Cargando…

Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case

Diagenetic distortion can be a major obstacle to collecting quantitative shape data on paleontological specimens, especially for three-dimensional geometric morphometric analysis. Here we utilize the recently -published algorithmic symmetrization method of fossil reconstruction and compare it to the...

Descripción completa

Detalles Bibliográficos
Autores principales: Tallman, Melissa, Amenta, Nina, Delson, Eric, Frost, Stephen R., Ghosh, Deboshmita, Klukkert, Zachary S., Morrow, Andrea, Sawyer, Gary J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4081112/
https://www.ncbi.nlm.nih.gov/pubmed/24992483
http://dx.doi.org/10.1371/journal.pone.0100833
_version_ 1782324068720050176
author Tallman, Melissa
Amenta, Nina
Delson, Eric
Frost, Stephen R.
Ghosh, Deboshmita
Klukkert, Zachary S.
Morrow, Andrea
Sawyer, Gary J.
author_facet Tallman, Melissa
Amenta, Nina
Delson, Eric
Frost, Stephen R.
Ghosh, Deboshmita
Klukkert, Zachary S.
Morrow, Andrea
Sawyer, Gary J.
author_sort Tallman, Melissa
collection PubMed
description Diagenetic distortion can be a major obstacle to collecting quantitative shape data on paleontological specimens, especially for three-dimensional geometric morphometric analysis. Here we utilize the recently -published algorithmic symmetrization method of fossil reconstruction and compare it to the more traditional reflection & averaging approach. In order to have an objective test of this method, five casts of a female cranium of Papio hamadryas kindae were manually deformed while the plaster hardened. These were subsequently “retrodeformed” using both algorithmic symmetrization and reflection & averaging and then compared to the original, undeformed specimen. We found that in all cases, algorithmic retrodeformation improved the shape of the deformed cranium and in four out of five cases, the algorithmically symmetrized crania were more similar in shape to the original crania than the reflected & averaged reconstructions. In three out of five cases, the difference between the algorithmically symmetrized crania and the original cranium could be contained within the magnitude of variation among individuals in a single subspecies of Papio. Instances of asymmetric distortion, such as breakage on one side, or bending in the axis of symmetry, were well handled, whereas symmetrical distortion remained uncorrected. This technique was further tested on a naturally deformed and fossilized cranium of Paradolichopithecus arvernensis. Results, based on a principal components analysis and Procrustes distances, showed that the algorithmically symmetrized Paradolichopithecus cranium was more similar to other, less-deformed crania from the same species than was the original. These results illustrate the efficacy of this method of retrodeformation by algorithmic symmetrization for the correction of asymmetrical distortion in fossils. Symmetrical distortion remains a problem for all currently developed methods of retrodeformation.
format Online
Article
Text
id pubmed-4081112
institution National Center for Biotechnology Information
language English
publishDate 2014
publisher Public Library of Science
record_format MEDLINE/PubMed
spelling pubmed-40811122014-07-10 Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case Tallman, Melissa Amenta, Nina Delson, Eric Frost, Stephen R. Ghosh, Deboshmita Klukkert, Zachary S. Morrow, Andrea Sawyer, Gary J. PLoS One Research Article Diagenetic distortion can be a major obstacle to collecting quantitative shape data on paleontological specimens, especially for three-dimensional geometric morphometric analysis. Here we utilize the recently -published algorithmic symmetrization method of fossil reconstruction and compare it to the more traditional reflection & averaging approach. In order to have an objective test of this method, five casts of a female cranium of Papio hamadryas kindae were manually deformed while the plaster hardened. These were subsequently “retrodeformed” using both algorithmic symmetrization and reflection & averaging and then compared to the original, undeformed specimen. We found that in all cases, algorithmic retrodeformation improved the shape of the deformed cranium and in four out of five cases, the algorithmically symmetrized crania were more similar in shape to the original crania than the reflected & averaged reconstructions. In three out of five cases, the difference between the algorithmically symmetrized crania and the original cranium could be contained within the magnitude of variation among individuals in a single subspecies of Papio. Instances of asymmetric distortion, such as breakage on one side, or bending in the axis of symmetry, were well handled, whereas symmetrical distortion remained uncorrected. This technique was further tested on a naturally deformed and fossilized cranium of Paradolichopithecus arvernensis. Results, based on a principal components analysis and Procrustes distances, showed that the algorithmically symmetrized Paradolichopithecus cranium was more similar to other, less-deformed crania from the same species than was the original. These results illustrate the efficacy of this method of retrodeformation by algorithmic symmetrization for the correction of asymmetrical distortion in fossils. Symmetrical distortion remains a problem for all currently developed methods of retrodeformation. Public Library of Science 2014-07-03 /pmc/articles/PMC4081112/ /pubmed/24992483 http://dx.doi.org/10.1371/journal.pone.0100833 Text en © 2014 Tallman et al http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Tallman, Melissa
Amenta, Nina
Delson, Eric
Frost, Stephen R.
Ghosh, Deboshmita
Klukkert, Zachary S.
Morrow, Andrea
Sawyer, Gary J.
Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case
title Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case
title_full Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case
title_fullStr Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case
title_full_unstemmed Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case
title_short Evaluation of a New Method of Fossil Retrodeformation by Algorithmic Symmetrization: Crania of Papionins (Primates, Cercopithecidae) as a Test Case
title_sort evaluation of a new method of fossil retrodeformation by algorithmic symmetrization: crania of papionins (primates, cercopithecidae) as a test case
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4081112/
https://www.ncbi.nlm.nih.gov/pubmed/24992483
http://dx.doi.org/10.1371/journal.pone.0100833
work_keys_str_mv AT tallmanmelissa evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT amentanina evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT delsoneric evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT froststephenr evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT ghoshdeboshmita evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT klukkertzacharys evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT morrowandrea evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase
AT sawyergaryj evaluationofanewmethodoffossilretrodeformationbyalgorithmicsymmetrizationcraniaofpapioninsprimatescercopithecidaeasatestcase