双齿有袋类动物不断生长的门齿记录着年龄和生活史

IF 2.2 4区 医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE
William M.G. Parker , Justin W. Adams , Eliza J. Campbell , Graeme Coulson , Gordon D. Sanson , Alistair R. Evans
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引用次数: 0

摘要

目的牙齿的生长和磨损是确定哺乳动物年龄的常用工具。有袋类中最特殊的类群--双齿兽,其下颌有一对平卧的门齿。本研究对这对门齿的生长和磨损情况进行了研究,以了解它们与年龄和性别的关系。设计对巨齿类(袋鼠和小袋鼠)的两个姊妹物种--巨齿象和巨齿虎进行了下颌门齿齿冠和齿根长度的测量。组织学分析研究了这些牙齿的牙本质和骨水泥沉积模式。结果 在巨齿类样本中,这些门齿的半齿性使得对其生长(齿根长度)和磨损(齿冠长度)的测量成为年龄和性别的准确指标。模型拟合结果表明,牙根的生长在整个生命周期中都是按照对数函数进行的,而牙冠的磨损在两个巨足类动物中都是按照指数减少的模式进行的。组织学结果发现,继发性牙本质沉积和骨水泥层是年龄的进一步指标。结论从形态学和显微结构上看,双齿兽门齿是研究年代年龄和性别的有用工具。这一发现对种群生态学、古生物学和有袋类的进化具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evergrowing incisors of diprotodont marsupials record age and life history

Objective

Tooth growth and wear are commonly used tools for determining the age of mammals. The most speciose order of marsupials, Diprotodontia, is characterised by a pair of procumbent incisors within the lower jaw. This study examines the growth and wear of these incisors to understand their relationship with age and sex.

Design

Measurements of mandibular incisor crown and root length were made for two sister species of macropodid (kangaroos and wallabies); Macropus giganteus and Macropus fuliginosus. Histological analysis examined patterns of dentine and cementum deposition within these teeth. Broader generalisability within Diprotodontia was tested using dentally reduced Tarsipes rostratus – a species disparate in body size and incisor function to the studied macropodids.

Results

In the macropodid sample it is demonstrated that the hypsodont nature of these incisors makes measurements of their growth (root length) and wear (crown length) accurate indicators of age and sex. Model fitting finds that root growth proceeds according to a logarithmic function across the lifespan, while crown wear follows a pattern of exponential reduction for both macropodid species. Histological results find that secondary dentine deposition and cementum layering are further indicators of age. Incisor measurements are shown to correlate with age in the sample of T. rostratus.

Conclusions

The diprotodontian incisor is a useful tool for examining chronological age and sex, both morphologically and microstructurally. This finding has implications for population ecology, palaeontology and marsupial evolution.

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来源期刊
Archives of oral biology
Archives of oral biology 医学-牙科与口腔外科
CiteScore
5.10
自引率
3.30%
发文量
177
审稿时长
26 days
期刊介绍: Archives of Oral Biology is an international journal which aims to publish papers of the highest scientific quality in the oral and craniofacial sciences. The journal is particularly interested in research which advances knowledge in the mechanisms of craniofacial development and disease, including: Cell and molecular biology Molecular genetics Immunology Pathogenesis Cellular microbiology Embryology Syndromology Forensic dentistry
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