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Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice
Citation
Castrisios, K and Martin, A and Muller, MN and Kennedy, F and McMinn, A and Ryan, KG, Response of Antarctic sea-ice algae to an experimental decrease in pH: a preliminary analysis from chlorophyll fluorescence imaging of melting ice, Polar Research, 37 Article 1438696. ISSN 0800-0395 (2018) [Refereed Article]
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Copyright Statement
Copyright 2018 The Authors. Licensed under Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) https://creativecommons.org/licenses/by-nc/4.0/
DOI: doi:10.1080/17518369.2018.1438696
Abstract
Microorganisms confined to annual sea ice in the Southern Ocean are exposed to highly variable oxygen and carbonate chemistry dynamics because of the seasonal increase in biomass and limited exchange with the underlying water column. For sea-ice algae, physiological stress is likely to be exacerbated when the ice melts; however, variation in carbonate speciation has rarely been monitored during this important state-transition. Using pulse amplitude modulated fluorometry (Imaging-PAM, Walz), we documented in situ changes in the maximum quantum yield of photosystem II ( F v / F m ) of sea-ice algae melting out into seawater with initial pH values ranging from 7.66 to 6.39. Although the process of ice-melt elevated seawater pH by 0.2–0.55 units, we observed a decrease in F v / F m between 0.02 and 0.06 for each unit drop in pH during real-time fluorescence imaging. These results are considered preliminary but provide context for including carbonate chemistry monitoring in the design of future sea ice state-transition experiments. Imaging-PAM is a reliable technology for determining F v / F m , but is of limited use for obtaining additional photosynthetic parameters when imaging melting ice.
Item Details
Item Type: | Refereed Article |
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Keywords: | ice algae pH, Antarctica, imaging-PAM, photophysiology, carbonate chemistry |
Research Division: | Biological Sciences |
Research Group: | Ecology |
Research Field: | Marine and estuarine ecology (incl. marine ichthyology) |
Objective Division: | Environmental Management |
Objective Group: | Management of Antarctic and Southern Ocean environments |
Objective Field: | Biodiversity in Antarctic and Southern Ocean environments |
UTAS Author: | Castrisios, K (Miss Katerina Castrisios) |
UTAS Author: | Martin, A (Dr Andrew Martin) |
UTAS Author: | Kennedy, F (Dr Fraser Kennedy) |
UTAS Author: | McMinn, A (Professor Andrew McMinn) |
ID Code: | 130915 |
Year Published: | 2018 |
Web of Science® Times Cited: | 6 |
Deposited By: | Ecology and Biodiversity |
Deposited On: | 2019-02-20 |
Last Modified: | 2019-03-22 |
Downloads: | 92 View Download Statistics |
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