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Calcium stable isotopes place Devonian conodonts as first level consumers

V. Balter1,

1Laboratoire de Géologie de Lyon. UMR 5276 CNRS, ENS Lyon, Univ. Lyon1. 46, Allée d'Italie, 69342 Lyon Cedex 07, France

J.E. Martin1,

1Laboratoire de Géologie de Lyon. UMR 5276 CNRS, ENS Lyon, Univ. Lyon1. 46, Allée d'Italie, 69342 Lyon Cedex 07, France

T. Tacail2,

2Bristol Isotope Group, School of Earth Sciences, University of Bristol, Wills Memorial Building, Queen's Road, Bristol, BS8 1RJ, UK

G. Suan1,

1Laboratoire de Géologie de Lyon. UMR 5276 CNRS, ENS Lyon, Univ. Lyon1. 46, Allée d'Italie, 69342 Lyon Cedex 07, France

S. Renaud3,

3Laboratoire de Biométrie et Biologie Evolutive. UMR 5558 CNRS, Univ. Lyon1. Bâtiment Mendel. 43, bd du 11 novembre 1918, 69622 Villeurbanne Cedex, France

C. Girard4

4Institut des Sciences de l'Evolution de Montpellier. UMR 5554 CNRS, Univ. Montpellier 2 Place Eugene Bataillon, 34095 Montpellier Cedex 05, France

Affiliations  |  Corresponding Author  |  Cite as  |  Funding information

Balter, V., Martin, J.E., Tacail, T., Suan, G., Renaud, S., Girard, C. (2019) Calcium stable isotopes place Devonian conodonts as first level consumers. Geochem. Persp. Let. 10, 36–39.

ANR project Ecodev (ANR-13-BSV7-0005)

Geochemical Perspectives Letters v10  |  doi: 10.7185/geochemlet.1912
Received 17 September 2018  |  Accepted 17 March 2019  |  Published 26 April 2019
Copyright © The Authors

Published by the European Association of Geochemistry
under Creative Commons License CC BY-NC-ND 4.0




Figure 1 Ca isotope compositions of conodonts (δ44/42Ca) relative to SRM915a (‰) measured in the study.
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Figure 2 Ca isotopic offset between seawater and hap of modern elasmobranchs compared to that of conodonts (Δ44/42Casw-hap) measured in the study. Modern elasmobranch data are from Martin et al. (2015)

Martin, J.E., Tacail, T., Adnet, S., Girard, C., Balter, V. (2015) Calcium isotopes reveal the trophic position of extant and fossil elasmobranchs. Chemical Geology 415, 118-125.

. The Δ44/42Casw-hap offset is calculated with two δ44/42Casw values, 0.55 ‰ (diagonal lines) and 0.67 ‰ (diagonal cross hatch) corresponding to the range given by Farkaš et al. (2007

Farkaš, J., Böhm, F., Wallmann, K., Blenkinsop, J., Eisenhauer, A., van Geldern, R., Munnecke, A., Voigt, S., Veizer, J. (2007) Calcium isotope record of Phanerozoic oceans: implications for chemical evolution of seawater and its causative mechanisms: Geochimica et Cosmochimica Acta 71, 5117-5134.

; Fig. S-3). Boxplots delimit 5, 25, 50, 75 and 95 % percentiles. Depending on the δ44/42Casw value, statistics show that conodonts and zooplanktivores have similar δ44/42Ca values. Under the null hypothesis that there is no difference in the distribution of two groups of δ44/42Ca values, the p value of Student's t-tests provides the smallest level of significance at which null hypothesis would be rejected (NS, non-significant p value; *p = 0.010.05; **p = 0.0010.01; and ***p < 0.001).
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