
ftunivtroemsoe |
language |
English |
description |
he high nutrient–low chlorophyll condition of the Southern Ocean is generally thought to be caused by the low bioavailability of micronutrients, particularly iron, which plays an integral role in phytoplankton photosynthesis. Nevertheless, the Southern Ocean experiences seasonal blooms that generally initiate in austral spring, peak in summer, and extend into autumn. This seasonal increase in primary productivity is typically linked to the seasonal characteristics of nutrient and light supply. To better understand the potential limitations on productivity in the Antarctic sea-ice zone (SIZ), the photophysiological response of phytoplankton to iron addition (2.0 nM FeCl3) was investigated during autumn along the Antarctic coast off Dronning Maud Land. Five short-term (24 h) incubation experiments were conducted around Astrid Ridge (68∘ S) and along a 6∘ E transect, where an autumn bloom was identified in the region of the western SIZ. Surface iron concentrations ranged from 0.27 to 1.39 nM around Astrid Ridge, and 0.56 to 0.63 nM along the 6∘ E transect. Contrary to expectation, the photophysiological response of phytoplankton to iron addition, measured through the photosynthetic efficiency and the absorption cross-section for photosystem II, showed no significant responses. It is thus proposed that since the autumn phytoplankton in the SIZ exhibited a lack of an iron limitation at the time of sampling, the ambient iron concentrations may have been sufficient to fulfil the cellular requirements. This provides new insights into extended iron replete post-bloom conditions in the typically assumed iron deficient high nutrient–low chlorophyll Southern Ocean |
format |
Article in Journal/Newspaper |
author |
Singh, Asmita Fietz, Susanne Thomalla, Sandy J. Sanchez, Nicolas Ardelan, Murat V. Moreau, Sebastian Kauko, Hanna Maria Fransson, Agneta Chierici, Melissa Samanta, Saumik Mtshali, Thato N. Roychoudhury, Alakendra N. Ryan-Keogh, Thomas J. |
spellingShingle |
Singh, Asmita Fietz, Susanne Thomalla, Sandy J. Sanchez, Nicolas Ardelan, Murat V. Moreau, Sebastian Kauko, Hanna Maria Fransson, Agneta Chierici, Melissa Samanta, Saumik Mtshali, Thato N. Roychoudhury, Alakendra N. Ryan-Keogh, Thomas J. Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone |
author_facet |
Singh, Asmita Fietz, Susanne Thomalla, Sandy J. Sanchez, Nicolas Ardelan, Murat V. Moreau, Sebastian Kauko, Hanna Maria Fransson, Agneta Chierici, Melissa Samanta, Saumik Mtshali, Thato N. Roychoudhury, Alakendra N. Ryan-Keogh, Thomas J. |
author_sort |
Singh, Asmita |
title |
Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone |
title_short |
Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone |
title_full |
Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone |
title_fullStr |
Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone |
title_full_unstemmed |
Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone |
title_sort |
absence of photophysiological response to iron addition in autumn phytoplankton in the antarctic sea-ice zone |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://hdl.handle.net/10037/30465 https://doi.org/10.5194/bg-20-3073-2023 |
long_lat |
ENVELOPE(12.000,12.000,-68.000,-68.000) |
geographic |
Antarctic Astrid Ridge Austral Dronning Maud Land Southern Ocean The Antarctic |
geographic_facet |
Antarctic Astrid Ridge Austral Dronning Maud Land Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Dronning Maud Land Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Dronning Maud Land Sea ice Southern Ocean |
op_relation |
Biogeosciences Singh A, Fietz S, Thomalla SJ, Sanchez N, Ardelan, Moreau S, Kauko HM, Fransson A, Chierici M, Samanta, Mtshali, Roychoudhury AN, Ryan-Keogh TJ. Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone. Biogeosciences. 2023;20:3073-3091 FRIDAID 2169595 doi:10.5194/bg-20-3073-2023 1726-4170 1726-4189 https://hdl.handle.net/10037/30465 |
op_rights |
Attribution 4.0 International (CC BY 4.0) openAccess Copyright 2023 The Author(s) https://creativecommons.org/licenses/by/4.0 |
op_doi |
https://doi.org/10.5194/bg-20-3073-2023 |
container_title |
Biogeosciences |
container_volume |
20 |
container_issue |
14 |
container_start_page |
3073 |
op_container_end_page |
3091 |
_version_ |
1778148960107495424 |