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Marine Ecology Progress Series

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MEPS 587:73-80 (2018)  -  DOI:

Community-level sensitivity of a calcifying ecosystem to acute in situ CO2 enrichment

Heidi L. Burdett1,2,*, Gabriela Perna3,4, Lucy McKay5,6, Gemma Broomhead5, Nicholas A. Kamenos4

1Lyell Centre for Earth and Marine Science and Technology, Edinburgh EH14 4AP, UK
2School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh EH14 4AS, UK
3School of Geographical and Earth Science, University of Glasgow, Glasgow G12 8QQ, UK
4King Abdullah University for Science and Technology, Thuwal 23955, Saudi Arabia
5School of Earth & Environmental Sciences, University of St Andrews, St Andrews KY16 9AL, UK
6School of Civil and Environmental Engineering, University of Strathclyde, Glasgow G1 1XJ, UK
*Corresponding author:

ABSTRACT: The rate of change in ocean carbonate chemistry is a vital determinant in the magnitude of effects observed. Benthic marine ecosystems are facing an increasing risk of acute CO2 exposure that may be natural or anthropogenically derived (e.g. engineering and industrial activities). However, our understanding of how acute CO2 events impact marine life is restricted to individual organisms, with little understanding for how this manifests at the community level. Here, we investigated in situ the effect of acute CO2 enrichment on the coralline algal ecosystem—a globally ubiquitous, ecologically and economically important habitat, but one which is likely to be sensitive to CO2 enrichment due to its highly calcified reef-like structures engineered by coralline algae. Most notably, we observed a rapid community-level shift to favour net dissolution rather than net calcification. Smaller changes from net respiration to net photosynthesis were also observed. There was no effect on the net flux of DMS/DMSP (algal secondary metabolites), nor on the nutrients nitrate and phosphate. Following return to ambient CO2 levels, only a partial recovery was seen within the monitoring timeframe. This study highlights the sensitivity of biogenic carbonate marine communities to acute CO2 enrichment and raises concerns over the capacity for the system to ‘bounce back’ if subjected to repeated acute high-CO2 events.

KEY WORDS: Calcification · Photosynthesis · Community · Ecosystem · Maerl bed · Carbon dioxide · Acidification

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Cite this article as: Burdett HL, Perna G, McKay L, Broomhead G, Kamenos NA (2018) Community-level sensitivity of a calcifying ecosystem to acute in situ CO2 enrichment. Mar Ecol Prog Ser 587:73-80.

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