Canine sexual dimorphism in Ardipithecus ramidus was nearly human-like

doi:10.1073/pnas.2116630118

IVPP-IR > 中科院古脊椎所（2000年以后）

	Canine sexual dimorphism in Ardipithecus ramidus was nearly human-like
	Suwa, Gen 1; Sasaki, Tomohiko 2; Semaw, Sileshi 3,4; Rogers, Michael J.5; Simpson, Scott W.6; Kunimatsu, Yutaka 7; Nakatsukasa, Masato 8; Kono, Reiko T.9; Zhang, Yingqi 10; Beyene, Yonas 11; Asfaw, Berhane 12; White, Tim D.3,13
	2021-12-07
发表期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN	0027-8424
卷号	118 期号:49 页码:11
通讯作者	Suwa, Gen(gsuwa@um.u-tokyo.ac.jp)
摘要	Body and canine size dimorphism in fossils inform sociobehavioral hypotheses on human evolution and have been of interest since Darwin's famous reflections on the subject. Here, we assemble a large dataset of fossil canines of the human clade, including all available Ardipithecus ramidus fossils recovered from the Middle Awash and Gona research areas in Ethiopia, and systematically examine canine dimorphism through evolutionary time. In particular, we apply a Bayesian probabilistic method that reduces bias when estimating weak and moderate levels of dimorphism. Our results show that Ar. ramidus canine dimorphism was significantly weaker than in the bonobo, the least dimorphic and behaviorally least aggressive among extant great apes. Average male-to-female size ratios of the canine in Ar. ramidus are estimated as 1.06 and 1.13 in the upper and lower canines, respectively, within modern human population ranges of variation. The slightly greater magnitude of canine size dimorphism in the lower than in the upper canines of Ar. ramidus appears to be shared with early Australopithecus, suggesting that male canine reduction was initially more advanced in the behaviorally important upper canine. The available fossil evidence suggests a drastic size reduction of the male canine prior to Ar. ramidus and the earliest known members of the human clade, with little change in canine dimorphism levels thereafter. This evolutionary pattern indicates a profound behavioral shift associated with comparatively weak levels of male aggression early in human evolution, a pattern that was subsequently shared by Australopithecus and Homo.
关键词	canine dimorphism Bayesian estimate Ardipithecus ramidus Australopithecus Homo
DOI	10.1073/pnas.2116630118
关键词[WOS]	MONKEYS BRACHYTELES-ARACHNOIDES ; EARLY HOMINID ; LATE MIOCENE ; MIDDLE AWASH ; AUSTRALOPITHECUS-ANAMENSIS ; POLYMORPHIC ASPECTS ; ANTERIOR DENTITION ; LUKEINO FORMATION ; SIZE DIMORPHISM ; PROJECT AREA
收录类别	SCI
语种	英语
资助项目	Japan Society for the Promotion of Science (Kakenhi)[24000015] ; Japan Society for the Promotion of Science (Kakenhi)[18H04007] ; L. S. B. Leakey Foundation ; European Union ; NSF[SBR-9910974] ; NSF[RHOI BCS 0321893] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB26000000]
项目资助者	Japan Society for the Promotion of Science (Kakenhi) ; L. S. B. Leakey Foundation ; European Union ; NSF ; Strategic Priority Research Program of the Chinese Academy of Sciences
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000730583000017
出版者	NATL ACAD SCIENCES
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/19125
专题	中科院古脊椎所（2000年以后）
通讯作者	Suwa, Gen
作者单位	1.Univ Tokyo, Univ Museum, Tokyo 1130033, Japan 2.Kyoto Univ, Kyoto Univ Museum, Kyoto 6068501, Japan 3.Ctr Nacl Invest Evoluc Humana, Burgos 09002, Spain 4.Stone Age Inst, Gosport, IN 47408 USA 5.Southern Connecticut State Univ, Dept Anthropol, New Haven, CT 06515 USA 6.Case Western Reserve Univ, Dept Anat, Sch Med, Cleveland, OH 44106 USA 7.Ryukoku Univ, Dept Business Adm, Kyoto 6128577, Japan 8.Kyoto Univ, Lab Phys Anthropol, Kyoto 6068502, Japan 9.Keio Univ, Fac Letters, Yokohama, Kanagawa 2238521, Japan 10.Chinese Acad Sci, Key Lab Vertebrate Evolut & Human Origins, Inst Vertebrate Paleontol & Paleoanthropol, Beijing 100044, Peoples R China 11.French Ctr Ethiopian Studies, Addis Ababa, Ethiopia 12.Rift Valley Res Serv, Addis Ababa, Ethiopia 13.Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA
推荐引用方式 GB/T 7714	Suwa, Gen,Sasaki, Tomohiko,Semaw, Sileshi,et al. Canine sexual dimorphism in Ardipithecus ramidus was nearly human-like[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2021,118(49):11.
APA	Suwa, Gen.,Sasaki, Tomohiko.,Semaw, Sileshi.,Rogers, Michael J..,Simpson, Scott W..,...&White, Tim D..(2021).Canine sexual dimorphism in Ardipithecus ramidus was nearly human-like.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,118(49),11.
MLA	Suwa, Gen,et al."Canine sexual dimorphism in Ardipithecus ramidus was nearly human-like".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 118.49(2021):11.