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

  • Schleinkofer, Nicolai Institute of Geosciences, Goethe University Frankfurt, Germany - Frankfurt Isotope and Element Research Center (FIERCE), Goethe University Frankfurt, Germany
  • Raddatz, Jacek Institute of Geosciences, Goethe University Frankfurt, Germany - Frankfurt Isotope and Element Research Center (FIERCE), Goethe University Frankfurt, Germany
  • Freiwald, André Senckenberg am Meer, Marine Research Department, Wilhelmshaven, Germany - MARUM (Zentrum für Marine Umweltwissenschaften), Bremen University, Bremen, Germany
  • Evans, David Institute of Geosciences, Goethe University Frankfurt, Germany - Frankfurt Isotope and Element Research Center (FIERCE), Goethe University Frankfurt, Germany
  • Beuck, Lydia Senckenberg am Meer, Marine Research Department, Wilhelmshaven, Germany
  • Rüggeberg, Andres Department of Geosciences, Faculty of Science and Medicine, University of Fribourg, Switzerland
  • Liebetrau, Volker GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany
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    20.09.2019
Published in:
  • Biogeosciences. - 2019, vol. 16, no. 18, p. 3565–3582
English 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.
Faculty
Faculté des sciences et de médecine
Department
Département de Géosciences
Language
  • English
Classification
Ecology
License
License undefined
Identifiers
Persistent URL
https://folia.unifr.ch/unifr/documents/308145
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