Reconstructing molar growth from enamel histology in extant and extinct Equus
Nacarino-Meneses, Carmen (Institut Català de Paleontologia Miquel Crusafont)
Jordana Comín, Xavier (Universitat Autònoma de Barcelona. Departament de Biologia Animal, de Biologia Vegetal i d'Ecologia)
Orlandi Oliveras, Guillem 1992- (Institut Català de Paleontologia Miquel Crusafont)
Köhler, Meike (Institut Català de Paleontologia Miquel Crusafont)

Date:	2017
Abstract:	The way teeth grow is recorded in dental enamel as incremental marks. Detailed analysis of tooth growth is known to provide valuable insights into the growth and the pace of life of vertebrates. Here, we study the growth pattern of the frst lower molar in several extant and extinct species of Equus and explore its relationship with life history events. Our histological analysis shows that enamel extends beyond the molar's cervix in these mammals. We identifed three diferent crown developmental stages (CDS) in the frst lower molars of equids characterised by diferent growth rates and likely to be related to structural and ontogenetic modifcations of the tooth. Enamel extension rate, which ranges from ≈400 μm/d at the beginning of crown development to rates of ≈30 μm/d near the root, and daily secretion rate (≈17 μm/d) have been shown to be very conservative within the genus. From our results, we also inferred data of molar wear rate for these equids that suggest higher wear rates at early ontogenetic stages (13mm/y) than commonly assumed. The results obtained here provide a basis for future studies of equid dentition in diferent scientifc areas, involving isotope, demographic and dietary studies.
Grants:	Ministerio de Economía y Competitividad CGL2015-63777 Agència de Gestió d'Ajuts Universitaris i de Recerca 2014/SGR-1207 Ministerio de Economía y Competitividad BES-2013-066335 Agència de Gestió d'Ajuts Universitaris i de Recerca 2016/FI_B00202
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Published in:	Scientific reports, Vol. 7, (November 2017) , art. 15965, ISSN 2045-2322

DOI: 10.1038/s41598-017-16227-2
PMID: 29162890

12 p, 2.3 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut Català de Paleontologia Miquel Crusafont (ICP)
Articles > Research articles
Articles > Published articles