Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)

Autores
Fernandez Blanco, María Victoria; Bona, Paula; Olivares, Adriana Itati; Desojo, Julia Brenda
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Caiman is one of the five extant genera of alligatorid crocodylians. While several quantitative and qualitative studies exist on morphological variation in the genus, little is known about ontogenetic effects. Here, we quantify ontogenetic variation in morphology for Caiman yacare and C. latirostris in a phylogenetic context. A linear regression analysis on twelve skull measurements of C. yacare and C. latirostris against a measure of size (the first axis of a PCA of all variables) showed high correlation coefficients (r2 =0.89–0.99) and negative allometry. Eight allometric trajectories showed common slopes at different intercepts, reflecting a common ontogenetic pattern of morphological growth fixed early in ontogeny. The anterior width of the snout and the posterior width of the skull table are suitable to discriminate between the two species. The relationship between snout width and snout length is isometric in C. latirostris while it is negatively allometric in C. yacare. These results confirm that the snout shape is a distinctive feature between species established early in ontogeny. The narrowing and lengthening of the snout in C. yacare during ontogeny results in adult forms widely represented in other extant taxa within the genus. The broader and shorter snout in C. latirostris is probably an autapomorphic feature of this species within Caimaninae.
Fil: Fernandez Blanco, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Bona, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Olivares, Adriana Itati. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Zoología; Argentina
Fil: Desojo, Julia Brenda. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentina
Materia
Allometry
Caiman Latirostris
Caiman Yacare
Cranial Variation
Ontogeny
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/50129
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)Fernandez Blanco, María VictoriaBona, PaulaOlivares, Adriana ItatiDesojo, Julia BrendaAllometryCaiman LatirostrisCaiman YacareCranial VariationOntogenyhttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1Caiman is one of the five extant genera of alligatorid crocodylians. While several quantitative and qualitative studies exist on morphological variation in the genus, little is known about ontogenetic effects. Here, we quantify ontogenetic variation in morphology for Caiman yacare and C. latirostris in a phylogenetic context. A linear regression analysis on twelve skull measurements of C. yacare and C. latirostris against a measure of size (the first axis of a PCA of all variables) showed high correlation coefficients (r2 =0.89–0.99) and negative allometry. Eight allometric trajectories showed common slopes at different intercepts, reflecting a common ontogenetic pattern of morphological growth fixed early in ontogeny. The anterior width of the snout and the posterior width of the skull table are suitable to discriminate between the two species. The relationship between snout width and snout length is isometric in C. latirostris while it is negatively allometric in C. yacare. These results confirm that the snout shape is a distinctive feature between species established early in ontogeny. The narrowing and lengthening of the snout in C. yacare during ontogeny results in adult forms widely represented in other extant taxa within the genus. The broader and shorter snout in C. latirostris is probably an autapomorphic feature of this species within Caimaninae.Fil: Fernandez Blanco, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; ArgentinaFil: Bona, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; ArgentinaFil: Olivares, Adriana Itati. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Zoología; ArgentinaFil: Desojo, Julia Brenda. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; ArgentinaBritish Herpetological Society2015-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/50129Fernandez Blanco, María Victoria; Bona, Paula; Olivares, Adriana Itati; Desojo, Julia Brenda; Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae); British Herpetological Society; Herpetological Journal; 25; 2; 4-2015; 65-730268-0130CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/www.ingentaconnect.com/contentone/bhs/thj/2015/00000025/00000002/art00001info:eu-repo/semantics/altIdentifier/url/https://www.thebhs.org/publications/the-herpetological-journal/volume-25-number-2-april-2015/773-01-ontogenetic-variation-in-the-skulls-of-i-caiman-i-the-case-of-i-caiman-latirostris-i-and-i-caiman-yacare-i-alligatoridae-caimaninaeinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T10:11:34Zoai:ri.conicet.gov.ar:11336/50129instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-03 10:11:35.246CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
title Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
spellingShingle Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
Fernandez Blanco, María Victoria
Allometry
Caiman Latirostris
Caiman Yacare
Cranial Variation
Ontogeny
title_short Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
title_full Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
title_fullStr Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
title_full_unstemmed Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
