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Advances in the aquatic sciences
RESEARCH ARTICLE (Open Access)

Element composition of shark vertebrae shows promise as a natural tag

J. C. A. Pistevos https://orcid.org/0000-0001-8081-7069 A B E , P. Reis-Santos https://orcid.org/0000-0001-9843-9465 A C , C. Izzo https://orcid.org/0000-0001-7071-7347 A D and B. M. Gillanders https://orcid.org/0000-0002-7680-2240 A
+ Author Affiliations
- Author Affiliations

A Southern Seas Ecology Laboratories, School of Biological Sciences, The University of Adelaide, SA 5005, Australia.

B Paris Sciences et Lettres (PSL) Research University, EPHE-UPVD-CNRS, USR 3278 CRIOBE and Laboratoire d’Excellence CORAIL, BP 1013, 98729 Papetoai, Moorea, French Polynesia.

C MARE – Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, PT-1749-016, Lisboa, Portugal.

D Fisheries Research and Development Corporation, PO Box 2733, Kent Town, SA 5071, Australia.

E Corresponding author. Email: jennifer.pistevos@ephe.sorbonne.fr

Marine and Freshwater Research 70(12) 1722-1733 https://doi.org/10.1071/MF18423
Submitted: 2 November 2018  Accepted: 1 May 2019   Published: 13 August 2019

Journal Compilation © CSIRO 2019 Open Access CC BY-NC-ND

Abstract

Reconstructing movements and environmental histories of sharks may be possible by using the element composition of vertebrae, but unlocking such possibilities requires an understanding of the effects of extrinsic and intrinsic factors on element composition. We assessed water temperature and pH effects (independently and in combination) on vertebral chemistry of Port Jackson sharks while accounting for intrinsic factors (condition and sex) using indoor aquaria and outdoor mesocosm environments, where the latter may better reflect natural field conditions. We analysed eight element : Ca ratios (7Li, 8B, 24Mg, 55Mn, 65Cu, 88Sr, 138Ba and 238U) by laser ablation inductively coupled plasma mass spectrometry and found positive temperature-dependant responses for multiple elements, including B : Ca, Mn : Ca, Sr : Ca and Ba : Ca (r2 = 0.43, 0.22, 0.60 and 0.35 respectively), whereas pH had a minor effect on vertebral Mg : Ca and Li : Ca (r2 = 0.10 and 0.31 respectively). As shown for teleost otoliths, condition affected element composition (Mn : Ca), suggesting potential physiological influences on element uptake. The suitability of vertebral chemistry as a natural tag appears to be element specific, and likely governed by a suite of potentially codependent extrinsic and intrinsic factors. Overall, variations in vertebrae chemistry show promise to reconstruct movements and habitat use of cartilaginous fishes. Yet, further research is required to understand the ubiquitous nature of the findings presented here.

Additional keywords: acidification, condition, elasmobranchs, Heterodontus portusjacksoni, hydroxyapatite, vertebrae chemistry.


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