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Rapid DMSP production by an Antarctic phytoplankton community exposed to natural surface irradiances in late spring

Citation

Vance, TR and Davidson, AT and Thomson, PG and Levasseur, M and Lizotte, M and Curran, MAJ and Jones, GB, Rapid DMSP production by an Antarctic phytoplankton community exposed to natural surface irradiances in late spring, Aquatic Microbial Ecology, 71, (2) pp. 117-129. ISSN 0948-3055 (2013) [Refereed Article]


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Copyright Statement

Copyright 2013 Inter-Research

DOI: doi:10.3354/ame01670

Abstract

Natural marine microbial communities sourced from under fast ice at an Antarctic coastal site were incubated in tanks under differently attenuated natural sunlight for 2 wk in late spring (Expt 1) and early summer (Expt 2). In the 18 d period between the 2 sampling episodes, the ice edge retreated from 10 to within 1.5 km of the sampling site, and the fast ice began to break up. Expt 1 rapidly produced significant quantities of total DMSP (DMSPt) with concentrations increasing from 16.6 nmol l-1 to 192.7-204.5 nmol l-1 in 2 d. We believe this is the largest observed increase in DMSPt in a semi-natural community over this time frame. Abundances of Phaeocystis antarctica increased significantly during this initial period, while other phytoplankton species/groups remained stable. DMSPt concentrations then declined at rates averaging 39.2-50.0 nmol l-1 d-1 between Days 2 and 4. No major DMSPt production event occurred during Expt 2 despite strong community similarities. Sea ice breakout exposes phytoplankton to significant light-related oxidative stress, and these results suggest the rapid production of DMSPt during Expt 1 was due to the initiation of anti-oxidant mechanisms by a low-light-acclimated community in response to solar radiation stress. DMS concentrations remained comparatively low throughout Expt 1, suggesting oxidation of DMSP to products other than DMS. Rapid sea ice breakout in coastal regions of Antarctica may result in similar fast DMSP production events during spring.

Item Details

Item Type:Refereed Article
Keywords:DMSP, Light Stress, Antarctica
Research Division:Biological Sciences
Research Group:Microbiology
Research Field:Microbial Ecology
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Effects of Climate Change and Variability on Antarctic and Sub-Antarctic Environments (excl. Social Impacts)
Author:Vance, TR (Dr Tessa Vance)
Author:Davidson, AT (Dr Andrew Davidson)
Author:Curran, MAJ (Dr Mark Curran)
ID Code:89540
Year Published:2013
Web of Science® Times Cited:5
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2014-03-06
Last Modified:2014-12-18
Downloads:0

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