Light intensity modulates the response of two Antarctic diatom species to ocean acidification
It is largely unknown how rising atmospheric CO2 concentrations and changes in the upper mixed layer depth, with its subsequent effects on light availability will affect phytoplankton physiology in the Southern Ocean. Linking seasonal variations in the availability of CO2 and light to abundances and...
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ftdoajarticles:oai:doaj.org/article:9d4c416f8e224766a692450f69492c40 2023-05-15T13:57:29+02:00 Light intensity modulates the response of two Antarctic diatom species to ocean acidification Jasmin Pascale Heiden Kai Bischof Scarlett Trimborn 2016-12-01T00:00:00Z https://doi.org/10.3389/fmars.2016.00260 https://doaj.org/article/9d4c416f8e224766a692450f69492c40 EN eng Frontiers Media S.A. http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00260/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00260 https://doaj.org/article/9d4c416f8e224766a692450f69492c40 Frontiers in Marine Science, Vol 3 (2016) Climate Change Growth Phytoplankton Season carbon fixation CO2 Science Q General. Including nature conservation geographical distribution QH1-199.5 article 2016 ftdoajarticles https://doi.org/10.3389/fmars.2016.00260 2022-12-31T12:18:10Z It is largely unknown how rising atmospheric CO2 concentrations and changes in the upper mixed layer depth, with its subsequent effects on light availability will affect phytoplankton physiology in the Southern Ocean. Linking seasonal variations in the availability of CO2 and light to abundances and physiological traits of key phytoplankton species could aid to understand their abilities to acclimate to predicted future climatic conditions. To investigate the combined effects of CO2 and light on two ecologically relevant Antarctic diatoms (Fragilariopsis curta and Odontella weisflogii) a matrix of three light intensities (LL=20, ML=200, HL=500 µmol photons m-2 s-1) and three pCO2 levels (low=180, ambient=380, high=1000 µatm) was applied assessing their effects on growth, particulate organic carbon (POC) fixation and photophysiology. Under ambient pCO2, POC production rates were highest already at low light in Fragilariopsis, indicating saturation of photosynthesis, while in Odontella highest rates were only reached at medium irradiances. In both species ocean acidification did not stimulate, but rather inhibited, growth and POC production under low and medium light. This effect was, however, amended under high growth irradiances. Low pCO2 levels inhibited growth and POC production in both species at low and medium light, and further decreased absETRs under high light. Our results suggest that Southern Ocean diatoms were sensitive to changes in pCO2, showing species-specific responses, which were further modulated by light intensity. The two diatom species represent distinct ecotypes and revealed discrete physiological traits that matched their seasonal occurrence with the related physical conditions in Antarctic coastal waters. Article in Journal/Newspaper Antarc* Antarctic Ocean acidification Southern Ocean Directory of Open Access Journals: DOAJ Articles Antarctic Southern Ocean Frontiers in Marine Science 3 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Climate Change Growth Phytoplankton Season carbon fixation CO2 Science Q General. Including nature conservation geographical distribution QH1-199.5 |
spellingShingle |
Climate Change Growth Phytoplankton Season carbon fixation CO2 Science Q General. Including nature conservation geographical distribution QH1-199.5 Jasmin Pascale Heiden Kai Bischof Scarlett Trimborn Light intensity modulates the response of two Antarctic diatom species to ocean acidification |
topic_facet |
Climate Change Growth Phytoplankton Season carbon fixation CO2 Science Q General. Including nature conservation geographical distribution QH1-199.5 |
description |
It is largely unknown how rising atmospheric CO2 concentrations and changes in the upper mixed layer depth, with its subsequent effects on light availability will affect phytoplankton physiology in the Southern Ocean. Linking seasonal variations in the availability of CO2 and light to abundances and physiological traits of key phytoplankton species could aid to understand their abilities to acclimate to predicted future climatic conditions. To investigate the combined effects of CO2 and light on two ecologically relevant Antarctic diatoms (Fragilariopsis curta and Odontella weisflogii) a matrix of three light intensities (LL=20, ML=200, HL=500 µmol photons m-2 s-1) and three pCO2 levels (low=180, ambient=380, high=1000 µatm) was applied assessing their effects on growth, particulate organic carbon (POC) fixation and photophysiology. Under ambient pCO2, POC production rates were highest already at low light in Fragilariopsis, indicating saturation of photosynthesis, while in Odontella highest rates were only reached at medium irradiances. In both species ocean acidification did not stimulate, but rather inhibited, growth and POC production under low and medium light. This effect was, however, amended under high growth irradiances. Low pCO2 levels inhibited growth and POC production in both species at low and medium light, and further decreased absETRs under high light. Our results suggest that Southern Ocean diatoms were sensitive to changes in pCO2, showing species-specific responses, which were further modulated by light intensity. The two diatom species represent distinct ecotypes and revealed discrete physiological traits that matched their seasonal occurrence with the related physical conditions in Antarctic coastal waters. |
format |
Article in Journal/Newspaper |
author |
Jasmin Pascale Heiden Kai Bischof Scarlett Trimborn |
author_facet |
Jasmin Pascale Heiden Kai Bischof Scarlett Trimborn |
author_sort |
Jasmin Pascale Heiden |
title |
Light intensity modulates the response of two Antarctic diatom species to ocean acidification |
title_short |
Light intensity modulates the response of two Antarctic diatom species to ocean acidification |
title_full |
Light intensity modulates the response of two Antarctic diatom species to ocean acidification |
title_fullStr |
Light intensity modulates the response of two Antarctic diatom species to ocean acidification |
title_full_unstemmed |
Light intensity modulates the response of two Antarctic diatom species to ocean acidification |
title_sort |
light intensity modulates the response of two antarctic diatom species to ocean acidification |
publisher |
Frontiers Media S.A. |
publishDate |
2016 |
url |
https://doi.org/10.3389/fmars.2016.00260 https://doaj.org/article/9d4c416f8e224766a692450f69492c40 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Ocean acidification Southern Ocean |
genre_facet |
Antarc* Antarctic Ocean acidification Southern Ocean |
op_source |
Frontiers in Marine Science, Vol 3 (2016) |
op_relation |
http://journal.frontiersin.org/Journal/10.3389/fmars.2016.00260/full https://doaj.org/toc/2296-7745 2296-7745 doi:10.3389/fmars.2016.00260 https://doaj.org/article/9d4c416f8e224766a692450f69492c40 |
op_doi |
https://doi.org/10.3389/fmars.2016.00260 |
container_title |
Frontiers in Marine Science |
container_volume |
3 |
_version_ |
1766265154885910528 |