Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)

Autores
Chemisquy, Maria Amelia
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The southern short-tailed opossum, Monodelphisdimidiata, is a species known not only for its semelparouslife cycle, but also for the extreme sexualdimorphism of adults, where males are not only larger, butalso have distinctive morphological characters in theirskull. Using geometric morphometrics and a suite of statisticaltests, I analyzed the postweaning ontogeneticdevelopment of this species in order to evaluate the ageclasswhere sexual dimorphism becomes significant and theamount of change exhibited by both sexes. My resultsshowed that M. dimidiata partly follows the ontogeneticpattern described for didelphids by previous authors. Thecharacter that escapes the general pattern is rostral length,which becomes shorter instead of lengthening throughoutthe development. This change could be related to anincrement in the bite force in the anterior part of the dentition.The amount of sexual dimorphism found for thisspecies is larger than the reported previously for otherAmerican marsupials, and I also found a higher rate ofgrowth in males at the attaining of sexual maturity. Basedon my results and the information available for otherdidelphids, I can suggest that M. dimidiata males undergothrough a process of hypermorphosis, resulting in aperamorphic condition. It is possible that the extremesexual dimorphism present in this species is related toreproductive success, specially taking into account theirsemelparous life cycle.
Fil: Chemisquy, Maria Amelia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
Materia
Mouse Opossum
Ontogeny
Allometry
Heterochrony
Secual Dimorphism
Geometric Morphometrics
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:11336/46222
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/46222
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)Chemisquy, Maria AmeliaMouse OpossumOntogenyAllometryHeterochronySecual DimorphismGeometric Morphometricshttps://purl.org/becyt/ford/1.6https://purl.org/becyt/ford/1The southern short-tailed opossum, Monodelphisdimidiata, is a species known not only for its semelparouslife cycle, but also for the extreme sexualdimorphism of adults, where males are not only larger, butalso have distinctive morphological characters in theirskull. Using geometric morphometrics and a suite of statisticaltests, I analyzed the postweaning ontogeneticdevelopment of this species in order to evaluate the ageclasswhere sexual dimorphism becomes significant and theamount of change exhibited by both sexes. My resultsshowed that M. dimidiata partly follows the ontogeneticpattern described for didelphids by previous authors. Thecharacter that escapes the general pattern is rostral length,which becomes shorter instead of lengthening throughoutthe development. This change could be related to anincrement in the bite force in the anterior part of the dentition.The amount of sexual dimorphism found for thisspecies is larger than the reported previously for otherAmerican marsupials, and I also found a higher rate ofgrowth in males at the attaining of sexual maturity. Basedon my results and the information available for otherdidelphids, I can suggest that M. dimidiata males undergothrough a process of hypermorphosis, resulting in aperamorphic condition. It is possible that the extremesexual dimorphism present in this species is related toreproductive success, specially taking into account theirsemelparous life cycle.Fil: Chemisquy, Maria Amelia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; ArgentinaSpringer2015-11info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/46222Chemisquy, Maria Amelia; Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae); Springer; Zoomorphology (Berlin. Print); 134; 4; 11-2015; 587-5990720-213XCONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1007/s00435-015-0274-7info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00435-015-0274-7info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-03T09:51:22Zoai:ri.conicet.gov.ar:11336/46222instacron: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 09:51:22.598CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
title Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
spellingShingle Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
Chemisquy, Maria Amelia
Mouse Opossum
Ontogeny
Allometry
Heterochrony
Secual Dimorphism
Geometric Morphometrics
title_short Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
title_full Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
title_fullStr Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
title_full_unstemmed Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
title_sort Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
dc.creator.none.fl_str_mv Chemisquy, Maria Amelia
author Chemisquy, Maria Amelia
author_facet Chemisquy, Maria Amelia
author_role author
dc.subject.none.fl_str_mv Mouse Opossum
Ontogeny
Allometry
Heterochrony
Secual Dimorphism
Geometric Morphometrics
topic Mouse Opossum
Ontogeny
Allometry
Heterochrony
Secual Dimorphism
Geometric Morphometrics
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.6
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The southern short-tailed opossum, Monodelphisdimidiata, is a species known not only for its semelparouslife cycle, but also for the extreme sexualdimorphism of adults, where males are not only larger, butalso have distinctive morphological characters in theirskull. Using geometric morphometrics and a suite of statisticaltests, I analyzed the postweaning ontogeneticdevelopment of this species in order to evaluate the ageclasswhere sexual dimorphism becomes significant and theamount of change exhibited by both sexes. My resultsshowed that M. dimidiata partly follows the ontogeneticpattern described for didelphids by previous authors. Thecharacter that escapes the general pattern is rostral length,which becomes shorter instead of lengthening throughoutthe development. This change could be related to anincrement in the bite force in the anterior part of the dentition.The amount of sexual dimorphism found for thisspecies is larger than the reported previously for otherAmerican marsupials, and I also found a higher rate ofgrowth in males at the attaining of sexual maturity. Basedon my results and the information available for otherdidelphids, I can suggest that M. dimidiata males undergothrough a process of hypermorphosis, resulting in aperamorphic condition. It is possible that the extremesexual dimorphism present in this species is related toreproductive success, specially taking into account theirsemelparous life cycle.
Fil: Chemisquy, Maria Amelia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentina
description The southern short-tailed opossum, Monodelphisdimidiata, is a species known not only for its semelparouslife cycle, but also for the extreme sexualdimorphism of adults, where males are not only larger, butalso have distinctive morphological characters in theirskull. Using geometric morphometrics and a suite of statisticaltests, I analyzed the postweaning ontogeneticdevelopment of this species in order to evaluate the ageclasswhere sexual dimorphism becomes significant and theamount of change exhibited by both sexes. My resultsshowed that M. dimidiata partly follows the ontogeneticpattern described for didelphids by previous authors. Thecharacter that escapes the general pattern is rostral length,which becomes shorter instead of lengthening throughoutthe development. This change could be related to anincrement in the bite force in the anterior part of the dentition.The amount of sexual dimorphism found for thisspecies is larger than the reported previously for otherAmerican marsupials, and I also found a higher rate ofgrowth in males at the attaining of sexual maturity. Basedon my results and the information available for otherdidelphids, I can suggest that M. dimidiata males undergothrough a process of hypermorphosis, resulting in aperamorphic condition. It is possible that the extremesexual dimorphism present in this species is related toreproductive success, specially taking into account theirsemelparous life cycle.
publishDate 2015
dc.date.none.fl_str_mv 2015-11
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/11336/46222
Chemisquy, Maria Amelia; Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae); Springer; Zoomorphology (Berlin. Print); 134; 4; 11-2015; 587-599
0720-213X
CONICET Digital
CONICET
url http://hdl.handle.net/11336/46222
identifier_str_mv Chemisquy, Maria Amelia; Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae); Springer; Zoomorphology (Berlin. Print); 134; 4; 11-2015; 587-599
0720-213X
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1007/s00435-015-0274-7
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00435-015-0274-7
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Springer
publisher.none.fl_str_mv Springer
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
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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score 13.13397

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