NDLI: Effects of light and elevated pCO2 on the growth and photochemical efficiency of Acropora cervicornis

Content Provider	Springer Nature Link
Author	Echs, I. C. Manzello, D. P. Carlton, R. Schopmeyer, S. Hooidonk, R. Lirman, D.
Copyright Year	2014
Abstract	The effects of light and elevated pCO2 on the growth and photochemical efficiency of the critically endangered staghorn coral, Acropora cervicornis, were examined experimentally. Corals were subjected to high and low treatments of CO2 and light in a fully crossed design and monitored using 3D scanning and buoyant weight methodologies. Calcification rates, linear extension, as well as colony surface area and volume of A. cervicornis were highly dependent on light intensity. At pCO2 levels projected to occur by the end of the century from ocean acidification (OA), A. cervicornis exhibited depressed calcification, but no change in linear extension. Photochemical efficiency (F v /F m ) was higher at low light, but unaffected by CO2. Amelioration of OA-depressed calcification under high-light treatments was not observed, and we suggest that the high-light intensity necessary to reach saturation of photosynthesis and calcification in A. cervicornis may limit the effectiveness of this potentially protective mechanism in this species. High CO2 causes depressed skeletal density, but not linear extension, illustrating that the measurement of extension by itself is inadequate to detect CO2 impacts. The skeletal integrity of A. cervicornis will be impaired by OA, which may further reduce the resilience of the already diminished populations of this endangered species.
Starting Page	477
Ending Page	485
Page Count	9
File Format	PDF
ISSN	07224028
Journal	Coral Reefs
Volume Number	33
Issue Number	2
e-ISSN	14320975
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-03-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Acropora cervicornis Ocean acidification Light Calcification Freshwater & Marine Ecology Oceanography
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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