Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates

The taxonomy of fossil mammals is mostly based on dental characters as a consequence of the better preservation of teeth when comparing with other body parts. Paleogene South American native ungulates are well represented by teeth, and there are a large number of non-associated postcranial remains s...

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Detalles Bibliográficos
Autores principales: Lorente, Malena, Gelfo, Javier Nicolás
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Ungulados
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16902
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16902
record_format dspace
spelling I19-R120-10915-169022023-10-24T20:01:58Z http://sedici.unlp.edu.ar/handle/10915/16902 Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates Lorente, Malena Gelfo, Javier Nicolás 2010 2010 2011-04-13T03:00:00Z en Ciencias Naturales Paleontología Ungulados The taxonomy of fossil mammals is mostly based on dental characters as a consequence of the better preservation of teeth when comparing with other body parts. Paleogene South American native ungulates are well represented by teeth, and there are a large number of non-associated postcranial remains suspected to belong to them. Based on the high correlation between body mass and dental measurements, three different logarithmic equations have been proposed to assigned postcranial bones, particularly the astragalus, to the dental remains of native ungulates. These models considered the m2 area as a variable dependent or independent, and are: 1) Ln "m2 area" = -0.77 + 1.55 * Ln "astragalar length", based on 10 condylarths; 2) Ln "length of the trochlea" = -0.283 + 1.345 * Ln "m2 area", considering 6 condylarths and 2 litopterns; 3) Ln "length of the trochlea" = -0.970 + 1.698 * Ln (√m2 area), based on 10 condylarths. In these models neither the original measurements for building the equation nor the residual standard deviation, both necessary for making predictions and calculate probabilities, are available. In order to solve this problem, a new dataset of 15 different astragalar variables, and length and width of molar series, was made from 24 articulated skeletons of bunodont artiodactyls, perissodactyls and primates. As in previous models the "m2 area" is the best dental variable to use in correlations. In contrast, for the astragalus, the "width of the neck" shows better r values for the regressions and higher loadings in a PCA than "total length" or "trochlea length". The model fit to our database was calculated and the residuals used to produce a testable and predictable model to test previous re-association inferences. Sesiones libres Facultad de Ciencias Naturales y Museo Objeto de conferencia Resumen http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Ungulados
spellingShingle Ciencias Naturales
Paleontología
Ungulados
Lorente, Malena
Gelfo, Javier Nicolás
Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates
topic_facet Ciencias Naturales
Paleontología
Ungulados
description The taxonomy of fossil mammals is mostly based on dental characters as a consequence of the better preservation of teeth when comparing with other body parts. Paleogene South American native ungulates are well represented by teeth, and there are a large number of non-associated postcranial remains suspected to belong to them. Based on the high correlation between body mass and dental measurements, three different logarithmic equations have been proposed to assigned postcranial bones, particularly the astragalus, to the dental remains of native ungulates. These models considered the m2 area as a variable dependent or independent, and are: 1) Ln "m2 area" = -0.77 + 1.55 * Ln "astragalar length", based on 10 condylarths; 2) Ln "length of the trochlea" = -0.283 + 1.345 * Ln "m2 area", considering 6 condylarths and 2 litopterns; 3) Ln "length of the trochlea" = -0.970 + 1.698 * Ln (√m2 area), based on 10 condylarths. In these models neither the original measurements for building the equation nor the residual standard deviation, both necessary for making predictions and calculate probabilities, are available. In order to solve this problem, a new dataset of 15 different astragalar variables, and length and width of molar series, was made from 24 articulated skeletons of bunodont artiodactyls, perissodactyls and primates. As in previous models the "m2 area" is the best dental variable to use in correlations. In contrast, for the astragalus, the "width of the neck" shows better r values for the regressions and higher loadings in a PCA than "total length" or "trochlea length". The model fit to our database was calculated and the residuals used to produce a testable and predictable model to test previous re-association inferences.
format Objeto de conferencia
Resumen
author Lorente, Malena
Gelfo, Javier Nicolás
author_facet Lorente, Malena
Gelfo, Javier Nicolás
author_sort Lorente, Malena
title Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates
title_short Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates
title_full Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates
title_fullStr Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates
title_full_unstemmed Critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the South American Paleogene ungulates
title_sort critic analysis of regression equation models used to associate isolated postcranial bones and tooth remains: the case of the south american paleogene ungulates
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16902
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