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Physiological responses of a Southern Ocean diatom to complex future ocean conditions


Boyd, PW and Dillingham, PW and McGraw, CM and Armstrong, EA and Cornwall, CE and Feng, Y-y and Hurd, CL and Gault-Ringold, M and Roleda, MY and Timmins-Schiffman, E and Nunn, BL, Physiological responses of a Southern Ocean diatom to complex future ocean conditions, Nature Climate Change, 6 pp. 207-213. ISSN 1758-678X (2016) [Refereed Article]

Copyright Statement

Copyright 2015 Macmillan Publishers Limited

DOI: doi:10.1038/NCLIMATE2811


A changing climate is altering many ocean properties that consequently will modify marine productivity. Previous phytoplankton manipulation studies have focused on individual or subsets of these properties. Here, we investigate the cumulative effects of multi-faceted change on a subantarctic diatom Pseudonitzschia multiseries by concurrently manipulating five stressors (light/nutrients/CO2/temperature/iron) that primarily control its physiology, and explore underlying reasons for altered physiological performance. Climate change enhances diatom growth mainly owing to warming and iron enrichment, and both properties decrease cellular nutrient quotas, partially offsetting any effects of decreased nutrient supply by 2100. Physiological diagnostics and comparative proteomics demonstrate the joint importance of individual and interactive effects of temperature and iron, and reveal biased future predictions from experimental outcomes when only a subset of multi-stressors is considered. Our findings for subantarctic waters illustrate how composite regional studies are needed to provide accurate global projections of future shifts in productivity and distinguish underlying species-specific physiological mechanisms.

Item Details

Item Type:Refereed Article
Keywords:climate change, temperature, ocean acidification, iron, diatom, nitrogen, experimental design
Research Division:Environmental Sciences
Research Group:Climate change impacts and adaptation
Research Field:Ecological impacts of climate change and ecological adaptation
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Adaptation to climate change
Objective Field:Ecosystem adaptation to climate change
UTAS Author:Boyd, PW (Professor Philip Boyd)
UTAS Author:Cornwall, CE (Dr Chris Cornwall)
UTAS Author:Hurd, CL (Professor Catriona Hurd)
UTAS Author:Gault-Ringold, M (Dr Melanie East)
ID Code:104205
Year Published:2016
Web of Science® Times Cited:116
Deposited By:Ecology and Biodiversity
Deposited On:2015-11-04
Last Modified:2018-04-09

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