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Microwear–mesowear congruence and mortality bias in rhinoceros mass-death assemblages

Published online by Cambridge University Press:  21 November 2017

Matthew C. Mihlbachler ,
Daniel Campbell ,
Charlotte Chen ,
Michael Ayoub  and
Pawandeep Kaur
Matthew C. Mihlbachler
Affiliation:
Department of Anatomy, New York Institute of Technology College of Osteopathic Medicine, Northern Boulevard, Old Westbury, New York 11568, and Division of Paleontology, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, U.S.A. E-mail: [email protected]
Daniel Campbell
Affiliation:
New York Institute of Technology College of Osteopathic Medicine, Northern Boulevard, Old Westbury, New York 11568, U.S.A.
Charlotte Chen
Affiliation:
New York Institute of Technology College of Osteopathic Medicine, Northern Boulevard, Old Westbury, New York 11568, U.S.A.
Michael Ayoub
Affiliation:
New York Institute of Technology College of Osteopathic Medicine, Northern Boulevard, Old Westbury, New York 11568, U.S.A.
Pawandeep Kaur
Affiliation:
New York Institute of Technology College of Osteopathic Medicine, Northern Boulevard, Old Westbury, New York 11568, U.S.A.
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Abstract

Although we do not know the cause of death of most fossil animals, mortality is often associated with ecological stress due to seasonality and other stochastic events (droughts, storms, volcanism) that may have caused shifts in feeding ecology preceding death. In these instances, dental microwear, which reflects feeding ecology in a narrow window of time, may provide a biased view of diet. Mesowear, another dental-wear proxy based on the morphology of worn cusps, requires macroscopic amounts of dental wear and reflects diet for a longer interval and may be less prone to bias from near-death ecological stress. We compared congruence between microwear and mesowear of North American, fossil rhinocerotid mass-death assemblages and collections of hunted modern rhinocerotids to test the hypothesis that fossil assemblages yield more incongruous microwear and mesowear data as a result of near-death ecological disturbances. In extant rhinos, both mesowear and microwear are associated with diet and height of the feeding environment. Mesowear and microwear in the modern rhinocerotid collections are statistically correlated, with strong relationships between average mesowear scores and labially distributed dental microwear. In contrast, a relationship between mesowear and microwear was not observed among the fossil rhinocerotid assemblages. Mesowear suggests that the fossil rhinos had low-abrasion diets, suggesting that they fed from clean, possibly tall vegetation. Some, but not all, mass-death assemblages produce microwear data with excessive scratches and/or pits compared with expectations based on mesowear results, suggesting that dental microwear was altered shortly before death in some but not all of the fossil assemblages. The dental-wear proxies available to paleoecologists provide a mosaic of dietary evidence reflecting diet over long (mesowear) and more abbreviated (microwear) periods of time that, together, provide a richer understanding of feeding ecology and its relationship to environment, seasonal change, and other ecological disturbances.

Type
Articles
Information
Paleobiology , Volume 44 , Issue 1 , February 2018 , pp. 131 - 154
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Copyright © 2017 The Paleontological Society. All rights reserved 

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