Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves

Domestic dogs stand out due to an enormous morphological variation of their skulls, which clearly surpasses the variation found in wolves. A frequent phenomenon among this variation is the occurrence of disproportions between skull modules which appear much more frequent and more pronounced in domes...

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Bibliographic Details
Main Author: Curth, Stefan
Other Authors: Fischer, Martin S., Kupczik, Kornelius, O'Higgins, Paul
Format: Doctoral or Postdoctoral Thesis
Language:English
Published: 2018
Subjects:
Online Access:https://doi.org/10.22032/dbt.34909
https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20180618-1142494
https://www.db-thueringen.de/receive/dbt_mods_00034909
https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00041104/disscurth.pdf
http://uri.gbv.de/document/gvk:ppn:1024678091
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spelling ftdbthueringen:oai:www.db-thueringen.de:dbt_mods_00034909 2024-04-07T07:51:44+00:00 Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves Curth, Stefan Fischer, Martin S. Kupczik, Kornelius O'Higgins, Paul 2018 78 Seiten https://doi.org/10.22032/dbt.34909 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20180618-1142494 https://www.db-thueringen.de/receive/dbt_mods_00034909 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00041104/disscurth.pdf http://uri.gbv.de/document/gvk:ppn:1024678091 eng eng https://doi.org/10.22032/dbt.34909 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20180618-1142494 https://www.db-thueringen.de/receive/dbt_mods_00034909 https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00041104/disscurth.pdf http://uri.gbv.de/document/gvk:ppn:1024678091 https://creativecommons.org/licenses/by/3.0/ info:eu-repo/semantics/openAccess thesis Doktorarbeit ddc:590 Tieranatomie -- Tiermorphologie dissertation Text doc-type:PhDThesis 2018 ftdbthueringen https://doi.org/10.22032/dbt.34909 2024-03-08T13:30:20Z Domestic dogs stand out due to an enormous morphological variation of their skulls, which clearly surpasses the variation found in wolves. A frequent phenomenon among this variation is the occurrence of disproportions between skull modules which appear much more frequent and more pronounced in domestic dogs than in wolves. This phenomenon led up to the hypothesis that the integration of the skull modules in domestic dogs is degraded when compared to the wolf. Moreover, it was hypothesized that the patterns of covariation of skull modules were altered through artificial selection. In a first study, this hypothesis was tested using geometric morphometrics on 196 CT scanned dog and wolf skulls. The results point to an unchanged integration strength of the skull modules in domestic dogs. Also the covariation pattern of skull modules is very similar to that of wolves. Through this surprising result, the hypothesis for a second study was formed. The temporomandibular joint of dogs is highly diverse when compared to the joint of wolves. The reasons for this phenomenon have not been explored before. If the high integration in the domestic dog skull does also apply to the temporomandibular joint, the shape of the joint should be predictable on the basis of skull geometry. Also this hypothesis was tested using geometric morphometrics with a sample of 274 CT scanned skulls. The results showed that certain characteristics of the temporomandibular joint can be traced back to overall skull geometry (foremost relative muzzle length, skull flexion and size). Exceptions from this pattern are frequent though, and dogs with very similar skulls can have differently formed jaw joints. This points to a certain degree of structural independence of the jaw joint from the rest of the skull. The observed covariation patterns closely resemble patterns found in primates and humans, other carnivores and even pigeons, which suggests a highly conserved developmental program. Doctoral or Postdoctoral Thesis Canis lupus Digital Library Thüringen
institution Open Polar
collection Digital Library Thüringen
op_collection_id ftdbthueringen
language English
topic thesis
Doktorarbeit
ddc:590
Tieranatomie -- Tiermorphologie
spellingShingle thesis
Doktorarbeit
ddc:590
Tieranatomie -- Tiermorphologie
Curth, Stefan
Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
topic_facet thesis
Doktorarbeit
ddc:590
Tieranatomie -- Tiermorphologie
description Domestic dogs stand out due to an enormous morphological variation of their skulls, which clearly surpasses the variation found in wolves. A frequent phenomenon among this variation is the occurrence of disproportions between skull modules which appear much more frequent and more pronounced in domestic dogs than in wolves. This phenomenon led up to the hypothesis that the integration of the skull modules in domestic dogs is degraded when compared to the wolf. Moreover, it was hypothesized that the patterns of covariation of skull modules were altered through artificial selection. In a first study, this hypothesis was tested using geometric morphometrics on 196 CT scanned dog and wolf skulls. The results point to an unchanged integration strength of the skull modules in domestic dogs. Also the covariation pattern of skull modules is very similar to that of wolves. Through this surprising result, the hypothesis for a second study was formed. The temporomandibular joint of dogs is highly diverse when compared to the joint of wolves. The reasons for this phenomenon have not been explored before. If the high integration in the domestic dog skull does also apply to the temporomandibular joint, the shape of the joint should be predictable on the basis of skull geometry. Also this hypothesis was tested using geometric morphometrics with a sample of 274 CT scanned skulls. The results showed that certain characteristics of the temporomandibular joint can be traced back to overall skull geometry (foremost relative muzzle length, skull flexion and size). Exceptions from this pattern are frequent though, and dogs with very similar skulls can have differently formed jaw joints. This points to a certain degree of structural independence of the jaw joint from the rest of the skull. The observed covariation patterns closely resemble patterns found in primates and humans, other carnivores and even pigeons, which suggests a highly conserved developmental program.
author2 Fischer, Martin S.
Kupczik, Kornelius
O'Higgins, Paul
format Doctoral or Postdoctoral Thesis
author Curth, Stefan
author_facet Curth, Stefan
author_sort Curth, Stefan
title Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
title_short Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
title_full Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
title_fullStr Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
title_full_unstemmed Modularity and integration in the skull of canis lupus (Linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
title_sort modularity and integration in the skull of canis lupus (linnaeus 1758): a geometric morphometrics study on domestic dogs and wolves
publishDate 2018
url https://doi.org/10.22032/dbt.34909
https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20180618-1142494
https://www.db-thueringen.de/receive/dbt_mods_00034909
https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00041104/disscurth.pdf
http://uri.gbv.de/document/gvk:ppn:1024678091
genre Canis lupus
genre_facet Canis lupus
op_relation https://doi.org/10.22032/dbt.34909
https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20180618-1142494
https://www.db-thueringen.de/receive/dbt_mods_00034909
https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00041104/disscurth.pdf
http://uri.gbv.de/document/gvk:ppn:1024678091
op_rights https://creativecommons.org/licenses/by/3.0/
info:eu-repo/semantics/openAccess
op_doi https://doi.org/10.22032/dbt.34909
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