Short-term responses of the cold water coral Lophelia pertusa to predicted rises in atmospheric CO2

Hennige, SJ; Wicks, LCW; Kamenos, NAK; Bakker, DCE; Findlay, HS; Dumousseaud, C; Roberts, JM. 2014 Short-term responses of the cold water coral Lophelia pertusa to predicted rises in atmospheric CO2. Deep Sea Research Part II: Topical Studies in Oceanography, 99. 27-35. doi.org/10.1016/j.dsr2.2013.07.005

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Abstract/Summary

Cold-water corals are associated with high local biodiversity, but despite their importance as ecosystem engineers, little is known about how these organisms will respond to projected ocean acidification. Since preindustrial times, average ocean pH has decreased from 8.2 to ~8.1, and predicted CO2 emissions will decrease by up to another 0.3 pH units by the end of the century. This decrease in pH may have a wide range of impacts upon marine life, and in particular upon calcifiers such as cold-water corals. Lophelia pertusa is the most widespread cold-water coral (CWC) species, frequently found in the North Atlantic. Here, we present the first short-term (21 days) data on the effects of increased CO2 (750 ppm) upon the metabolism of freshly collected L. pertusa from Mingulay Reef Complex, Scotland, for comparison with net calcification. Over 21 days, corals exposed to increased CO2 conditions had significantly lower respiration rates (11.4±1.39 SE, µmol O2 g−1 tissue dry weight h−1) than corals in control conditions (28.6±7.30 SE µmol O2 g−1 tissue dry weight h−1). There was no corresponding change in calcification rates between treatments, measured using the alkalinity anomaly technique and 14C uptake. The decrease in respiration rate and maintenance of calcification rate indicates an energetic imbalance, likely facilitated by utilisation of lipid reserves. These data from freshly collected L. pertusa from the Mingulay Reef Complex will help define the impact of ocean acidification upon the growth, physiology and structural integrity of this key reef framework forming species.

Item Type: Publication - Article
Additional Keywords: Climate change; Lophelia pertusa; Deep-sea coral; Respiration; Growth; Calcification; Mingulay Reef Complex
Subjects: Marine Sciences
Oceanography
Divisions: Plymouth Marine Laboratory > Science Areas > Cycling in the Sunlit Ocean
Depositing User: Helen Findlay
Date made live: 05 Jun 2014 16:10
Last Modified: 06 Jun 2017 16:11
URI: http://plymsea.ac.uk/id/eprint/6041

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