Environmental and biological controls on Na / Ca ratios in scleractinian cold-water corals

• Main Authors: Schleinkofer, Nicolai, Raddatz, Jacek, Freiwald, André, Evans, David, Beuck, Lydia, Rüggeberg, Andres, Liebetrau, Volker
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2019
• Subjects: ddc:550; Lophelia pertusa
• Online Access: http://publikationen.ub.uni-frankfurt.de/frontdoor/index/index/docId/49949; https://nbn-resolving.org/urn:nbn:de:hebis:30:3-499497; https://doi.org/10.5194/bg-2019-40; http://publikationen.ub.uni-frankfurt.de/files/49949/container.zip

Here we present a comprehensive attempt to correlate aragonitic Na / Ca ratios from 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 content 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) but a significant inverse correlation with temperature (−0.31 mmol/mol/°C). 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 appear 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.