Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton
Phytoplankton productivity in the polar Southern Ocean (SO) plays an important role in the transfer of carbon from the atmosphere to the ocean’s interior, a process called the biological carbon pump, which helps regulate global climate. SO productivity in turn is limited by low iron, light, and temp...
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University of Tasmania, Australia
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Online Access: | https://researchdata.ands.org.au/photosynthetic-adaptation-low-ocean-phytoplankton/1424968 http://metadata.imas.utas.edu.au:/geonetwork/srv/en/metadata.show?uuid=6fbeb554-352b-4b79-b986-debfff6e3a01 https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/1810886116.full.pdf https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/pnas.1810886116.sapp.pdf |
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ftands:oai:ands.org.au::1424968 2023-05-15T13:52:00+02:00 Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton Strzepek, Robert, Dr (hasPrincipalInvestigator) Strzepek, Robert, Dr (pointOfContact) Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) (hasAssociationWith) Spatial: northlimit=-42.7931625259; southlimit=-42.9849030764; westlimit=147.197753906; eastLimit=147.505371094 Temporal: From 2017-01-01 to 2019-01-23 https://researchdata.ands.org.au/photosynthetic-adaptation-low-ocean-phytoplankton/1424968 http://metadata.imas.utas.edu.au:/geonetwork/srv/en/metadata.show?uuid=6fbeb554-352b-4b79-b986-debfff6e3a01 https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/1810886116.full.pdf https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/pnas.1810886116.sapp.pdf unknown University of Tasmania, Australia https://researchdata.ands.org.au/photosynthetic-adaptation-low-ocean-phytoplankton/1424968 6fbeb554-352b-4b79-b986-debfff6e3a01 http://metadata.imas.utas.edu.au:/geonetwork/srv/en/metadata.show?uuid=6fbeb554-352b-4b79-b986-debfff6e3a01 https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/1810886116.full.pdf https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/pnas.1810886116.sapp.pdf http://metadata.imas.utas.edu.au biota iron light temperature Eucampia antarctica Proboscia inermis Phaeocystis antarctica Thalassiosira oceanica Thalassiosira weissflogii PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS PHOTOSYNTHESIS ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS dataset ftands 2020-01-05T22:41:48Z Phytoplankton productivity in the polar Southern Ocean (SO) plays an important role in the transfer of carbon from the atmosphere to the ocean’s interior, a process called the biological carbon pump, which helps regulate global climate. SO productivity in turn is limited by low iron, light, and temperature, which restrict the ef- ficiency of the carbon pump. Iron and light can colimit productivity due to the high iron content of the photosynthetic photosystems and the need for increased photosystems for low-light acclimation in many phytoplankton. Here we show that SO phytoplankton have evolved critical adaptations to enhance photosynthetic rates under the joint constraints of low iron, light, and temperature. Under growth-limiting iron and light levels, three SO species had up to sixfold higher photosynthetic rates per photosystem II and similar or higher rates per mol of photosynthetic iron than tem- perate species, despite their lower growth temperature (3 vs. 18 °C) and light intensity (30 vs. 40 μmol quanta·m2·s−1), which should have decreased photosynthetic rates. These unexpectedly high rates in the SO species are partly explained by their unusually large photosynthetic antennae, which are among the largest ever recorded in marine phytoplankton. Large antennae are disadvan- tageous at low light intensities because they increase excitation energy loss as heat, but this loss may be mitigated by the low SO temperatures. Such adaptations point to higher SO production rates than environmental conditions should otherwise permit, with implications for regional ecology and biogeochemistry. Southern Ocean phytoplankton isolates were grown under trace metal clean conditions in a low temperature incubator under low and high iron concentrations at sub saturating continuous light. The cultures were sampled for growth rates, intracellular iron and carbon concentrations, and photosynthetic rates and composition. Dataset Antarc* Antarctica Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Southern Ocean ENVELOPE(147.197753906,147.505371094,-42.7931625259,-42.9849030764) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
