You are not currently logged in.
Access JSTOR through your library or other institution:
If You Use a Screen ReaderThis content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Reanalysis of the Evolution of Viviparity and Egg-Guarding in Squamate Reptiles
Richard Shine and Michael S. Y. Lee
Vol. 55, No. 4 (Dec., 1999), pp. 538-549
Stable URL: http://www.jstor.org/stable/3893320
Page Count: 12
You can always find the topics here!Topics: Ovipary, Taxa, Animal vivipary, Phylogeny, Lizards, Snakes, Evolution, Herpetology, Phylogenetics, Biological taxonomies
Were these topics helpful?See something inaccurate? Let us know!
Select the topics that are inaccurate.
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Preview not available
A recent publication (de Fraipont, Clobert, and Barbault-Evolution 50:391-400, 1996) reached two heterodox conclusions concerning the evolution of reproductive modes in squamate reptiles. Firstly, "reversals" from viviparity back to oviparity have been almost as frequent as "forward transitions" of oviparity to viviparity. Secondly, maternal egg-guarding has not facilitated the evolution of viviparity. However, methodological problems in the analysis make these conclusions tenuous. In particular, the analysis (1) relied upon poorly supported (as well as strongly supported) transitions, (2) counted particular transitions more than once, (3) placed too much emphasis on differences between very distantly related higher taxa, and (4) contained consistent biases in the raw data, so that many egg-guarding taxa must have been incorrectly scored as lacking egg-guarding. A reanalysis of the (family-level) data reveals little support for reversals from viviparity back to oviparity while the relationship (if any) between egg-guarding and viviparity cannot be ascertained without additional data.
Herpetologica © 1999 Herpetologists' League