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Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches

In a previous study, we estimated the cranial disparity of turtles (Testudinata) through time using geometric morphometric data from both terminal taxa and hypothetical ancestors to compensate for temporal gaps in the fossil record. While this method yielded reasonable results for the Mesozoic and t...

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Detalles Bibliográficos
Autores principales: Foth, Christian, Ascarrunz, Eduardo, Joyce, Walter G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society Publishing 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5717657/
https://www.ncbi.nlm.nih.gov/pubmed/29291083
http://dx.doi.org/10.1098/rsos.170899
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author Foth, Christian
Ascarrunz, Eduardo
Joyce, Walter G.
author_facet Foth, Christian
Ascarrunz, Eduardo
Joyce, Walter G.
author_sort Foth, Christian
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description In a previous study, we estimated the cranial disparity of turtles (Testudinata) through time using geometric morphometric data from both terminal taxa and hypothetical ancestors to compensate for temporal gaps in the fossil record. While this method yielded reasonable results for the Mesozoic and the early Cenozoic, we found a large drop in cranial disparity for the Miocene, for which we found no correlation with known environmental changes or extinction events. Instead, we speculated that the Miocene dip was a result of poor sampling of fossils or ancestors in this time bin. To countervail this problem, we here updated our original dataset and interpolated changes of shape along the branch lengths and compared them with the previous data. We furthermore explored the impact of topological and temporal uncertainty, demonstrating that the Miocene dip, indeed, is a sampling artefact. All remaining conclusions of the previous study could be more or less supported, nevertheless, including an apparent correlation with global biogeographic events, a minor correlation between cranial disparity and global temperature, and resilience across the K/T extinction event.
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spelling pubmed-57176572017-12-29 Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches Foth, Christian Ascarrunz, Eduardo Joyce, Walter G. R Soc Open Sci Earth Science In a previous study, we estimated the cranial disparity of turtles (Testudinata) through time using geometric morphometric data from both terminal taxa and hypothetical ancestors to compensate for temporal gaps in the fossil record. While this method yielded reasonable results for the Mesozoic and the early Cenozoic, we found a large drop in cranial disparity for the Miocene, for which we found no correlation with known environmental changes or extinction events. Instead, we speculated that the Miocene dip was a result of poor sampling of fossils or ancestors in this time bin. To countervail this problem, we here updated our original dataset and interpolated changes of shape along the branch lengths and compared them with the previous data. We furthermore explored the impact of topological and temporal uncertainty, demonstrating that the Miocene dip, indeed, is a sampling artefact. All remaining conclusions of the previous study could be more or less supported, nevertheless, including an apparent correlation with global biogeographic events, a minor correlation between cranial disparity and global temperature, and resilience across the K/T extinction event. The Royal Society Publishing 2017-11-29 /pmc/articles/PMC5717657/ /pubmed/29291083 http://dx.doi.org/10.1098/rsos.170899 Text en © 2017 The Authors. http://creativecommons.org/licenses/by/4.0/ Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.
spellingShingle Earth Science
Foth, Christian
Ascarrunz, Eduardo
Joyce, Walter G.
Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
title Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
title_full Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
title_fullStr Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
title_full_unstemmed Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
title_short Still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
title_sort still slow, but even steadier: an update on the evolution of turtle cranial disparity interpolating shapes along branches
topic Earth Science
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5717657/
https://www.ncbi.nlm.nih.gov/pubmed/29291083
http://dx.doi.org/10.1098/rsos.170899
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