biota iron light temperature Eucampia antarctica Proboscia inermis Phaeocystis antarctica Thalassiosira oceanica Thalassiosira weissflogii PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS PHOTOSYNTHESIS ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS |
spellingShingle |
biota iron light temperature Eucampia antarctica Proboscia inermis Phaeocystis antarctica Thalassiosira oceanica Thalassiosira weissflogii PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS PHOTOSYNTHESIS ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton |
topic_facet |
biota iron light temperature Eucampia antarctica Proboscia inermis Phaeocystis antarctica Thalassiosira oceanica Thalassiosira weissflogii PHYTOPLANKTON EARTH SCIENCE BIOSPHERE AQUATIC ECOSYSTEMS PLANKTON EARTH SCIENCE | BIOSPHERE | ECOSYSTEMS | MARINE ECOSYSTEMS PHOTOSYNTHESIS ECOLOGICAL DYNAMICS ECOSYSTEM FUNCTIONS |
description |
Phytoplankton productivity in the polar Southern Ocean (SO) plays an important role in the transfer of carbon from the atmosphere to the ocean’s interior, a process called the biological carbon pump, which helps regulate global climate. SO productivity in turn is limited by low iron, light, and temperature, which restrict the ef- ficiency of the carbon pump. Iron and light can colimit productivity due to the high iron content of the photosynthetic photosystems and the need for increased photosystems for low-light acclimation in many phytoplankton. Here we show that SO phytoplankton have evolved critical adaptations to enhance photosynthetic rates under the joint constraints of low iron, light, and temperature. Under growth-limiting iron and light levels, three SO species had up to sixfold higher photosynthetic rates per photosystem II and similar or higher rates per mol of photosynthetic iron than tem- perate species, despite their lower growth temperature (3 vs. 18 °C) and light intensity (30 vs. 40 μmol quanta·m2·s−1), which should have decreased photosynthetic rates. These unexpectedly high rates in the SO species are partly explained by their unusually large photosynthetic antennae, which are among the largest ever recorded in marine phytoplankton. Large antennae are disadvan- tageous at low light intensities because they increase excitation energy loss as heat, but this loss may be mitigated by the low SO temperatures. Such adaptations point to higher SO production rates than environmental conditions should otherwise permit, with implications for regional ecology and biogeochemistry. Southern Ocean phytoplankton isolates were grown under trace metal clean conditions in a low temperature incubator under low and high iron concentrations at sub saturating continuous light. The cultures were sampled for growth rates, intracellular iron and carbon concentrations, and photosynthetic rates and composition. |
author2 |
Strzepek, Robert, Dr (hasPrincipalInvestigator) Strzepek, Robert, Dr (pointOfContact) Institute for Marine and Antarctic Studies (IMAS), University of Tasmania (UTAS) (hasAssociationWith) |
format |
Dataset |
title |
Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton |
title_short |
Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton |
title_full |
Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton |
title_fullStr |
Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton |
title_full_unstemmed |
Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton |
title_sort |
photosynthetic adaptation to low iron, light, and temperature in southern ocean phytoplankton |
publisher |
University of Tasmania, Australia |
url |
https://researchdata.ands.org.au/photosynthetic-adaptation-low-ocean-phytoplankton/1424968 http://metadata.imas.utas.edu.au:/geonetwork/srv/en/metadata.show?uuid=6fbeb554-352b-4b79-b986-debfff6e3a01 https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/1810886116.full.pdf https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/pnas.1810886116.sapp.pdf |
op_coverage |
Spatial: northlimit=-42.7931625259; southlimit=-42.9849030764; westlimit=147.197753906; eastLimit=147.505371094 Temporal: From 2017-01-01 to 2019-01-23 |
long_lat |
ENVELOPE(147.197753906,147.505371094,-42.7931625259,-42.9849030764) |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Antarc* Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctica Southern Ocean |
op_source |
http://metadata.imas.utas.edu.au |
op_relation |
https://researchdata.ands.org.au/photosynthetic-adaptation-low-ocean-phytoplankton/1424968 6fbeb554-352b-4b79-b986-debfff6e3a01 http://metadata.imas.utas.edu.au:/geonetwork/srv/en/metadata.show?uuid=6fbeb554-352b-4b79-b986-debfff6e3a01 https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/1810886116.full.pdf https://data.imas.utas.edu.au/attachments/6fbeb554-352b-4b79-b986-debfff6e3a01/pnas.1810886116.sapp.pdf |
_version_ |
1766256105816588288 |