Relationship between canine dimorphism and mandibular morphology in the hamadryas baboon and the Japanese monkey.

IF 2.6 2区 地球科学 Q1 ANTHROPOLOGY
American journal of physical anthropology Pub Date : 2011-04-01 Epub Date: 2010-12-29 DOI:10.1002/ajpa.21449
Hitoshi Fukase
{"title":"Relationship between canine dimorphism and mandibular morphology in the hamadryas baboon and the Japanese monkey.","authors":"Hitoshi Fukase","doi":"10.1002/ajpa.21449","DOIUrl":null,"url":null,"abstract":"<p><p>To examine morphological interrelationships between canine size and mandibular corpus shape, inter-sex comparisons were made in the hamadryas baboon and the Japanese monkey, known to display extreme and moderate canine dimorphism, respectively. Results of adult comparisons showed that all mandibular dimensions were significantly larger in the males than in the females in both species. In the hamadryas baboon, the males also exhibited a higher ratio of anterior to posterior corpus height than the females. This sex difference in corpus shape was not significant in the Japanese monkey, indicating lack of involvement of canine dimorphism. Analysis of mandibular growth patterns in the hamadryas baboon demonstrated that significant sexual size difference did not occur before incisor eruption, and that the anteriorly high corpus of the adult male mandible was associated with a rapidly increasing symphyseal height after incisor eruption. It was also shown that the female canine started to erupt shortly after incisor eruption, while the forming male canine continued to stay near the mandibular base and developed further in size until eruption. The relative positions of the incisors kept shifting upwards even after eruption in the males, while they hardly changed in the females. It is therefore suggested that the prolonged development and size increase of the male canine is accompanied by further enlargement of the symphysis, resulting in the higher anterior corpus of the adult males compared to the adult females. The results thus indicate the importance of understanding the spatial relationships of the developing teeth in interpreting mandibular morphology.</p>","PeriodicalId":7587,"journal":{"name":"American journal of physical anthropology","volume":"144 4","pages":"607-16"},"PeriodicalIF":2.6000,"publicationDate":"2011-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/ajpa.21449","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"American journal of physical anthropology","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1002/ajpa.21449","RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2010/12/29 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"ANTHROPOLOGY","Score":null,"Total":0}
引用次数: 13

Abstract

To examine morphological interrelationships between canine size and mandibular corpus shape, inter-sex comparisons were made in the hamadryas baboon and the Japanese monkey, known to display extreme and moderate canine dimorphism, respectively. Results of adult comparisons showed that all mandibular dimensions were significantly larger in the males than in the females in both species. In the hamadryas baboon, the males also exhibited a higher ratio of anterior to posterior corpus height than the females. This sex difference in corpus shape was not significant in the Japanese monkey, indicating lack of involvement of canine dimorphism. Analysis of mandibular growth patterns in the hamadryas baboon demonstrated that significant sexual size difference did not occur before incisor eruption, and that the anteriorly high corpus of the adult male mandible was associated with a rapidly increasing symphyseal height after incisor eruption. It was also shown that the female canine started to erupt shortly after incisor eruption, while the forming male canine continued to stay near the mandibular base and developed further in size until eruption. The relative positions of the incisors kept shifting upwards even after eruption in the males, while they hardly changed in the females. It is therefore suggested that the prolonged development and size increase of the male canine is accompanied by further enlargement of the symphysis, resulting in the higher anterior corpus of the adult males compared to the adult females. The results thus indicate the importance of understanding the spatial relationships of the developing teeth in interpreting mandibular morphology.

倭狒狒和日本猴犬齿二型性与下颌形态的关系。
为了研究犬齿大小和下颌体形状之间的形态学关系,我们对分别表现出极端和中度犬齿二态性的hamadryas狒狒和日本猴进行了两性比较。成年比较的结果表明,在这两个物种中,雄性的所有下颌尺寸都明显大于雌性。在hamadryas狒狒中,雄性也表现出比雌性更高的前后体高度。这种语料库形状的性别差异在日本猴中不显着,表明缺乏犬类二态性的参与。对哈马德亚狒狒下颌骨生长模式的分析表明,在切牙出牙之前,两性之间没有明显的大小差异,成年雄性下颌骨的前高体与切牙出牙后联合骨高度的迅速增加有关。雌性犬齿在门牙出牙后不久就开始出牙,而正在发育的雄性犬齿继续停留在下颌基部附近并进一步发育,直到出牙。男性萌出后门牙的相对位置持续向上移动,而女性萌出后门牙的相对位置几乎没有变化。因此,雄性犬的长时间发育和体型增加伴随着联合关节的进一步扩大,导致成年雄性犬的前体高于成年雌性犬。因此,研究结果表明,了解发育中牙齿的空间关系在解释下颌形态学中的重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
CiteScore
4.80
自引率
0.00%
发文量
3
审稿时长
3-8 weeks
期刊介绍: The American Journal of Physical Anthropology (AJPA) is the official journal of the American Association of Physical Anthropologists. The Journal is published monthly in three quarterly volumes. In addition, two supplements appear on an annual basis, the Yearbook of Physical Anthropology, which publishes major review articles, and the Annual Meeting Issue, containing the Scientific Program of the Annual Meeting of the American Association of Physical Anthropologists and abstracts of posters and podium presentations. The Yearbook of Physical Anthropology has its own editor, appointed by the Association, and is handled independently of the AJPA. As measured by impact factor, the AJPA is among the top journals listed in the anthropology category by the Social Science Citation Index. The reputation of the AJPA as the leading publication in physical anthropology is built on its century-long record of publishing high quality scientific articles in a wide range of topics.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信