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Evolution of Viviparity in Sceloporine Lizards: In Utero Po2 as a Developmental Constraint during Egg Retention
 

Summary: 581
Evolution of Viviparity in Sceloporine Lizards: In Utero Po2 as a
Developmental Constraint during Egg Retention
Scott L. Parker*
Robin M. Andrews
Department of Biological Sciences, Virginia Polytechnic
Institute and State University, Blacksburg, Virginia 24061-
0406
Accepted 11/1/2005; Electronically Published 4/5/2006
ABSTRACT
Reptilian viviparity evolves through selection for increasingly
prolonged egg retention within the oviduct. In the majority of
sceloporine lizard species, however, egg retention past the nor-
mal time of oviposition results in retarded or arrested embry-
onic development. In this study, we tested the hypothesis that
the amount of embryonic development normally attained in
utero is directly related to in utero oxygen partial pressure(Po2).
The three species of sceloporine lizards we used are character-
ized by developmental arrest (Urosaurus ornatus), retarded de-
velopment (Sceloporus virgatus), and normal development (Sce-

  

Source: Andrews, Robin - Department of Biological Sciences, Virginia Tech

 

Collections: Environmental Sciences and Ecology