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| Titel |
Calcification of the cold-water coral Lophelia pertusa, under ambient and reduced pH |
| VerfasserIn |
C. Maier, J. Hegeman, M. G. Weinbauer, J.-P. Gattuso |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 6, no. 8 ; Nr. 6, no. 8 (2009-08-14), S.1671-1680 |
| Datensatznummer |
250003955
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| Publikation (Nr.) |
 copernicus.org/bg-6-1671-2009.pdf |
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| Zusammenfassung |
| 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 45Ca
incorporation) even at an aragonite saturation state (Ωa) below
1. |
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