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Interacting effects of CO 2 partial pressure and temperature on photosynthesis and calcification in a scleractinian coral

Interacting effects of CO 2 partial pressure and temperature on photosynthesis and calcification... We show here that CO2 partial pressure (pCO2) and temperature significantly interact on coral physiology. The effects of increased pCO2 and temperature on photosynthesis, respiration and calcification rates were investigated in the scleractinian coral Stylophora pistillata. Cuttings were exposed to temperatures of 25°C or 28°C and to pCO2 values of ca. 460 or 760 μatm for 5 weeks. The contents of chlorophyll c2 and protein remained constant throughout the experiment, while the chlorophyll a content was significantly affected by temperature, and was higher under the ‘high‐temperature–high‐pCO2’ condition. The cell‐specific density was higher at ‘high pCO2’ than at ‘normal pCO2’ (1.7 vs. 1.4). The net photosynthesis normalized per unit protein was affected by both temperature and pCO2, whereas respiration was not affected by the treatments. Calcification decreased by 50% when temperature and pCO2 were both elevated. Calcification under normal temperature did not change in response to an increased pCO2. This is not in agreement with numerous published papers that describe a negative relationship between marine calcification and CO2. The confounding effect of temperature has the potential to explain a large portion of the variability of the relationship between calcification and pCO2 reported in the literature, and warrants a re‐evaluation of the projected decrease of marine calcification by the year 2100. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Global Change Biology Wiley

Interacting effects of CO 2 partial pressure and temperature on photosynthesis and calcification in a scleractinian coral

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References (54)

Publisher
Wiley
Copyright
Copyright © 2003 Wiley Subscription Services, Inc., A Wiley Company
ISSN
1354-1013
eISSN
1365-2486
DOI
10.1046/j.1365-2486.2003.00678.x
Publisher site
See Article on Publisher Site

Abstract

We show here that CO2 partial pressure (pCO2) and temperature significantly interact on coral physiology. The effects of increased pCO2 and temperature on photosynthesis, respiration and calcification rates were investigated in the scleractinian coral Stylophora pistillata. Cuttings were exposed to temperatures of 25°C or 28°C and to pCO2 values of ca. 460 or 760 μatm for 5 weeks. The contents of chlorophyll c2 and protein remained constant throughout the experiment, while the chlorophyll a content was significantly affected by temperature, and was higher under the ‘high‐temperature–high‐pCO2’ condition. The cell‐specific density was higher at ‘high pCO2’ than at ‘normal pCO2’ (1.7 vs. 1.4). The net photosynthesis normalized per unit protein was affected by both temperature and pCO2, whereas respiration was not affected by the treatments. Calcification decreased by 50% when temperature and pCO2 were both elevated. Calcification under normal temperature did not change in response to an increased pCO2. This is not in agreement with numerous published papers that describe a negative relationship between marine calcification and CO2. The confounding effect of temperature has the potential to explain a large portion of the variability of the relationship between calcification and pCO2 reported in the literature, and warrants a re‐evaluation of the projected decrease of marine calcification by the year 2100.

Journal

Global Change BiologyWiley

Published: Nov 1, 2003

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