Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism
- Autores
- Loza, Cleopatra Mara; Scarano, Alejo Carlos; Soibelzon, Leopoldo Héctor; Negrete, Javier; Carlini, Alfredo Armando
- Año de publicación
- 2015
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The auditory region of pinnipeds has seldom been described. Here we describe and analyze the ontogenetic trajectory of the tympanic bulla of the southern elephant seal, Mirounga leonina (Phocidae, Mammalia). This species is extremely sexually dimorphic and highly polygynous (organized in harems). We examined 118 specimens, arranged in three age classes (CI, CII, and CIII), ranging from newborn to adults (males and females). To analyze the overall size and shape of the tympanic bulla we performed a geometric morphometric analysis including 87 skulls. Females reach definitive shape and size of the bulla at earlier ontogenetic stages than males, in agreement with their earlier involvement in reproductive activities. The internal anatomy of the tympanic region (e.g. form and extension of the paries) does not show remarkable differences between sexes or age classes. The greatest differences between age classes are related to bone thickness, resulting from the apposition of new annual layers. An examination of possible sex-related external differences among age classes shows significant shape differences between males and females in CIII. The morphology observed in neonates is conserved across all individuals from CI, which included specimens up to 1 year old. Clear morphological differences were observed between CI individuals, on one hand, and CII individuals plus CIII females on the other. During cranial development of both male and females, the glenoid cavity expands and compresses the bulla; this condition reaches its maximum expression in CIII males. CIII males showed the greatest morphological differences, with respect to both CI and CII individuals, and CIII females.
Facultad de Ciencias Naturales y Museo - Materia
-
Ciencias Naturales
dimorphism
ear region
ontogeny
southern elephant seal - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/127189
Ver los metadatos del registro completo
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Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphismLoza, Cleopatra MaraScarano, Alejo CarlosSoibelzon, Leopoldo HéctorNegrete, JavierCarlini, Alfredo ArmandoCiencias Naturalesdimorphismear regionontogenysouthern elephant sealThe auditory region of pinnipeds has seldom been described. Here we describe and analyze the ontogenetic trajectory of the tympanic bulla of the southern elephant seal, <i>Mirounga leonina</i> (Phocidae, Mammalia). This species is extremely sexually dimorphic and highly polygynous (organized in harems). We examined 118 specimens, arranged in three age classes (CI, CII, and CIII), ranging from newborn to adults (males and females). To analyze the overall size and shape of the tympanic bulla we performed a geometric morphometric analysis including 87 skulls. Females reach definitive shape and size of the bulla at earlier ontogenetic stages than males, in agreement with their earlier involvement in reproductive activities. The internal anatomy of the tympanic region (e.g. form and extension of the <i>paries</i>) does not show remarkable differences between sexes or age classes. The greatest differences between age classes are related to bone thickness, resulting from the apposition of new annual layers. An examination of possible sex-related external differences among age classes shows significant shape differences between males and females in CIII. The morphology observed in neonates is conserved across all individuals from CI, which included specimens up to 1 year old. Clear morphological differences were observed between CI individuals, on one hand, and CII individuals plus CIII females on the other. During cranial development of both male and females, the glenoid cavity expands and compresses the bulla; this condition reaches its maximum expression in CIII males. CIII males showed the greatest morphological differences, with respect to both CI and CII individuals, and CIII females.Facultad de Ciencias Naturales y Museo2015-04info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf354-372http://sedici.unlp.edu.ar/handle/10915/127189enginfo:eu-repo/semantics/altIdentifier/issn/1469-7580info:eu-repo/semantics/altIdentifier/issn/0021-8782info:eu-repo/semantics/altIdentifier/pmid/25827162info:eu-repo/semantics/altIdentifier/doi/10.1111/joa.12286info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-03T11:02:44Zoai:sedici.unlp.edu.ar:10915/127189Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-03 11:02:44.86SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
title |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
spellingShingle |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism Loza, Cleopatra Mara Ciencias Naturales dimorphism ear region ontogeny southern elephant seal |
title_short |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
title_full |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
