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The influence of seawater pH on U/Ca ratios in the scleractinian cold-water coral Lophelia pertusa

(2014) BIOGEOSCIENCES. 11(7). p.1863-1871
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Abstract
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.
Keywords
ISOTOPIC COMPOSITION, DEEP-SEA CORALS, OCEAN ACIDIFICATION, DESMOPHYLLUM-DIANTHUS, PORCUPINE SEABIGHT, NORTHEAST ATLANTIC, GROWTH HISTORY, PROXY, CALCIFICATION, CHEMISTRY

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MLA
Raddatz, J., et al. “The Influence of Seawater PH on U/Ca Ratios in the Scleractinian Cold-Water Coral Lophelia Pertusa.” BIOGEOSCIENCES, vol. 11, no. 7, 2014, pp. 1863–71, doi:10.5194/bg-11-1863-2014.
APA
Raddatz, J., Rüggeberg, A., Flögel, S., Hathorne, E., Liebetrau, V., Eisenhauer, A., & Dullo, W.-C. (2014). The influence of seawater pH on U/Ca ratios in the scleractinian cold-water coral Lophelia pertusa. BIOGEOSCIENCES, 11(7), 1863–1871. https://doi.org/10.5194/bg-11-1863-2014
Chicago author-date
Raddatz, J, Andres Rüggeberg, S Flögel, EC Hathorne, V Liebetrau, A Eisenhauer, and W-Chr Dullo. 2014. “The Influence of Seawater PH on U/Ca Ratios in the Scleractinian Cold-Water Coral Lophelia Pertusa.” BIOGEOSCIENCES 11 (7): 1863–71. https://doi.org/10.5194/bg-11-1863-2014.
Chicago author-date (all authors)
Raddatz, J, Andres Rüggeberg, S Flögel, EC Hathorne, V Liebetrau, A Eisenhauer, and W-Chr Dullo. 2014. “The Influence of Seawater PH on U/Ca Ratios in the Scleractinian Cold-Water Coral Lophelia Pertusa.” BIOGEOSCIENCES 11 (7): 1863–1871. doi:10.5194/bg-11-1863-2014.
Vancouver
1.
Raddatz J, Rüggeberg A, Flögel S, Hathorne E, Liebetrau V, Eisenhauer A, et al. The influence of seawater pH on U/Ca ratios in the scleractinian cold-water coral Lophelia pertusa. BIOGEOSCIENCES. 2014;11(7):1863–71.
IEEE
[1]
J. Raddatz et al., “The influence of seawater pH on U/Ca ratios in the scleractinian cold-water coral Lophelia pertusa,” BIOGEOSCIENCES, vol. 11, no. 7, pp. 1863–1871, 2014.
@article{4417152,
  abstract     = {{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.}},
  author       = {{Raddatz, J and Rüggeberg, Andres and Flögel, S and Hathorne, EC and Liebetrau, V and Eisenhauer, A and Dullo, W-Chr}},
  issn         = {{1726-4170}},
  journal      = {{BIOGEOSCIENCES}},
  keywords     = {{ISOTOPIC COMPOSITION,DEEP-SEA CORALS,OCEAN ACIDIFICATION,DESMOPHYLLUM-DIANTHUS,PORCUPINE SEABIGHT,NORTHEAST ATLANTIC,GROWTH HISTORY,PROXY,CALCIFICATION,CHEMISTRY}},
  language     = {{eng}},
  number       = {{7}},
  pages        = {{1863--1871}},
  title        = {{The influence of seawater pH on U/Ca ratios in the scleractinian cold-water coral Lophelia pertusa}},
  url          = {{http://doi.org/10.5194/bg-11-1863-2014}},
  volume       = {{11}},
  year         = {{2014}},
}

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