Canine sexual dimorphism in<i>Ardipithecus ramidus</i>was nearly human-like
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- Gen Suwa
- The University Museum, The University of Tokyo, Tokyo 113-0033, Japan;
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- Tomohiko Sasaki
- The Kyoto University Museum, Kyoto University, Kyoto 606-8501, Japan;
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- Sileshi Semaw
- Centro Nacional de Investigación sobre la Evolución Humana, 09002 Burgos, Spain;
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- Michael J. Rogers
- Department of Anthropology, Southern Connecticut State University, New Haven, CT 06515;
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- Scott W. Simpson
- Department of Anatomy, Case Western Reserve University School of Medicine, Cleveland, OH 44106;
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- Yutaka Kunimatsu
- Department of Business Administration, Ryukoku University, Kyoto 612-8577, Japan;
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- Masato Nakatsukasa
- Laboratory of Physical Anthropology, Kyoto University, Kyoto 606-8502, Japan;
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- Reiko T. Kono
- Faculty of Letters, Keio University, Yokohama 223-8521, Japan;
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- Yingqi Zhang
- Key Laboratory of Vertebrate Evolution and Human Origins of Chinese Academy of Sciences, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing 100044, China;
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- Yonas Beyene
- French Center for Ethiopian Studies, Addis Ababa, Ethiopia;
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- Berhane Asfaw
- Rift Valley Research Service, Addis Ababa, Ethiopia;
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- Tim D. White
- Centro Nacional de Investigación sobre la Evolución Humana, 09002 Burgos, Spain;
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説明
<jats:title>Significance</jats:title><jats:p>Humans have the proportionately smallest male canines among all anthropoids and little canine sexual dimorphism. However, the evolutionary emergence of this defining condition remains unclear because until now we have lacked a reliable method of determining dimorphism in weakly dimorphic fossil species. Using a probability-based method we recently developed, we estimated canine size dimorphism in the ∼4.5 million-year-old<jats:italic>Ardipithecus ramidus</jats:italic>and found it to be weak and comparable to that of modern humans. Our analysis of >300 fossils spanning 6 million years shows that male canine size reduction occurred early in human evolution, broadly coincident with the adoption of bipedality. This suggests a profound and evolutionarily deep sociobehavioral shift that minimized male–male aggression, most likely mediated by female choice.</jats:p>
収録刊行物
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- Proceedings of the National Academy of Sciences
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Proceedings of the National Academy of Sciences 118 (49), 2021-12
Proceedings of the National Academy of Sciences
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詳細情報 詳細情報について
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- CRID
- 1360857593686787200
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- ISSN
- 10916490
- 00278424
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
- OpenAIRE