The Evolution of Live-Bearing in Lizards and Snakes
- 1 June 1979
- journal article
- research article
- Published by University of Chicago Press in The American Naturalist
- Vol. 113 (6), 905-923
- https://doi.org/10.1086/283444
Abstract
Most reptiles lay eggs, but many lizards and snakes give birth to live young by retaining the eggs within the oviducts until birth. The origin of live-bearing in reptiles is investigated here by posing a theoretical model and testing the model with published data. Predictions are (1) that live-bearing should evolve in cold environments and (2) that maternal care of the eggs facilitates the evolution of live-bearing. Analyses of data from over 1,000 species of lizards and snakes reveal that live-bearing has evolved recently at least 38 times, and an additional 60 species show the intermediate evolutionary stages (egg retention). Tests of these data support the predictions: Species which have recently evolved live-bearing or show the intermediate stages are much more likely to be found in cold climates or have maternal care of eggs than are squamates in general. The presentation in this paper differs from those of most earlier workers in distinguishing the cases in which live-bearing arises from the cases in which a live-bearing species radiates and invades new habitats.This publication has 7 references indexed in Scilit:
- Natural Selection and Sex Change in Pandalid Shrimp: Test of a Life-History TheoryThe American Naturalist, 1979
- Climatic correlates of live-bearing in squamate reptilesOecologia, 1978
- Reproduction in Australian elapid snakes II. Female reproductive cyclesAustralian Journal of Zoology, 1977
- Life-History Tactics: A Review of the IdeasThe Quarterly Review of Biology, 1976
- The Influence of Ambient Temperature and Aridity on Modes of Reproduction and Excretion of Amniote VertebratesThe American Naturalist, 1966
- Body Temperatures of ReptilesThe American Midland Naturalist, 1965
- ON BIOLOGY OF VENOMOUS SNAKES OF ISRAEL .2.1965