title_sort Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae)
dc.creator.none.fl_str_mv Fernandez Blanco, María Victoria
Bona, Paula
Olivares, Adriana Itati
Desojo, Julia Brenda
author Fernandez Blanco, María Victoria
author_facet Fernandez Blanco, María Victoria
Bona, Paula
Olivares, Adriana Itati
Desojo, Julia Brenda
author_role author
author2 Bona, Paula
Olivares, Adriana Itati
Desojo, Julia Brenda
author2_role author
author
author
dc.subject.none.fl_str_mv Allometry
Caiman Latirostris
Caiman Yacare
Cranial Variation
Ontogeny
topic Allometry
Caiman Latirostris
Caiman Yacare
Cranial Variation
Ontogeny
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Caiman is one of the five extant genera of alligatorid crocodylians. While several quantitative and qualitative studies exist on morphological variation in the genus, little is known about ontogenetic effects. Here, we quantify ontogenetic variation in morphology for Caiman yacare and C. latirostris in a phylogenetic context. A linear regression analysis on twelve skull measurements of C. yacare and C. latirostris against a measure of size (the first axis of a PCA of all variables) showed high correlation coefficients (r2 =0.89–0.99) and negative allometry. Eight allometric trajectories showed common slopes at different intercepts, reflecting a common ontogenetic pattern of morphological growth fixed early in ontogeny. The anterior width of the snout and the posterior width of the skull table are suitable to discriminate between the two species. The relationship between snout width and snout length is isometric in C. latirostris while it is negatively allometric in C. yacare. These results confirm that the snout shape is a distinctive feature between species established early in ontogeny. The narrowing and lengthening of the snout in C. yacare during ontogeny results in adult forms widely represented in other extant taxa within the genus. The broader and shorter snout in C. latirostris is probably an autapomorphic feature of this species within Caimaninae.
Fil: Fernandez Blanco, María Victoria. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Bona, Paula. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. División Paleontología Vertebrados; Argentina
Fil: Olivares, Adriana Itati. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata; Argentina. Universidad Nacional de La Plata. Facultad de Ciencias Naturales y Museo. Área Zoología; Argentina
Fil: Desojo, Julia Brenda. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales ; Argentina
description Caiman is one of the five extant genera of alligatorid crocodylians. While several quantitative and qualitative studies exist on morphological variation in the genus, little is known about ontogenetic effects. Here, we quantify ontogenetic variation in morphology for Caiman yacare and C. latirostris in a phylogenetic context. A linear regression analysis on twelve skull measurements of C. yacare and C. latirostris against a measure of size (the first axis of a PCA of all variables) showed high correlation coefficients (r2 =0.89–0.99) and negative allometry. Eight allometric trajectories showed common slopes at different intercepts, reflecting a common ontogenetic pattern of morphological growth fixed early in ontogeny. The anterior width of the snout and the posterior width of the skull table are suitable to discriminate between the two species. The relationship between snout width and snout length is isometric in C. latirostris while it is negatively allometric in C. yacare. These results confirm that the snout shape is a distinctive feature between species established early in ontogeny. The narrowing and lengthening of the snout in C. yacare during ontogeny results in adult forms widely represented in other extant taxa within the genus. The broader and shorter snout in C. latirostris is probably an autapomorphic feature of this species within Caimaninae.
publishDate 2015
dc.date.none.fl_str_mv 2015-04
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/50129
Fernandez Blanco, María Victoria; Bona, Paula; Olivares, Adriana Itati; Desojo, Julia Brenda; Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae); British Herpetological Society; Herpetological Journal; 25; 2; 4-2015; 65-73
0268-0130
CONICET Digital
CONICET
url http://hdl.handle.net/11336/50129
identifier_str_mv Fernandez Blanco, María Victoria; Bona, Paula; Olivares, Adriana Itati; Desojo, Julia Brenda; Ontogenetic variation in the skulls of Caiman: the case of Caiman latirostris and Caiman yacare (Alligatoridae, Caimaninae); British Herpetological Society; Herpetological Journal; 25; 2; 4-2015; 65-73
0268-0130
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/www.ingentaconnect.com/contentone/bhs/thj/2015/00000025/00000002/art00001
info:eu-repo/semantics/altIdentifier/url/https://www.thebhs.org/publications/the-herpetological-journal/volume-25-number-2-april-2015/773-01-ontogenetic-variation-in-the-skulls-of-i-caiman-i-the-case-of-i-caiman-latirostris-i-and-i-caiman-yacare-i-alligatoridae-caimaninae
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
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dc.publisher.none.fl_str_mv British Herpetological Society
publisher.none.fl_str_mv British Herpetological Society
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instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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