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Effects of CO2 concentration on a late summer surface sea ice community

Citation

McMinn, A and Muller, MN and Martin, A and Ugalde, SC and Lee, S and Castrisios, K and Ryan, KG, Effects of CO2 concentration on a late summer surface sea ice community, Marine Biology, 164, (4) Article 87. ISSN 0025-3162 (2017) [Refereed Article]

Copyright Statement

Copyright 2017 Springer-Verlag Berlin Heidelberg

DOI: doi:10.1007/s00227-017-3102-4

Abstract

Annual fast ice at Scott Base (Antarctica) in late summer contained a high biomass surface community of mixed phytoflagellates, dominated by the dinoflagellate, Polarella glacialis. At this time of the year, ice temperatures rise close to melting point and salinities drop to less than 20. At the same time, pH levels can rise above 9 and nutrients can become limiting. In January 2014, the sea ice microbial community from the top 30 cm of the ice was exposed to a gradient of pH and CO2 (5 treatments) that ranged from 8.87 to 7.12 and 5–215 µmol CO2 kg−1, respectively, and incubated in situ. While growth rates were reduced at the highest and lowest pH, the differences were not significant. Likewise, there were no significant differences in maximum quantum yield of PSII (Fv/Fm) or relative maximum electron transfer rates (rETRmax) among treatments. In a parallel experiment, a CO2 gradient of 26–230 µmol CO2 kg−1 (5 treatments) was tested, keeping pH constant. In this experiment, growth rates increased by approximately 40% with increasing CO2, although differences among treatments were not significant.. As in the previous experiment, there was no significant response in Fv/Fm or rETRmax. A synchronous grazing dilution experiment found grazing rates to be inconclusive These results suggest that the summer sea ice brine communities were not limited by in situ CO2 concentrations and were not adversely affected by pH values down to 7.1.

Item Details

Item Type:Refereed Article
Keywords:sea ice algae, CO2, Antarctica
Research Division:Biological Sciences
Research Group:Microbiology
Research Field:Microbial Ecology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:McMinn, A (Professor Andrew McMinn)
Author:Muller, MN (Dr Marius Muller)
Author:Martin, A (Dr Andrew Martin)
Author:Ugalde, SC (Ms Sarah Ugalde)
Author:Lee, S (Mr Shi Lee)
Author:Castrisios, K (Ms Katerina Castrisios)
ID Code:116493
Year Published:2017
Web of Science® Times Cited:1
Deposited By:Centre for Ecology and Biodiversity
Deposited On:2017-05-11
Last Modified:2017-09-13
Downloads:0

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