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| Titel |
The influence of seawater pH on U / Ca ratios in the scleractinian cold-water coral Lophelia pertusa |
| VerfasserIn |
J. Raddatz, A. Rüggeberg, S. Flögel, E. C. Hathorne, V. Liebetrau, A. Eisenhauer, W.-Chr. Dullo  |
| 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 ; 11, no. 7 ; Nr. 11, no. 7 (2014-04-08), S.1863-1871 |
| Datensatznummer |
250117346
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| Publikation (Nr.) |
 copernicus.org/bg-11-1863-2014.pdf |
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| Zusammenfassung |
The increasing pCO2 in seawater is a serious threat for marine
calcifiers and alters the biogeochemistry of the ocean. Therefore, the
reconstruction of past-seawater properties and their impact on marine
ecosystems is an important way to investigate the underlying mechanisms and
to better constrain the effects of possible changes in the future ocean.
Cold-water coral (CWC) ecosystems are biodiversity hotspots. Living close to
aragonite undersaturation, these corals serve as living laboratories as well
as archives to reconstruct the boundary conditions of their calcification
under the carbonate system of the ocean.
We investigated the reef-building CWC Lophelia pertusa as a recorder
of intermediate ocean seawater pH. This species-specific field calibration is
based on a unique sample set of live in situ collected L. pertusa
and corresponding seawater samples. These data demonstrate that uranium
speciation and skeletal incorporation for azooxanthellate scleractinian CWCs
is pH dependent and can be reconstructed with an uncertainty of ±0.15.
Our Lophelia U / Ca–pH calibration appears to be controlled by the
high pH values and thus highlighting the need for future coral and seawater
sampling to refine this relationship. However, this study recommends
L. pertusa as a new archive for the reconstruction of intermediate
water mass pH and hence may help to constrain tipping points for ecosystem
dynamics and evolutionary characteristics in a changing ocean. |
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