Evolution of high tooth replacement rates in sauropod dinosaurs.

<h4>Background</h4>Tooth replacement rate can be calculated in extinct animals by counting incremental lines of deposition in tooth dentin. Calculating this rate in several taxa allows for the study of the evolution of tooth replacement rate. Sauropod dinosaurs, the largest terrestrial a...

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Autores principales:	Michael D D'Emic, John A Whitlock, Kathlyn M Smith, Daniel C Fisher, Jeffrey A Wilson
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/133a6bbb2f0348f89142da0f9a1e7c1c
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spelling	oai:doaj.org-article:133a6bbb2f0348f89142da0f9a1e7c1c2021-11-18T07:37:21ZEvolution of high tooth replacement rates in sauropod dinosaurs.1932-620310.1371/journal.pone.0069235https://doaj.org/article/133a6bbb2f0348f89142da0f9a1e7c1c2013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/23874921/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Tooth replacement rate can be calculated in extinct animals by counting incremental lines of deposition in tooth dentin. Calculating this rate in several taxa allows for the study of the evolution of tooth replacement rate. Sauropod dinosaurs, the largest terrestrial animals that ever evolved, exhibited a diversity of tooth sizes and shapes, but little is known about their tooth replacement rates.<h4>Methodology/principal findings</h4>We present tooth replacement rate, formation time, crown volume, total dentition volume, and enamel thickness for two coexisting but distantly related and morphologically disparate sauropod dinosaurs Camarasaurus and Diplodocus. Individual tooth formation time was determined by counting daily incremental lines in dentin. Tooth replacement rate is calculated as the difference between the number of days recorded in successive replacement teeth. Each tooth family in Camarasaurus has a maximum of three replacement teeth, whereas each Diplodocus tooth family has up to five. Tooth formation times are about 1.7 times longer in Camarasaurus than in Diplodocus (315 vs. 185 days). Average tooth replacement rate in Camarasaurus is about one tooth every 62 days versus about one tooth every 35 days in Diplodocus. Despite slower tooth replacement rates in Camarasaurus, the volumetric rate of Camarasaurus tooth replacement is 10 times faster than in Diplodocus because of its substantially greater tooth volumes. A novel method to estimate replacement rate was developed and applied to several other sauropodomorphs that we were not able to thin section.<h4>Conclusions/significance</h4>Differences in tooth replacement rate among sauropodomorphs likely reflect disparate feeding strategies and/or food choices, which would have facilitated the coexistence of these gigantic herbivores in one ecosystem. Early neosauropods are characterized by high tooth replacement rates (despite their large tooth size), and derived titanosaurs and diplodocoids independently evolved the highest known tooth replacement rates among archosaurs.Michael D D'EmicJohn A WhitlockKathlyn M SmithDaniel C FisherJeffrey A WilsonPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 7, p e69235 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Michael D D'Emic John A Whitlock Kathlyn M Smith Daniel C Fisher Jeffrey A Wilson Evolution of high tooth replacement rates in sauropod dinosaurs.
description	<h4>Background</h4>Tooth replacement rate can be calculated in extinct animals by counting incremental lines of deposition in tooth dentin. Calculating this rate in several taxa allows for the study of the evolution of tooth replacement rate. Sauropod dinosaurs, the largest terrestrial animals that ever evolved, exhibited a diversity of tooth sizes and shapes, but little is known about their tooth replacement rates.<h4>Methodology/principal findings</h4>We present tooth replacement rate, formation time, crown volume, total dentition volume, and enamel thickness for two coexisting but distantly related and morphologically disparate sauropod dinosaurs Camarasaurus and Diplodocus. Individual tooth formation time was determined by counting daily incremental lines in dentin. Tooth replacement rate is calculated as the difference between the number of days recorded in successive replacement teeth. Each tooth family in Camarasaurus has a maximum of three replacement teeth, whereas each Diplodocus tooth family has up to five. Tooth formation times are about 1.7 times longer in Camarasaurus than in Diplodocus (315 vs. 185 days). Average tooth replacement rate in Camarasaurus is about one tooth every 62 days versus about one tooth every 35 days in Diplodocus. Despite slower tooth replacement rates in Camarasaurus, the volumetric rate of Camarasaurus tooth replacement is 10 times faster than in Diplodocus because of its substantially greater tooth volumes. A novel method to estimate replacement rate was developed and applied to several other sauropodomorphs that we were not able to thin section.<h4>Conclusions/significance</h4>Differences in tooth replacement rate among sauropodomorphs likely reflect disparate feeding strategies and/or food choices, which would have facilitated the coexistence of these gigantic herbivores in one ecosystem. Early neosauropods are characterized by high tooth replacement rates (despite their large tooth size), and derived titanosaurs and diplodocoids independently evolved the highest known tooth replacement rates among archosaurs.
format	article
author	Michael D D'Emic John A Whitlock Kathlyn M Smith Daniel C Fisher Jeffrey A Wilson
author_facet	Michael D D'Emic John A Whitlock Kathlyn M Smith Daniel C Fisher Jeffrey A Wilson
author_sort	Michael D D'Emic
title	Evolution of high tooth replacement rates in sauropod dinosaurs.
title_short	Evolution of high tooth replacement rates in sauropod dinosaurs.
title_full	Evolution of high tooth replacement rates in sauropod dinosaurs.
title_fullStr	Evolution of high tooth replacement rates in sauropod dinosaurs.
title_full_unstemmed	Evolution of high tooth replacement rates in sauropod dinosaurs.
title_sort	evolution of high tooth replacement rates in sauropod dinosaurs.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/133a6bbb2f0348f89142da0f9a1e7c1c
work_keys_str_mv	AT michaelddemic evolutionofhightoothreplacementratesinsauropoddinosaurs AT johnawhitlock evolutionofhightoothreplacementratesinsauropoddinosaurs AT kathlynmsmith evolutionofhightoothreplacementratesinsauropoddinosaurs AT danielcfisher evolutionofhightoothreplacementratesinsauropoddinosaurs AT jeffreyawilson evolutionofhightoothreplacementratesinsauropoddinosaurs
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Evolution of high tooth replacement rates in sauropod dinosaurs.

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