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A biomechanical perspective on molar emergence and primate life history

The strong relationship between M1 emergence age and life history across primates provides a means of reconstructing fossil life history. The underlying process that leads to varying molar emergence schedules, however, remains elusive. Using three-dimensional data to quantify masticatory form in ont...

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Detalles Bibliográficos
Autores principales: Glowacka, Halszka, Schwartz, Gary T.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8494445/
https://www.ncbi.nlm.nih.gov/pubmed/34613774
http://dx.doi.org/10.1126/sciadv.abj0335
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author Glowacka, Halszka
Schwartz, Gary T.
author_facet Glowacka, Halszka
Schwartz, Gary T.
author_sort Glowacka, Halszka
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description The strong relationship between M1 emergence age and life history across primates provides a means of reconstructing fossil life history. The underlying process that leads to varying molar emergence schedules, however, remains elusive. Using three-dimensional data to quantify masticatory form in ontogenetic samples representing 21 primate species, we test the hypothesis that the location and timing of molar emergence are constrained to avoid potentially dangerous distractive forces at the temporomandibular joint (TMJ) throughout growth. We show that (i) molars emerge in a predictable position to safeguard the TMJ, (ii) the rate and duration of jaw growth determine the timing of molar emergence, and (iii) the rate and cessation age of jaw growth is related to life history. Thus, orofacial development is constrained by biomechanics throughout ontogeny. This integrative perspective on primate skull growth is consistent with a long sought-after causal explanation underlying the correlation between molar emergence and life history.
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spelling pubmed-84944452021-10-13 A biomechanical perspective on molar emergence and primate life history Glowacka, Halszka Schwartz, Gary T. Sci Adv Social and Interdisciplinary Sciences The strong relationship between M1 emergence age and life history across primates provides a means of reconstructing fossil life history. The underlying process that leads to varying molar emergence schedules, however, remains elusive. Using three-dimensional data to quantify masticatory form in ontogenetic samples representing 21 primate species, we test the hypothesis that the location and timing of molar emergence are constrained to avoid potentially dangerous distractive forces at the temporomandibular joint (TMJ) throughout growth. We show that (i) molars emerge in a predictable position to safeguard the TMJ, (ii) the rate and duration of jaw growth determine the timing of molar emergence, and (iii) the rate and cessation age of jaw growth is related to life history. Thus, orofacial development is constrained by biomechanics throughout ontogeny. This integrative perspective on primate skull growth is consistent with a long sought-after causal explanation underlying the correlation between molar emergence and life history. American Association for the Advancement of Science 2021-10-06 /pmc/articles/PMC8494445/ /pubmed/34613774 http://dx.doi.org/10.1126/sciadv.abj0335 Text en Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Social and Interdisciplinary Sciences
Glowacka, Halszka
Schwartz, Gary T.
A biomechanical perspective on molar emergence and primate life history
title A biomechanical perspective on molar emergence and primate life history
title_full A biomechanical perspective on molar emergence and primate life history
title_fullStr A biomechanical perspective on molar emergence and primate life history
title_full_unstemmed A biomechanical perspective on molar emergence and primate life history
title_short A biomechanical perspective on molar emergence and primate life history
title_sort biomechanical perspective on molar emergence and primate life history
topic Social and Interdisciplinary Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8494445/
https://www.ncbi.nlm.nih.gov/pubmed/34613774
http://dx.doi.org/10.1126/sciadv.abj0335
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