First fossil evidence for the advance of replacement teeth coupled with life history evolution along an anagenetic mammalian lineage
Jordana Comín, Xavier (Institut Català de Paleontologia Miquel Crusafont)
Marín Moratalla, Miren Nekane (Institut Català de Paleontologia Miquel Crusafont)
Moncunill Solé, Blanca (Institut Català de Paleontologia Miquel Crusafont)
Bover, Pere (Institut Mediterrani d'Estudis Avançats)
Alcover, Josep Antoni (Institut Mediterrani d'Estudis Avançats)
Köhler, Meike (Institut Català de Paleontologia Miquel Crusafont)
Institució Catalana de Recerca i Estudis Avançats

Data:	2013
Resum:	In mammals that grow up more slowly and live longer, replacement teeth tend to appear earlier in sequence than in fast growing mammals. This trend, known as 'Schultz's Rule', is a useful tool for inferring life histories of fossil taxa. Deviations from this rule, however, suggest that in addition to the pace of life history, ecological factors may also drive dental ontogeny. Myotragus balearicus is an extinct insular caprine that has been proved to be an excellent test case to correlate morphological traits with life history. Here we show that Myotragus balearicus exhibits a slow signature of dental eruption sequence that is in agreement with the exceptionally slow life history of this species, thus conforming to 'Schultz's Rule'. However, our results also show an acceleration of the absolute pace of development of the permanent incisors in relation to that of the posterior teeth. The rodent-like incisors of Myotragus balearicus erupted early not only in relative but also in absolute terms (chronological age), suggesting that feeding characteristics also plays an important role in dental ontogeny. This is in agreement with ecological hypotheses based on primates. Our study documents a decoupling of the pace of development of teeth in mammals that is triggered by different selection pressures on dental ontogeny. Moreover, we show that Myotragus kopperi from the early Pleistocene (a direct ancestor of the late Pleistocene-Holocene M. balearicus) follows the pattern of first incisor replacement known in living bovids. Hence, the advance in the eruption sequence of the first incisors occurs along the Myotragus evolutionary lineage over a period of about 2. 5 Myr. To our knowledge, this is the first fossil evidence of an advance of the emergence of the permanent first incisor along an anagenetic mammalian lineage.
Ajuts:	Ministerio de Economía y Competitividad CGL2012-34459 Ministerio de Economía y Competitividad CGL2011-24685 Ministerio de Economía y Competitividad BES2009/02641 Ministerio de Educación, Cultura y Deporte AP2010-2393 Ministerio de Economía y Competitividad JCI-2010-08157
Drets:	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.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	PloS one, Vol. 8, Issue 7 (July 2013) , art. e70743, ISSN 1932-6203

DOI: 10.1371/journal.pone.0070743
PMID: 23936247

7 p, 2.1 MB

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