Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification
It is largely unknown how rising atmospheric COconcentrations 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 p...
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ftawi:oai:epic.awi.de:42775 2024-09-15T17:41:09+00:00 Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification Heiden, Jasmin Bischof, Kai Trimborn, Scarlett 2016-12-15 application/pdf https://epic.awi.de/id/eprint/42775/ https://epic.awi.de/id/eprint/42775/1/fmars-03-00260.pdf http://journal.frontiersin.org/article/10.3389/fmars.2016.00260/full https://hdl.handle.net/10013/epic.49365 https://hdl.handle.net/10013/epic.49365.d001 unknown Frontiers Media S.A. https://epic.awi.de/id/eprint/42775/1/fmars-03-00260.pdf https://hdl.handle.net/10013/epic.49365.d001 Heiden, J. , Bischof, K. and Trimborn, S. orcid:0000-0003-1434-9927 (2016) Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification , Frontiers in Marine Science, 3 (260), pp. 1-17 . doi:10.3389/fmars.2016.00260 <https://doi.org/10.3389/fmars.2016.00260> , hdl:10013/epic.49365 EPIC3Frontiers in Marine Science, Frontiers Media S.A., 3(260), pp. 1-17 Article isiRev 2016 ftawi https://doi.org/10.3389/fmars.2016.00260 2024-06-24T04:16:35Z It is largely unknown how rising atmospheric COconcentrations 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 absolute electron transport rates 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 Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Frontiers in Marine Science 3 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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description |
It is largely unknown how rising atmospheric COconcentrations 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 absolute electron transport rates 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 |
Heiden, Jasmin Bischof, Kai Trimborn, Scarlett |
spellingShingle |
Heiden, Jasmin Bischof, Kai Trimborn, Scarlett Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification |
author_facet |
Heiden, Jasmin Bischof, Kai Trimborn, Scarlett |
author_sort |
Heiden, Jasmin |
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://epic.awi.de/id/eprint/42775/ https://epic.awi.de/id/eprint/42775/1/fmars-03-00260.pdf http://journal.frontiersin.org/article/10.3389/fmars.2016.00260/full https://hdl.handle.net/10013/epic.49365 https://hdl.handle.net/10013/epic.49365.d001 |
genre |
Antarc* Antarctic Southern Ocean |
genre_facet |
Antarc* Antarctic Southern Ocean |
op_source |
EPIC3Frontiers in Marine Science, Frontiers Media S.A., 3(260), pp. 1-17 |
op_relation |
https://epic.awi.de/id/eprint/42775/1/fmars-03-00260.pdf https://hdl.handle.net/10013/epic.49365.d001 Heiden, J. , Bischof, K. and Trimborn, S. orcid:0000-0003-1434-9927 (2016) Light Intensity Modulates the Response of Two Antarctic Diatom Species to Ocean Acidification , Frontiers in Marine Science, 3 (260), pp. 1-17 . doi:10.3389/fmars.2016.00260 <https://doi.org/10.3389/fmars.2016.00260> , hdl:10013/epic.49365 |
op_doi |
https://doi.org/10.3389/fmars.2016.00260 |
container_title |
Frontiers in Marine Science |
container_volume |
3 |
_version_ |
1810487272830664704 |