Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins
Bipedal locomotion is a hallmark of being human. Yet the body form from which bipedalism evolved remains unclear. Specifically, the positional behaviour (i.e. orthograde vs. pronograde) and the length of the lumbar spine (i.e. long and mobile vs. short and stiff) of the last common ancestor (LCA) of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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Cambridge University Press
2022-01-01
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| Series: | Evolutionary Human Sciences |
| Subjects: | |
| Online Access: | https://www.cambridge.org/core/product/identifier/S2513843X22000093/type/journal_article |
| _version_ | 1811156358451429376 |
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| author | Kyle H. Rosen Caroline E. Jones Jeremy M. DeSilva |
| author_facet | Kyle H. Rosen Caroline E. Jones Jeremy M. DeSilva |
| author_sort | Kyle H. Rosen |
| collection | DOAJ |
| description | Bipedal locomotion is a hallmark of being human. Yet the body form from which bipedalism evolved remains unclear. Specifically, the positional behaviour (i.e. orthograde vs. pronograde) and the length of the lumbar spine (i.e. long and mobile vs. short and stiff) of the last common ancestor (LCA) of the African great apes and humans require further investigation. While fossil evidence would be the most conclusive, the paucity of hominid fossils from 5–10 million years ago makes this field of research challenging. In their absence, extant primate anatomy and behaviour may offer some insight into the ancestral body form from which bipedalism could most easily evolve. Here, we quantify the frequency of bipedalism in a large sample (N = 496) of zoo-housed hominoids and cercopithecines. Our results show that while each studied species of ape and monkey can move bipedally, hylobatids are significantly more bipedal and engage in bipedal locomotion more frequently and for greater distances than any other primate sampled. These data support hypotheses of an orthograde, long-backed and arboreal LCA, which is consistent with hominoid fossils from the middle-to-late Miocene. If true, knuckle-walking evolved in parallel in Pan and Gorilla, and the human body form, particularly the long lower back and orthograde posture, is conserved. |
| first_indexed | 2024-04-10T04:50:11Z |
| format | Article |
| id | doaj.art-265cbbf1da314742963fc8f73e727815 |
| institution | Directory Open Access Journal |
| issn | 2513-843X |
| language | English |
| last_indexed | 2024-04-10T04:50:11Z |
| publishDate | 2022-01-01 |
| publisher | Cambridge University Press |
| record_format | Article |
| series | Evolutionary Human Sciences |
| spelling | doaj.art-265cbbf1da314742963fc8f73e7278152023-03-09T12:32:20ZengCambridge University PressEvolutionary Human Sciences2513-843X2022-01-01410.1017/ehs.2022.9Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal originsKyle H. Rosen0Caroline E. Jones1Jeremy M. DeSilva2https://orcid.org/0000-0001-7010-1155Department of Anthropology, Dartmouth College, 6047 Silsby Hall, Hanover, NH, USADepartment of Psychology, University of Georgia, 125 Baldwin Street, Athens, GA, USADepartment of Anthropology, Dartmouth College, 6047 Silsby Hall, Hanover, NH, USABipedal locomotion is a hallmark of being human. Yet the body form from which bipedalism evolved remains unclear. Specifically, the positional behaviour (i.e. orthograde vs. pronograde) and the length of the lumbar spine (i.e. long and mobile vs. short and stiff) of the last common ancestor (LCA) of the African great apes and humans require further investigation. While fossil evidence would be the most conclusive, the paucity of hominid fossils from 5–10 million years ago makes this field of research challenging. In their absence, extant primate anatomy and behaviour may offer some insight into the ancestral body form from which bipedalism could most easily evolve. Here, we quantify the frequency of bipedalism in a large sample (N = 496) of zoo-housed hominoids and cercopithecines. Our results show that while each studied species of ape and monkey can move bipedally, hylobatids are significantly more bipedal and engage in bipedal locomotion more frequently and for greater distances than any other primate sampled. These data support hypotheses of an orthograde, long-backed and arboreal LCA, which is consistent with hominoid fossils from the middle-to-late Miocene. If true, knuckle-walking evolved in parallel in Pan and Gorilla, and the human body form, particularly the long lower back and orthograde posture, is conserved.https://www.cambridge.org/core/product/identifier/S2513843X22000093/type/journal_articleBipedalismhominingibbonhominidhominoid |
| spellingShingle | Kyle H. Rosen Caroline E. Jones Jeremy M. DeSilva Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins Evolutionary Human Sciences Bipedalism hominin gibbon hominid hominoid |
| title | Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins |
| title_full | Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins |
| title_fullStr | Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins |
| title_full_unstemmed | Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins |
| title_short | Bipedal locomotion in zoo apes: Revisiting the hylobatian model for bipedal origins |
| title_sort | bipedal locomotion in zoo apes revisiting the hylobatian model for bipedal origins |
| topic | Bipedalism hominin gibbon hominid hominoid |
| url | https://www.cambridge.org/core/product/identifier/S2513843X22000093/type/journal_article |
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