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Title

Temperature effects on oxygen thresholds for hypoxia in marine benthic organisms

AuthorsVaquer-Sunyer, Raquel CSIC ORCID ; Duarte, Carlos M. CSIC ORCID
KeywordsGlobal warming
Benthic communities
Hypoxia
Impacts
Oxygen
Issue Date2-Nov-2010
PublisherBlackwell Publishing
CitationGlobal Change Biology (2011)
AbstractThe effect of warming on the oxygen requirements and the survival of benthic organisms under hypoxia was tested using a meta-analysis of published results of experiments evaluating the effects of temperature on the median lethal time and median lethal concentration of benthic macrofauna under hypoxia. The meta-analysis confirmed that survival times under hypoxia were reduced by on average 74% and that median lethal concentration increased by on average 16% when marine benthic organisms were exposed to warmer temperatures. Warming reduced survival times of marine benthic macrofauna under hypoxia by a median of 3.95±1.67 h °C−1 and increased the oxygen thresholds for hypoxia-driven mortality by a median of 1.02±0.15% saturation °C−1 or 0.07±0.01 mg O2 L−1 °C−1. The corresponding Q10 values averaged 3.01±0.29 for the median survival time and 2.09±0.20 for the median lethal oxygen concentration. Use of these Q10 values predicts that the 4 °C warming expected during the 21st century will lead to survival times 35.6% lower under hypoxia and that the threshold oxygen concentrations for high mortality to occur will increase by, on average, 25.5% if bottom water temperature increased by 4 °C. Hence, ocean warming is expected to increase the vulnerability of benthic macrofauna to reduced oxygen concentrations and expand the area of coastal ecosystems affected by hypoxia.
Publisher version (URL)http://dx.doi.org/10.1111/j.1365-2486.2010.02343.x
URIhttp://hdl.handle.net/10261/30809
DOI10.1111/j.1365-2486.2010.02343.x
ISSN1354-1013
Appears in Collections:(IMEDEA) Artículos

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