The role of CO₂ variability and exposure time for biological impacts of ocean acidification

Shaw, Emily C., Munday, Philip L., and McNeil, Ben I. (2013) The role of CO₂ variability and exposure time for biological impacts of ocean acidification. Geophysical Research Letters, 40 (17). pp. 4685-4688.

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Biological impacts of ocean acidification have mostly been studied using future levels of CO₂ without consideration of natural variability or how this modulates both duration and magnitude of CO₂ exposure. Here we combine results from laboratory studies on coral reef fish with diurnal in situ CO₂ data from a shallow coral reef, to demonstrate how natural variability alters exposure times for marine organisms under increasingly high-CO₂ conditions. Large in situ CO₂ variability already results in exposure of coral reef fish to short-term CO₂ levels higher than laboratory-derived critical CO₂ levels (~600 μatm). However, we suggest that the in situ exposure time is presently insufficient to induce negative effects observed in laboratory studies. Our results suggest that both exposure time and the magnitude of CO₂ levels will be important in determining the response of organisms to future ocean acidification, where both will increase markedly with future increases in CO₂.

Item ID: 30211
Item Type: Article (Research - C1)
ISSN: 1944-8007
Keywords: ocean acidification, natural variability, exposure time, coral reefs, fish
Funders: University of New South Wales (UNSW), CSIRO Wealth from Oceans Flagship, Australian Research Council (ARC) , ARC Centre of Excellence for Coral Reef Studies, James Cook University (JCU)
Projects and Grants: ARC Queen Elizabeth II Fellowship ARC/DP0880815
Date Deposited: 13 Nov 2013 05:36
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
96 ENVIRONMENT > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified @ 50%
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