Preprints
https://doi.org/10.5194/bg-2022-10
https://doi.org/10.5194/bg-2022-10
 
19 Jan 2022
19 Jan 2022
Status: a revised version of this preprint was accepted for the journal BG and is expected to appear here in due course.

Intraskeletal variability in phosphate oxygen isotope composition reveals regional heterothermies in marine vertebrates

Nicolas Séon1, Romain Amiot2, Guillaume Suan2, Christophe Lécuyer2,5, François Fourel3, Fabien Demaret4, Arnauld Vinçon-Laugier2, Sylvain Charbonnier1, and Peggy Vincent1 Nicolas Séon et al.
  • 1Centre de Recherche en Paléontologie - Paris (CR2P), CNRS, Muséum national d’Histoire naturelle, Sorbonne Université, 57 rue Cuvier, 75231 Paris Cedex 05
  • 2Univ Lyon, UCBL, ENSL, UJM, CNRS, LGL-TPE, F-69622, Villeurbanne, France
  • 3Laboratoire d’Ecologie des Hydrosystèmes Naturels et Anthropisés, CNRS UMR 5023, Université Claude Bernard Lyon 1, Villeurbanne, France
  • 4Observatoire PELAGIS, UMS 3462 CNRS/Université de La Rochelle, Pôle Analytique, 5 allée de l’Océan, 17000 La Rochelle, France
  • 5Institut Universitaire de France

Abstract. Strategies used by marine vertebrates to regulate their body temperature can result in local variations, and the knowledge of these regional heterothermies is crucial for better understanding the thermophysiologies of extant and extinct organisms. In order to investigate regional heterothermy in vertebrates, we analysed the oxygen isotope composition of phosphatic skeletal elements (δ18Op) of two poikilothermic (Atlantic bluefin tuna and swordfish) and three homeothermic endotherms (dolphins). We observed a consistent link between δ18Op variations and temperature heterogeneities recorded by classical methods. Our δ18Op data indicate that: (i) bone hydroxyapatite of the axial skeleton of dolphins mineralize at a warmer temperature than that of the appendicular one, (ii) the skull is the warmest body region in swordfish, and (iii) Atlantic bluefin tuna possesses high body temperature in the skull and visceral mass region. These results demonstrate the possibility of tracking regional heterothermies in extant marine vertebrates using the δ18Op, paving the way to direct assessment of thermophysiological specificities of both living and extinct vertebrates. From a paleoenvironmental perspective, the significant observed δ18Op variability questions the use of some taxa or random skeletal elements for the reconstruction of paleoceanographic parameters such as seawater temperature and δ18O.

Nicolas Séon et al.

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2022-10', Anonymous Referee #1, 10 Feb 2022
  • RC2: 'Comment on bg-2022-10', Anonymous Referee #2, 05 Apr 2022

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on bg-2022-10', Anonymous Referee #1, 10 Feb 2022
  • RC2: 'Comment on bg-2022-10', Anonymous Referee #2, 05 Apr 2022

Nicolas Séon et al.

Nicolas Séon et al.

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Short summary
We analysed the oxygen isotope composition of bones and teeth of four marine species possessing regional heterothermies. We observed a consistent link between oxygen isotope composition and temperature heterogeneities recorded by classical methods. This opens up new perspectives on the determination of the thermoregulatory strategies of extant marine vertebrates for which conventional methods are difficult to apply, but also allows to investigate thermophysiologies of extinct vertebrates.
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