Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)

Detalhes bibliográficos
Autor(a) principal: Monteiro, Leandro R. [UNESP]
Data de Publicação: 1997
Outros Autores: Soares, Marcelo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://hdl.handle.net/11449/224054
Resumo: We studied ontogenetic variation in the shape of the skull among species of Caiman using principal component analysis. Comparison of multivariate allometric coefficients and ontogenetic trends between size and shape reveals that C. sclerops and C. yacare have similar ontogenetic processes, and they are more related to each other than either is to C. latirostris. Allometric relationships of the characters measured are similar in all species studied. The greater differences were in the width measurements, with higher coefficients in shape (second principal component) for C. latirostris, and length measurements with higher coefficients in shape for C. yacare and C. sclerops. The ontogenetic process leading to change in skull shape in the group seems to be plesiomorphic for elongation and derived for broadening. Statistical comparison of the ontogenetic trends with models of allometric heterochrony suggests that C. latirostris has diverged from the other species by a neotenic process, and that C. sclerops is separated from C yacare by ontogenetic scaling (progenesis).
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spelling Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)AllometryCaimanHeterochronySkull ontogenyWe studied ontogenetic variation in the shape of the skull among species of Caiman using principal component analysis. Comparison of multivariate allometric coefficients and ontogenetic trends between size and shape reveals that C. sclerops and C. yacare have similar ontogenetic processes, and they are more related to each other than either is to C. latirostris. Allometric relationships of the characters measured are similar in all species studied. The greater differences were in the width measurements, with higher coefficients in shape (second principal component) for C. latirostris, and length measurements with higher coefficients in shape for C. yacare and C. sclerops. The ontogenetic process leading to change in skull shape in the group seems to be plesiomorphic for elongation and derived for broadening. Statistical comparison of the ontogenetic trends with models of allometric heterochrony suggests that C. latirostris has diverged from the other species by a neotenic process, and that C. sclerops is separated from C yacare by ontogenetic scaling (progenesis).Depto. de Zoologia UNESP, caixa postal 199, cep: 13506-900, Rio Claro, SPSetor de Herpetologia Museu Nacional do Rio de Janeiro Quinta da Boa Vista, Rio de Janeiro, RJ cep: 20940-040Depto. de Zoologia UNESP, caixa postal 199, cep: 13506-900, Rio Claro, SPUniversidade Estadual Paulista (UNESP)Quinta da Boa VistaMonteiro, Leandro R. [UNESP]Soares, Marcelo2022-04-28T19:54:27Z2022-04-28T19:54:27Z1997-03-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article62-69Herpetologica, v. 53, n. 1, p. 62-69, 1997.0018-0831http://hdl.handle.net/11449/2240542-s2.0-0030899452Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengHerpetologicainfo:eu-repo/semantics/openAccess2022-04-28T19:54:28Zoai:repositorio.unesp.br:11449/224054Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462022-04-28T19:54:28Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
title Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
spellingShingle Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
Monteiro, Leandro R. [UNESP]
Allometry
Caiman
Heterochrony
Skull ontogeny
title_short Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
title_full Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
title_fullStr Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
title_full_unstemmed Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
title_sort Allometric analysis of the ontogenetic variation and evolution of the skull in Caiman spix, 1825 (Crocodylia: Alligatoridae)
author Monteiro, Leandro R. [UNESP]
author_facet Monteiro, Leandro R. [UNESP]
Soares, Marcelo
author_role author
author2 Soares, Marcelo
author2_role author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (UNESP)
Quinta da Boa Vista
dc.contributor.author.fl_str_mv Monteiro, Leandro R. [UNESP]
Soares, Marcelo
dc.subject.por.fl_str_mv Allometry
Caiman
Heterochrony
Skull ontogeny
topic Allometry
Caiman
Heterochrony
Skull ontogeny
description We studied ontogenetic variation in the shape of the skull among species of Caiman using principal component analysis. Comparison of multivariate allometric coefficients and ontogenetic trends between size and shape reveals that C. sclerops and C. yacare have similar ontogenetic processes, and they are more related to each other than either is to C. latirostris. Allometric relationships of the characters measured are similar in all species studied. The greater differences were in the width measurements, with higher coefficients in shape (second principal component) for C. latirostris, and length measurements with higher coefficients in shape for C. yacare and C. sclerops. The ontogenetic process leading to change in skull shape in the group seems to be plesiomorphic for elongation and derived for broadening. Statistical comparison of the ontogenetic trends with models of allometric heterochrony suggests that C. latirostris has diverged from the other species by a neotenic process, and that C. sclerops is separated from C yacare by ontogenetic scaling (progenesis).
publishDate 1997
dc.date.none.fl_str_mv 1997-03-01
2022-04-28T19:54:27Z
2022-04-28T19:54:27Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Herpetologica, v. 53, n. 1, p. 62-69, 1997.
0018-0831
http://hdl.handle.net/11449/224054
2-s2.0-0030899452
identifier_str_mv Herpetologica, v. 53, n. 1, p. 62-69, 1997.
0018-0831
2-s2.0-0030899452
url http://hdl.handle.net/11449/224054
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Herpetologica
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 62-69
dc.source.none.fl_str_mv Scopus
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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