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dc.contributor.author
Chemisquy, Maria Amelia
dc.date.available
2018-05-28T14:25:54Z
dc.date.issued
2015-11
dc.identifier.citation
Chemisquy, Maria Amelia; Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae); Springer; Zoomorphology (Berlin. Print); 134; 4; 11-2015; 587-599
dc.identifier.issn
0720-213X
dc.identifier.uri
http://hdl.handle.net/11336/46222
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Springer
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Mouse Opossum
dc.subject
Ontogeny
dc.subject
Allometry
dc.subject
Heterochrony
dc.subject
Secual Dimorphism
dc.subject
Geometric Morphometrics
dc.subject.classification
Otras Ciencias Biológicas
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Peramorphic males and extreme sexual dimorphism in Monodelphis dimidiata (Didelphidae)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-05-24T14:23:55Z
dc.journal.volume
134
dc.journal.number
4
dc.journal.pagination
587-599
dc.journal.pais
Alemania
dc.journal.ciudad
Berlin
dc.description.fil
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
dc.journal.title
Zoomorphology (Berlin. Print)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://dx.doi.org/10.1007/s00435-015-0274-7
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://link.springer.com/article/10.1007%2Fs00435-015-0274-7
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