Corpus ID: 12931327

A NEW HYPOTHESIS FOR THE EVOLUTION OF VIVIPARITY IN REPTILES

@inproceedings{SnrNpx2004ANH,
  title={A NEW HYPOTHESIS FOR THE EVOLUTION OF VIVIPARITY IN REPTILES},
  author={Rrcnlno SnrNpx},
  year={2004}
}
-Viviparity has evolved many times within squamate reptiles, mostly in cool climates, but the selective advantages ofuterine rctention of eggs remain obscure. Previous analyses have assumed that intrauterine incubation enhances ofrspring survival because of eady hatching or protection of the young in utero. I suggest instead that prclonged uterine retention directly enhances hatchling viability, because egSs iocubated at maternal body temperaturcs produce "better" hatchlings than do eggs… Expand
Potential targets for selection during the evolution of viviparity in cold-climate reptiles
TLDR
Different aspects of the phenotype are sensitive to incubation conditions at different stages of development; thus, the evolution of reptilian viviparity may have been driven by a succession of advantages that accrued at different levels of embryogenesis. Expand
An empirical test of the `predictability' hypothesis for the evolution of viviparity in reptiles
TLDR
It is concluded that critical assumptions of the ‘predictability’ hypothesis are not supported in this study system. Expand
Evolution of viviparity in warm‐climate lizards: an experimental test of the maternal manipulation hypothesis
The maternal manipulation hypothesis for the evolution of reptilian viviparity has been claimed to apply to any situation where gravid females are able to maintain body temperatures different fromExpand
Reproductive mode evolution in lizards revisited: updated analyses examining geographic, climatic and phylogenetic effects support the cold‐climate hypothesis
TLDR
This work compared nonphylogenetic and phylogenetic models predicting viviparity based on point‐of‐capture data from 20 994 museum specimens representing 215 lizard species in conjunction with spatially explicit bioclimatic and geographic data layers and found that maximum temperature of the warmest month (and, less commonly, elevation and maximumTemperature of the driest quarter) was frequently the best predictor of v Viviparity and showed an association consistent with the CCH. Expand
Altitudinal variation in egg retention and rates of embryonic development in oviparous Zootoca vivipara fits predictions from the cold‐climate model on the evolution of viviparity
TLDR
It is indicated that temperature is an environmental factor affecting the geographical distribution of different levels of egg retention in Z. vivipara, as predicted by the cold‐climate hypothesis on the evolution of v Viviparity. Expand
EVOLUTION OF VIVIPARITY: A PHYLOGENETIC TEST OF THE COLD‐CLIMATE HYPOTHESIS IN PHRYNOSOMATID LIZARDS
TLDR
This work investigates the evolution of viviparity in the lizard family Phrynosomatidae using GIS‐based environmental data, an extensive phylogeny, and recently developed comparative methods, finding significant relationships between v Viviparity and lower temperatures during the warmest (egg‐laying) season, strongly supporting the cold‐climate hypothesis. Expand
Thermal performance of squamate embryos with respect to climate, adult life history, and phylogeny
TLDR
Observations indicate that embryonic thermal physiology is adapted to large-scale environmental patterns, and that global climate change will impact embryonic development directly through impacts on nest temperature per se, as well as indirectlythrough impacts on the ability of gravid females to select suitable nest sites. Expand
Shift in Thermal Preferences of Female Oviparous Common Lizards During Egg Retention: Insights into the Evolution of Reptilian Viviparity
TLDR
It is suggested that the shift in female body temperature during pregnancy optimizes embryogenesis and hatchling phenotype by avoiding the negative effects of the high incubation temperatures preferred by non-gravid females. Expand
A global test of the cold‐climate hypothesis for the evolution of viviparity of squamate reptiles
TLDR
A global and biophysical model based comparison generally supports the cold‐climate hypothesis and finds that viviparity in cold climates appears beneficial primarily by shortening developmental time. Expand
Embryonic responses to variation in oviductal oxygen in the lizard Sceloporus undulatus from New Jersey and South Carolina, USA
Viviparity in reptiles is hypothesized to evolve in cold climates at high latitudes and high elevations through selection for progressively longer periods of egg retention. Oxygen consumption ofExpand
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