Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula

The Western Antarctic Peninsula (WAP), one of the most productive regions of the Southern Ocean, is currently undergoing rapid environmental changes such as ocean acidification (OA) and increased daily irradiances from enhanced surface‐water stratification. To assess the potential for future biologi...

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Published in:Limnology and Oceanography
Main Authors: Heiden, J.P., Völkner, C., Jones, E.M., van de Poll, W.H., Buma, A.G.J., Meredith, M.P., de Baar, H.J.W, Bischof, K., Wolf-Gladrow, D., Trimborn, S.
Format: Article in Journal/Newspaper
Language:English
Published: 2019
Subjects:
Online Access:https://www.vliz.be/imisdocs/publications/49/333849.pdf
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spelling ftnioz:oai:imis.nioz.nl:313345 2023-05-15T13:47:57+02:00 Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula Heiden, J.P. Völkner, C. Jones, E.M. van de Poll, W.H. Buma, A.G.J. Meredith, M.P. de Baar, H.J.W Bischof, K. Wolf-Gladrow, D. Trimborn, S. 2019 application/pdf https://www.vliz.be/imisdocs/publications/49/333849.pdf en eng info:eu-repo/semantics/altIdentifier/wos/000474301200021 info:eu-repo/semantics/altIdentifier/doi/doi.org/10.1002/lno.11147 https://www.vliz.be/imisdocs/publications/49/333849.pdf info:eu-repo/semantics/openAccess %3Ci%3ELimnol.+Oceanogr.+64%284%29%3C%2Fi%3E%3A+1716-1736.+%3Ca+href%3D%22https%3A%2F%2Fdx.doi.org%2F10.1002%2Flno.11147%22+target%3D%22_blank%22%3Ehttps%3A%2F%2Fdx.doi.org%2F10.1002%2Flno.11147%3C%2Fa%3E info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2019 ftnioz https://doi.org/10.1002/lno.11147 2022-05-01T14:10:40Z The Western Antarctic Peninsula (WAP), one of the most productive regions of the Southern Ocean, is currently undergoing rapid environmental changes such as ocean acidification (OA) and increased daily irradiances from enhanced surface‐water stratification. To assess the potential for future biological CO 2 sequestration of this region, we incubated a natural phytoplankton assemblage from Ryder Bay, WAP, under a range of pCO 2 levels (180 μatm, 450 μatm, and 1000 μatm) combined with either moderate or high natural solar radiation (MSR: 124 μmol photons m−2 s−1 and HSR: 435 μmol photons m−2 s−1, respectively). The initial and final phytoplankton communities were numerically dominated by the prymnesiophyte Phaeocystis Antarctica , with the single cells initially being predominant and solitary and colonial cells reaching similar high abundances by the end. Only when communities were grown under ambient pCO 2 in conjunction with HSR did the small diatom Fragilariopsis pseudonana outcompete P. Antarctica at the end of the experiment. Such positive light‐dependent growth response of the diatom was, however, dampened by OA. These changes in community composition were caused by an enhanced photosensitivity of diatoms, especially F. pseudonana>/i>, under OA and HSR, reducing thereby their competitiveness toward P. Antarctica . Moreover, community primary production (PP) of all treatments yielded similar high rates at the start and the end of the experiment, but with the main contributors shifting from initially large to small cells toward the end. Even though community PP of Ryder Bay phytoplankton was insensitive to the changes in light and CO 2 availability, the observed size‐dependent shift in productivity could, however, weaken the biological CO 2 sequestration potential of this region in the future. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica Ocean acidification Southern Ocean NIOZ Repository (Royal Netherlands Institute for Sea Research) Antarctic Antarctic Peninsula Ryder ENVELOPE(-68.333,-68.333,-67.566,-67.566) Ryder Bay ENVELOPE(-68.333,-68.333,-67.567,-67.567) Southern Ocean Limnology and Oceanography 64 4 1716 1736
institution Open Polar
collection NIOZ Repository (Royal Netherlands Institute for Sea Research)
op_collection_id ftnioz
language English
description The Western Antarctic Peninsula (WAP), one of the most productive regions of the Southern Ocean, is currently undergoing rapid environmental changes such as ocean acidification (OA) and increased daily irradiances from enhanced surface‐water stratification. To assess the potential for future biological CO 2 sequestration of this region, we incubated a natural phytoplankton assemblage from Ryder Bay, WAP, under a range of pCO 2 levels (180 μatm, 450 μatm, and 1000 μatm) combined with either moderate or high natural solar radiation (MSR: 124 μmol photons m−2 s−1 and HSR: 435 μmol photons m−2 s−1, respectively). The initial and final phytoplankton communities were numerically dominated by the prymnesiophyte Phaeocystis Antarctica , with the single cells initially being predominant and solitary and colonial cells reaching similar high abundances by the end. Only when communities were grown under ambient pCO 2 in conjunction with HSR did the small diatom Fragilariopsis pseudonana outcompete P. Antarctica at the end of the experiment. Such positive light‐dependent growth response of the diatom was, however, dampened by OA. These changes in community composition were caused by an enhanced photosensitivity of diatoms, especially F. pseudonana>/i>, under OA and HSR, reducing thereby their competitiveness toward P. Antarctica . Moreover, community primary production (PP) of all treatments yielded similar high rates at the start and the end of the experiment, but with the main contributors shifting from initially large to small cells toward the end. Even though community PP of Ryder Bay phytoplankton was insensitive to the changes in light and CO 2 availability, the observed size‐dependent shift in productivity could, however, weaken the biological CO 2 sequestration potential of this region in the future.
format Article in Journal/Newspaper
author Heiden, J.P.
Völkner, C.
Jones, E.M.
van de Poll, W.H.
Buma, A.G.J.
Meredith, M.P.
de Baar, H.J.W
Bischof, K.
Wolf-Gladrow, D.
Trimborn, S.
spellingShingle Heiden, J.P.
Völkner, C.
Jones, E.M.
van de Poll, W.H.
Buma, A.G.J.
Meredith, M.P.
de Baar, H.J.W
Bischof, K.
Wolf-Gladrow, D.
Trimborn, S.
Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula
author_facet Heiden, J.P.
Völkner, C.
Jones, E.M.
van de Poll, W.H.
Buma, A.G.J.
Meredith, M.P.
de Baar, H.J.W
Bischof, K.
Wolf-Gladrow, D.
Trimborn, S.
author_sort Heiden, J.P.
title Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula
title_short Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula
title_full Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula
title_fullStr Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula
title_full_unstemmed Impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal Western Antarctic Peninsula
title_sort impact of ocean acidification and high solar radiation on productivity and species composition of a late summer phytoplankton community of the coastal western antarctic peninsula
publishDate 2019
url https://www.vliz.be/imisdocs/publications/49/333849.pdf
long_lat ENVELOPE(-68.333,-68.333,-67.566,-67.566)
ENVELOPE(-68.333,-68.333,-67.567,-67.567)
geographic Antarctic
Antarctic Peninsula
Ryder
Ryder Bay
Southern Ocean
geographic_facet Antarctic
Antarctic Peninsula
Ryder
Ryder Bay
Southern Ocean
genre Antarc*
Antarctic
Antarctic Peninsula
Antarctica
Ocean acidification
Southern Ocean
genre_facet Antarc*
Antarctic
Antarctic Peninsula
Antarctica
Ocean acidification
Southern Ocean
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container_title Limnology and Oceanography
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