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Tooth microwear texture in odontocete whales: variation with tooth characteristics and implications for dietary analysis

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journal contribution
posted on 11.01.2018 by Mark A. Purnell, Robert H. Goodall, Scott Thomson, Cory J. D. Matthews
Understanding the diets and trophic relationships of toothed whales is central to understanding their roles in marine ecosystems, and associated conservation issues. Yet this is problematic because direct observation of what free ranging marine mammals eat is difficult. Quantitative 3D textural analysis of tooth microwear (DMTA) offers a new way of investigating diet in odontocetes and other marine mammals, but the application of this approach requires that we first understand how non-dietary variables affect the texture of microwear in odontocetes. Here we present the first analysis of microwear texture in odontocetes (beluga, Delphinapterus leucas) testing null hypotheses that microwear texture does not vary with dental surface tissue type (dentine, cementum), and that microwear texture does not vary with tooth characteristics (location in jaw, degree of wear, wear facet slope and facet orientation). Our results reveal that these variables have a significant impact on microwear textures, and thus have the potential to mask variation in texture caused by dietary differences. This does not mean that microwear texture analysis cannot be used as a tool for dietary analysis in toothed whales, but any future studies should adopt sampling protocols that standardize non-dietary variables to mitigate their effects in DMTA analysis.

Funding

We thank Al McGowan for facilitating initial contact between MAP and CJDM; Inuit hunters from Sanikiluaq, Nunavut, for collecting specimens as part of community-based monitoring programs; Blair Dunn and Steve Ferguson (DFO) for managing, curating and providing access to specimens. MAP thanks Zong-Rong Zhou and Peter Ungar for the invitation to participate in the workshop on Dental Biotribology in Chengdu, China, and workshop participants for their comments. Funded in part by NERC grant NE/J017728/1 (to M.A.P).

History

Citation

Biosurface and Biotribology, 2017

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment

Version

VoR (Version of Record)

Published in

Biosurface and Biotribology

Publisher

Elsevier

eissn

2405-4518

Acceptance date

30/11/2017

Copyright date

2017

Available date

11/01/2018

Publisher version

http://www.sciencedirect.com/science/article/pii/S2405451817300399?via=ihub

Notes

Supplementary data associated with this article can be found in the online version at http://dx.doi.org/10.1016/j.bsbt.2017.11.004.

Language

en

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