Evolution of viviparity in the lizard genus Sceloporus

According to the cold-climate model, viviparity in squamate reptiles evolves at high elevations and latitudes. The lizard genus Sceloporus has been used to support this model

Detalles Bibliográficos
Autores: Mendez-de la Cruz, FR, Villagran-Santa Cruz, M, Andrews, RM
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:1998
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Sistema de Información de la Facultad de Ciencias, UNAM
OAI Identifier:oai:repositorio.fciencias.unam.mx:11154/2695
Acceso en línea:http://hdl.handle.net/11154/2695
Access Level:acceso abierto
Palabra clave:Zoology
Sceloporus
reproductive cycles
evolution of viviparity
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spelling Evolution of viviparity in the lizard genus SceloporusMendez-de la Cruz, FRVillagran-Santa Cruz, MAndrews, RMZoologySceloporusreproductive cyclesevolution of viviparityAccording to the cold-climate model, viviparity in squamate reptiles evolves at high elevations and latitudes. The lizard genus Sceloporus has been used to support this modelviviparous species are found at higher elevations than oviparous species. For example, in the scalaris species group, a viviparous species replaces its oviparous sister species at elevations above 3000 m. We used recent literature to evaluate four aspects of the evolution of viviparity within the genus and concluded that (1) viviparity has evolved a minimum of four times within the genus. (2) Viviparity has not evolved at high latitudes, because the oviparous species found at high latitudes lack the morphological and physiological features that facilitate prolonged egg retention, the intermediate stage between oviparity and viviparity. (3) Viviparous species have not invaded high latitudes because viviparity in Sceloporus is associated with gestation during winter months. This is a viable reproductive mode at high elevations at tropical latitudes, because ambient temperatures during the winter are similar to those in the summer. At high latitudes, in contrast, winters may be too cold to support embryogenesis, or perhaps even survival of embryos. (4) Viviparity evolved from oviparity through three major transitions. The first was the evolution of viviparity from oviparitythis transition was associated with the invasion of high elevations. The second transition was a shift from summer to winter gestation such that birth was shifted from autumn to spring. With birth in the spring, neonates are able to mature by autumn, and consequently they can produce a litter within a year of their own birth. The third transition was a shift from asynchronous reproductive cycles of males and females (mating in spring and fertilization in autumn) to synchronous reproductive cycles (mating and fertilization in the autumn).2011-01-22T10:27:44Z2011-01-22T10:27:44Z1998info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article0018-0831http://hdl.handle.net/11154/2695274754(4):521-532reponame:Sistema de Información de la Facultad de Ciencias, UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenHerpetologicainfo:eu-repo/semantics/openAccessoai:repositorio.fciencias.unam.mx:11154/26952025-09-17T19:21:14Z
dc.title.none.fl_str_mv Evolution of viviparity in the lizard genus Sceloporus
title Evolution of viviparity in the lizard genus Sceloporus
spellingShingle Evolution of viviparity in the lizard genus Sceloporus
Mendez-de la Cruz, FR
Zoology
Sceloporus
reproductive cycles
evolution of viviparity
title_short Evolution of viviparity in the lizard genus Sceloporus
title_full Evolution of viviparity in the lizard genus Sceloporus
title_fullStr Evolution of viviparity in the lizard genus Sceloporus
title_full_unstemmed Evolution of viviparity in the lizard genus Sceloporus
title_sort Evolution of viviparity in the lizard genus Sceloporus
dc.creator.none.fl_str_mv Mendez-de la Cruz, FR
Villagran-Santa Cruz, M
Andrews, RM
author Mendez-de la Cruz, FR
author_facet Mendez-de la Cruz, FR
Villagran-Santa Cruz, M
Andrews, RM
author_role author
author2 Villagran-Santa Cruz, M
Andrews, RM
author2_role author
author
dc.subject.none.fl_str_mv Zoology
Sceloporus
reproductive cycles
evolution of viviparity
topic Zoology
Sceloporus
reproductive cycles
evolution of viviparity
description According to the cold-climate model, viviparity in squamate reptiles evolves at high elevations and latitudes. The lizard genus Sceloporus has been used to support this model
publishDate 1998
dc.date.none.fl_str_mv 1998
2011-01-22T10:27:44Z
2011-01-22T10:27:44Z
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 0018-0831
http://hdl.handle.net/11154/2695
2747
identifier_str_mv 0018-0831
2747
url http://hdl.handle.net/11154/2695
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv Herpetologica
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv 54(4):521-532
reponame:Sistema de Información de la Facultad de Ciencias, UNAM
instname:Universidad Nacional Autónoma de México
instacron:UNAM
instname_str Universidad Nacional Autónoma de México
instacron_str UNAM
institution UNAM
reponame_str Sistema de Información de la Facultad de Ciencias, UNAM
collection Sistema de Información de la Facultad de Ciencias, UNAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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