TY  - JOUR
A1  - Schleinkofer, Nicolai
A1  - Raddatz, Jacek
A1  - Freiwald, André
A1  - Evans, David
A1  - Beuck, Lydia
A1  - Rüggeberg, Andres
A1  - Liebetrau, Volker
T1  - Environmental and biological controls on Na∕Ca ratios in scleractinian cold-water corals
T2  - Biogeosciences
N2  - Here we present a comprehensive attempt to correlate aragonitic Na∕Ca ratios from Desmophyllum pertusum (formerly known as Lophelia pertusa), Madrepora oculata and a caryophylliid cold-water coral (CWC) species with different seawater parameters such as temperature, salinity and pH. Living CWC specimens were collected from 16 different locations and analyzed for their Na∕Ca ratios using solution-based inductively coupled plasma-optical emission spectrometry (ICP-OES) measurements.
The results reveal no apparent correlation with salinity (30.1–40.57 g kg−1) but a significant inverse correlation with temperature (−0.31±0.04 mmolmol−1∘C−1). Other marine aragonitic organisms such as Mytilus edulis (inner aragonitic shell portion) and Porites sp. exhibit similar results highlighting the consistency of the calculated CWC regressions. Corresponding Na∕Mg ratios show a similar temperature sensitivity to Na∕Ca ratios, but the combination of two ratios appears to reduce the impact of vital effects and domain-dependent geochemical variation. The high degree of scatter and elemental heterogeneities between the different skeletal features in both Na∕Ca and Na∕Mg, however, limit the use of these ratios as a proxy and/or make a high number of samples necessary. Additionally, we explore two models to explain the observed temperature sensitivity of Na∕Ca ratios for an open and semi-enclosed calcifying space based on temperature-sensitive Na- and Ca-pumping enzymes and transport proteins that change the composition of the calcifying fluid and consequently the skeletal Na∕Ca ratio.
Y1  - 2019
UR  - http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/52588
UR  - https://nbn-resolving.org/urn:nbn:de:hebis:30:3-525882
SN  - 1726-4189
N1  - © Author(s) 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
N1  - Diskussionspapier erschienen in: Biogeosciences discussions, 2019, doi:10.5194/bg-2019-40
VL  - 16
IS  - 18
SP  - 3565
EP  - 3582
PB  - Copernicus
CY  - Katlenburg-Lindau [u. a.]
ER  -