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
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/127189

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network_name_str SEDICI (UNLP)
spelling 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
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info:ar-repo/semantics/articulo
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status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/127189
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dc.language.none.fl_str_mv eng
language eng
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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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rights_invalid_str_mv 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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repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
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