Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica
We investigated the effects of temperature and CO 2 variation on the growth and elemental composition of cultures of the diatom Pseudo-nitzschia subcurvata and the prymnesiophyte Phaeocystis antarctica , two ecologically dominant phytoplankton species isolated from the Ross Sea, Antarctica. To obtai...
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ftdoajarticles:oai:doaj.org/article:fc667b0b9a32401fb39c10c6296579ea 2023-05-15T13:45:05+02:00 Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica Z. Zhu P. Qu J. Gale F. Fu D. A. Hutchins 2017-11-01T00:00:00Z https://doi.org/10.5194/bg-14-5281-2017 https://doaj.org/article/fc667b0b9a32401fb39c10c6296579ea EN eng Copernicus Publications https://www.biogeosciences.net/14/5281/2017/bg-14-5281-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-14-5281-2017 1726-4170 1726-4189 https://doaj.org/article/fc667b0b9a32401fb39c10c6296579ea Biogeosciences, Vol 14, Pp 5281-5295 (2017) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2017 ftdoajarticles https://doi.org/10.5194/bg-14-5281-2017 2022-12-31T14:06:57Z We investigated the effects of temperature and CO 2 variation on the growth and elemental composition of cultures of the diatom Pseudo-nitzschia subcurvata and the prymnesiophyte Phaeocystis antarctica , two ecologically dominant phytoplankton species isolated from the Ross Sea, Antarctica. To obtain thermal functional response curves, cultures were grown across a range of temperatures from 0 to 14 °C. In addition, a co-culturing experiment examined the relative abundance of both species at 0 and 6 °C. CO 2 functional response curves were conducted from 100 to 1730 ppm at 2 and 8 °C to test for interactive effects between the two variables. The growth of both phytoplankton was significantly affected by temperature increase, but with different trends. Growth rates of P. subcurvata increased with temperature from 0 °C to maximum levels at 8 °C, while the growth rates of P. antarctica only increased from 0 to 2 °C. The maximum thermal limits of P. subcurvata and P. antarctica where growth stopped completely were 14 and 10 °C, respectively. Although P. subcurvata outgrew P. antarctica at both temperatures in the co-incubation experiment, this happened much faster at 6 than at 0 °C. For P. subcurvata , there was a significant interactive effect in which the warmer temperature decreased the CO 2 half-saturation constant for growth, but this was not the case for P. antarctica . The growth rates of both species increased with CO 2 increases up to 425 ppm, and in contrast to significant effects of temperature, the effects of CO 2 increase on their elemental composition were minimal. Our results suggest that future warming may be more favorable to the diatom than to the prymnesiophyte, while CO 2 increases may not be a major factor in future competitive interactions between Pseudo-nitzschia subcurvata and Phaeocystis antarctica in the Ross Sea. Article in Journal/Newspaper Antarc* Antarctica Ross Sea Directory of Open Access Journals: DOAJ Articles Ross Sea Biogeosciences 14 23 5281 5295 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 Z. Zhu P. Qu J. Gale F. Fu D. A. Hutchins Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
We investigated the effects of temperature and CO 2 variation on the growth and elemental composition of cultures of the diatom Pseudo-nitzschia subcurvata and the prymnesiophyte Phaeocystis antarctica , two ecologically dominant phytoplankton species isolated from the Ross Sea, Antarctica. To obtain thermal functional response curves, cultures were grown across a range of temperatures from 0 to 14 °C. In addition, a co-culturing experiment examined the relative abundance of both species at 0 and 6 °C. CO 2 functional response curves were conducted from 100 to 1730 ppm at 2 and 8 °C to test for interactive effects between the two variables. The growth of both phytoplankton was significantly affected by temperature increase, but with different trends. Growth rates of P. subcurvata increased with temperature from 0 °C to maximum levels at 8 °C, while the growth rates of P. antarctica only increased from 0 to 2 °C. The maximum thermal limits of P. subcurvata and P. antarctica where growth stopped completely were 14 and 10 °C, respectively. Although P. subcurvata outgrew P. antarctica at both temperatures in the co-incubation experiment, this happened much faster at 6 than at 0 °C. For P. subcurvata , there was a significant interactive effect in which the warmer temperature decreased the CO 2 half-saturation constant for growth, but this was not the case for P. antarctica . The growth rates of both species increased with CO 2 increases up to 425 ppm, and in contrast to significant effects of temperature, the effects of CO 2 increase on their elemental composition were minimal. Our results suggest that future warming may be more favorable to the diatom than to the prymnesiophyte, while CO 2 increases may not be a major factor in future competitive interactions between Pseudo-nitzschia subcurvata and Phaeocystis antarctica in the Ross Sea. |
format |
Article in Journal/Newspaper |
author |
Z. Zhu P. Qu J. Gale F. Fu D. A. Hutchins |
author_facet |
Z. Zhu P. Qu J. Gale F. Fu D. A. Hutchins |
author_sort |
Z. Zhu |
title |
Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica |
title_short |
Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica |
title_full |
Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica |
title_fullStr |
Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica |
title_full_unstemmed |
Individual and interactive effects of warming and CO 2 on Pseudo-nitzschia subcurvata and Phaeocystis antarctica , two dominant phytoplankton from the Ross Sea, Antarctica |
title_sort |
individual and interactive effects of warming and co 2 on pseudo-nitzschia subcurvata and phaeocystis antarctica , two dominant phytoplankton from the ross sea, antarctica |
publisher |
Copernicus Publications |
publishDate |
2017 |
url |
https://doi.org/10.5194/bg-14-5281-2017 https://doaj.org/article/fc667b0b9a32401fb39c10c6296579ea |
geographic |
Ross Sea |
geographic_facet |
Ross Sea |
genre |
Antarc* Antarctica Ross Sea |
genre_facet |
Antarc* Antarctica Ross Sea |
op_source |
Biogeosciences, Vol 14, Pp 5281-5295 (2017) |
op_relation |
https://www.biogeosciences.net/14/5281/2017/bg-14-5281-2017.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-14-5281-2017 1726-4170 1726-4189 https://doaj.org/article/fc667b0b9a32401fb39c10c6296579ea |
op_doi |
https://doi.org/10.5194/bg-14-5281-2017 |
container_title |
Biogeosciences |
container_volume |
14 |
container_issue |
23 |
container_start_page |
5281 |
op_container_end_page |
5295 |
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1766212524192038912 |