Journal article
Responses of the diatom Asterionellopsis glacialis to increasing sea water CO2 concentrations and turbulence
Marine Ecology - Progress Series, Vol.589, pp.33-44
23/02/2018
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Abstract
Greenhouse gas emissions, such as carbon dioxide (CO2), lead to enhanced atmospheric and surface ocean temperatures. At the same time, CO2 equilibrates between the atmosphere and the surface ocean, resulting in lower seawater pH. The changes in physical and chemical properties of the ocean potentially affect marine primary producers in various ways. A number of researches have addressed the effects of ocean acidification on marine phytoplankton. However, phytoplankton responses to combined effects are still poorly understood. Here, we chose the cosmopolitan chain-forming diatom Asterionellopsis glacialis to assess the combined effect of ocean acidification and carbonation (~420 to 2800 µatm) and water motion on its physiological rates. At current CO2 levels, we observed an increase in growth rates of A. glacialis accompanied by a prevalence of longer chains (>6 cells) under enhanced water motion. However, at increasing CO2 levels (up to ~2800 µatm) and decreasing pH values, enhanced water motion significantly decreased growth rates, chain length and organic matter production of A. glacialis. Thus, our study suggests that even though A. glacialis benefited from enhanced water motion at present CO2 concentration, at higher CO2 levels, the more unstable environment magnified the stress caused by acidification. If in the future the ocean surface layer will be more frequently exposed to storm and wind events, then phytoplankton communities might be more sensitive to lower pH, with potential consequences for community composition and productivity.
Details
- Title
- Responses of the diatom Asterionellopsis glacialis to increasing sea water CO2 concentrations and turbulence
- Creators
- Francesca Gallo - Universidade dos AçoresKai G Schulz - Southern Cross UniversityEduardo B Azevedo - Universidade dos AçoresJoão Madruga - Universidade dos AçoresJoana Barcelos e Ramos - Universidade dos Açores
- Publication Details
- Marine Ecology - Progress Series, Vol.589, pp.33-44
- Publisher
- Inter-Research
- Grant note
- This research was supported by project ROPICO2 (Responses of phytoplankton communities from the Subtropical North Atlantic Gyre to increasing CO2 concentrations and consequent carbonate chemistry changes in the ocean, Azores, PTDC/AAC-CLI/112735/2009) and the Azorean Regional Science Fund (M3.1.7/ F/025/2011; M3.1.7/F/003/2010).
- Identifiers
- 991012927091702368
- Copyright
- © Inter-Research 2018 · www.int-res.com
- Academic Unit
- School of Environment, Science and Engineering; Science; Centre for Coastal Biogeochemistry; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article