期刊
BIOGEOSCIENCES
卷 6, 期 8, 页码 1671-1680出版社
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/bg-6-1671-2009
关键词
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资金
- Dutch Science Foundation (NWO) [835.20.024, 814.01.005]
- European Commission [220299]
- European Project on Ocean Acidification (EPOCA) [211384]
The cold-water coral Lophelia pertusa is one of the few species able to build reef-like structures and a 3-dimensional coral framework in the deep oceans. Furthermore, deep cold-water coral bioherms may be among the first marine ecosystems to be affected by ocean acidification. Colonies of L. pertusa were collected during a cruise in 2006 to cold-water coral bioherms of the Mingulay reef complex (Hebrides, North Atlantic). Shortly after sample collection onboard these corals were labelled with calcium-45. The same experimental approach was used to assess calcification rates and how those changed due to reduced pH during a cruise to the Skagerrak (North Sea) in 2007. The highest calcification rates were found in youngest polyps with up to 1%d(-1) new skeletal growth and average rates of 0.11 +/- 0.02% d(-1)(+/- S.E.). Lowering pH by 0.15 and 0.3 units relative to the ambient level resulted in calcification being reduced by 30 and 56%. Lower pH reduced calcification more in fast growing, young polyps (59% reduction) than in older polyps (40% reduction). Thus skeletal growth of young and fast calcifying corallites suffered more from ocean acidification. Nevertheless, L. pertusa exhibited positive net calcification (as measured by Ca-45 incorporation) even at an aragonite saturation state (Omega(a)) below 1.
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