文章基本信息

标题：Egg retention and intrauterine embryonic development in Sceloporus aeneus (Reptilia: Phrynosomatidae): implications for the evolution of viviparity
本地全文：下载
作者：Rodolfo García-Collazo ; Maricela Villagrán-Santa Cruz ; Eduardo Morales-Guillaumin 等
期刊名称：Revista Mexicana de Biodiversidad
印刷版ISSN：1870-3453
出版年度：2012
卷号：83
期号：3
出版社：Instituto de Biología
摘要：Egg retention (ER) and intrauterine embryonic development (IED) have been considered intermediate steps in the evolution from oviparity to viviparity. Sceloporus aeneus is an oviparous lizard that is closely related to the viviparous species (Sceloporus bicanthalis). The present study addresses the following 2 questions: 1) Are intermediate stages of egg retention (ER and IED) present in populations of Sceloporus aeneus? and 2) Are ER and/or IED explained by elevation, precipitation or phylogenetic effects? Results indicate that in S. aeneus, ER differs among populations. ER was negatively related to altitude and pluvial precipitation, whereas average environmental temperature had no effect on ER or IER. In contrast to previous observations of oviparous species related to viviparous species, populations of S. aeneus with advanced IED are associated with environmental factors such as low elevation and aridity instead of high elevation and cold climate, whereas the comparative analysis shows that there are no significative evolutionary changes throughout the phylogeny, which means that the altitude has no effect on the transition to the evolution of viviparity in S. aeneus-S bicanthalis.
关键词：reproductive mode;oviparity-viviparity evolution;environmental factors