title_fullStr |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
title_full_unstemmed |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
title_sort |
Morphology of the tympanic-basicranial region in <i>Mirounga leonina</i> (Phocidae, Carnivora), postnatal ontogeny and sexual dimorphism |
dc.creator.none.fl_str_mv |
Loza, Cleopatra Mara Scarano, Alejo Carlos Soibelzon, Leopoldo Héctor Negrete, Javier Carlini, Alfredo Armando |
author |
Loza, Cleopatra Mara |
author_facet |
Loza, Cleopatra Mara Scarano, Alejo Carlos Soibelzon, Leopoldo Héctor Negrete, Javier Carlini, Alfredo Armando |
author_role |
author |
author2 |
Scarano, Alejo Carlos Soibelzon, Leopoldo Héctor Negrete, Javier Carlini, Alfredo Armando |
author2_role |
author author author author |
dc.subject.none.fl_str_mv |
Ciencias Naturales dimorphism ear region ontogeny southern elephant seal |
topic |
Ciencias Naturales dimorphism ear region ontogeny southern elephant seal |
dc.description.none.fl_txt_mv |
The auditory region of pinnipeds has seldom been described. Here we describe and analyze the ontogenetic trajectory of the tympanic bulla of the southern elephant seal, <i>Mirounga leonina</i> (Phocidae, Mammalia). This species is extremely sexually dimorphic and highly polygynous (organized in harems). We examined 118 specimens, arranged in three age classes (CI, CII, and CIII), ranging from newborn to adults (males and females). To analyze the overall size and shape of the tympanic bulla we performed a geometric morphometric analysis including 87 skulls. Females reach definitive shape and size of the bulla at earlier ontogenetic stages than males, in agreement with their earlier involvement in reproductive activities. The internal anatomy of the tympanic region (e.g. form and extension of the <i>paries</i>) does not show remarkable differences between sexes or age classes. The greatest differences between age classes are related to bone thickness, resulting from the apposition of new annual layers. An examination of possible sex-related external differences among age classes shows significant shape differences between males and females in CIII. The morphology observed in neonates is conserved across all individuals from CI, which included specimens up to 1 year old. Clear morphological differences were observed between CI individuals, on one hand, and CII individuals plus CIII females on the other. During cranial development of both male and females, the glenoid cavity expands and compresses the bulla; this condition reaches its maximum expression in CIII males. CIII males showed the greatest morphological differences, with respect to both CI and CII individuals, and CIII females. Facultad de Ciencias Naturales y Museo |
description |
The auditory region of pinnipeds has seldom been described. Here we describe and analyze the ontogenetic trajectory of the tympanic bulla of the southern elephant seal, <i>Mirounga leonina</i> (Phocidae, Mammalia). This species is extremely sexually dimorphic and highly polygynous (organized in harems). We examined 118 specimens, arranged in three age classes (CI, CII, and CIII), ranging from newborn to adults (males and females). To analyze the overall size and shape of the tympanic bulla we performed a geometric morphometric analysis including 87 skulls. Females reach definitive shape and size of the bulla at earlier ontogenetic stages than males, in agreement with their earlier involvement in reproductive activities. The internal anatomy of the tympanic region (e.g. form and extension of the <i>paries</i>) does not show remarkable differences between sexes or age classes. The greatest differences between age classes are related to bone thickness, resulting from the apposition of new annual layers. An examination of possible sex-related external differences among age classes shows significant shape differences between males and females in CIII. The morphology observed in neonates is conserved across all individuals from CI, which included specimens up to 1 year old. Clear morphological differences were observed between CI individuals, on one hand, and CII individuals plus CIII females on the other. During cranial development of both male and females, the glenoid cavity expands and compresses the bulla; this condition reaches its maximum expression in CIII males. CIII males showed the greatest morphological differences, with respect to both CI and CII individuals, and CIII females. |
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 Articulo 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://sedici.unlp.edu.ar/handle/10915/127189 |
url |
http://sedici.unlp.edu.ar/handle/10915/127189 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
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info:eu-repo/semantics/altIdentifier/issn/1469-7580 info:eu-repo/semantics/altIdentifier/issn/0021-8782 info:eu-repo/semantics/altIdentifier/pmid/25827162 info:eu-repo/semantics/altIdentifier/doi/10.1111/joa.12286 |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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application/pdf 354-372 |
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