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Modeling Olfactory Bulb Evolution through Primate Phylogeny

Adaptive characterizations of primates have usually included a reduction in olfactory sensitivity. However, this inference of derivation and directionality assumes an ancestral state of olfaction, usually by comparison to a group of extant non-primate mammals. Thus, the accuracy of the inference dep...

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Autor principal: Heritage, Steven
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2014
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4245229/
https://www.ncbi.nlm.nih.gov/pubmed/25426851
http://dx.doi.org/10.1371/journal.pone.0113904
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author Heritage, Steven
author_facet Heritage, Steven
author_sort Heritage, Steven
collection PubMed
description Adaptive characterizations of primates have usually included a reduction in olfactory sensitivity. However, this inference of derivation and directionality assumes an ancestral state of olfaction, usually by comparison to a group of extant non-primate mammals. Thus, the accuracy of the inference depends on the assumed ancestral state. Here I present a phylogenetic model of continuous trait evolution that reconstructs olfactory bulb volumes for ancestral nodes of primates and mammal outgroups. Parent-daughter comparisons suggest that, relative to the ancestral euarchontan, the crown-primate node is plesiomorphic and that derived reduction in olfactory sensitivity is an attribute of the haplorhine lineage. The model also suggests a derived increase in olfactory sensitivity at the strepsirrhine node. This oppositional diversification of the strepsirrhine and haplorhine lineages from an intermediate and non-derived ancestor is inconsistent with a characterization of graded reduction through primate evolution.
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spelling pubmed-42452292014-12-05 Modeling Olfactory Bulb Evolution through Primate Phylogeny Heritage, Steven PLoS One Research Article Adaptive characterizations of primates have usually included a reduction in olfactory sensitivity. However, this inference of derivation and directionality assumes an ancestral state of olfaction, usually by comparison to a group of extant non-primate mammals. Thus, the accuracy of the inference depends on the assumed ancestral state. Here I present a phylogenetic model of continuous trait evolution that reconstructs olfactory bulb volumes for ancestral nodes of primates and mammal outgroups. Parent-daughter comparisons suggest that, relative to the ancestral euarchontan, the crown-primate node is plesiomorphic and that derived reduction in olfactory sensitivity is an attribute of the haplorhine lineage. The model also suggests a derived increase in olfactory sensitivity at the strepsirrhine node. This oppositional diversification of the strepsirrhine and haplorhine lineages from an intermediate and non-derived ancestor is inconsistent with a characterization of graded reduction through primate evolution. Public Library of Science 2014-11-26 /pmc/articles/PMC4245229/ /pubmed/25426851 http://dx.doi.org/10.1371/journal.pone.0113904 Text en © 2014 Steven Heritage 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
Heritage, Steven
Modeling Olfactory Bulb Evolution through Primate Phylogeny
title Modeling Olfactory Bulb Evolution through Primate Phylogeny
title_full Modeling Olfactory Bulb Evolution through Primate Phylogeny
title_fullStr Modeling Olfactory Bulb Evolution through Primate Phylogeny
title_full_unstemmed Modeling Olfactory Bulb Evolution through Primate Phylogeny
title_short Modeling Olfactory Bulb Evolution through Primate Phylogeny
title_sort modeling olfactory bulb evolution through primate phylogeny
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4245229/
https://www.ncbi.nlm.nih.gov/pubmed/25426851
http://dx.doi.org/10.1371/journal.pone.0113904
work_keys_str_mv AT heritagesteven modelingolfactorybulbevolutionthroughprimatephylogeny