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| Main Authors: | , , , , , , , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2017
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| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.878255 |
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| _version_ | 1867171000024563712 |
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| author | Hoppe, Clara Jule Marie Schuback, Nina Semeniuk, David M Giesbrecht, Karina E Mol, Jacoba Thomas, Helmuth Maldonado, Maria T Rost, Björn Varela, Diana E Tortell, Philippe Daniel |
| author_facet | Hoppe, Clara Jule Marie Schuback, Nina Semeniuk, David M Giesbrecht, Karina E Mol, Jacoba Thomas, Helmuth Maldonado, Maria T Rost, Björn Varela, Diana E Tortell, Philippe Daniel |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Arctic Ocean is a region particularly prone to on-going ocean acidification (OA) and climate-driven changes. The influence of these changes on Arctic phytoplankton assemblages, however, remains poorly understood. In order to understand how OA and enhanced irradiances (e.g. resulting from sea-ice retreat) will alter the species composition, primary production and ecophysiology of Arctic phytoplankton, we conducted an incubation experiment to investigate the effects of OA and enhanced irradiance levels on an assemblage from Baffin Bay (71°N, 68°W). Seawater was collected from just below the deep Chl a maximum, and the resident phytoplankton were exposed to 380 and 1000 µatm pCO2 at both 15% and 35% incident irradiance. On-deck incubations, in which temperatures were 6°C above in situ conditions, were monitored for phytoplankton growth, biomass stoichiometry, net primary production, photo-physiology and taxonomic composition. During the 8-day experiment, taxonomic diversity decreased and the diatom Chaetoceros socialis became increasingly dominant irrespective of light or CO2 levels. We found no statistically significant effects from either higher CO2 or light on physiological properties of phytoplankton during the experiment. We did, however, observe an initial 2-day stress response in all treatments, and slight photo-physiological responses to higher CO2 and light during the first five days of the incubation. Our results thus indicate high resistance of Arctic phytoplankton to OA and enhanced irradiance levels, challenging the commonly predicted stimulatory effects of enhanced CO2 and light availability for primary production. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_878255 |
| institution | PANGAEA |
| language | en |
| publishDate | 2017 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Resistance of an Arctic phytoplankton assemblages to ocean acidification and high irradiance, link to supplement in MS Excel format Hoppe, Clara Jule Marie Schuback, Nina Semeniuk, David M Giesbrecht, Karina E Mol, Jacoba Thomas, Helmuth Maldonado, Maria T Rost, Björn Varela, Diana E Tortell, Philippe Daniel The Arctic Ocean is a region particularly prone to on-going ocean acidification (OA) and climate-driven changes. The influence of these changes on Arctic phytoplankton assemblages, however, remains poorly understood. In order to understand how OA and enhanced irradiances (e.g. resulting from sea-ice retreat) will alter the species composition, primary production and ecophysiology of Arctic phytoplankton, we conducted an incubation experiment to investigate the effects of OA and enhanced irradiance levels on an assemblage from Baffin Bay (71°N, 68°W). Seawater was collected from just below the deep Chl a maximum, and the resident phytoplankton were exposed to 380 and 1000 µatm pCO2 at both 15% and 35% incident irradiance. On-deck incubations, in which temperatures were 6°C above in situ conditions, were monitored for phytoplankton growth, biomass stoichiometry, net primary production, photo-physiology and taxonomic composition. During the 8-day experiment, taxonomic diversity decreased and the diatom Chaetoceros socialis became increasingly dominant irrespective of light or CO2 levels. We found no statistically significant effects from either higher CO2 or light on physiological properties of phytoplankton during the experiment. We did, however, observe an initial 2-day stress response in all treatments, and slight photo-physiological responses to higher CO2 and light during the first five days of the incubation. Our results thus indicate high resistance of Arctic phytoplankton to OA and enhanced irradiance levels, challenging the commonly predicted stimulatory effects of enhanced CO2 and light availability for primary production. |
| title | Resistance of an Arctic phytoplankton assemblages to ocean acidification and high irradiance, link to supplement in MS Excel format |
| topic | |
| url | https://doi.org/10.1594/PANGAEA.878255 |