Reconstructing an adaptationist scenario: what selective forces favor the evolution of viviparity in montane reptiles?

  title={Reconstructing an adaptationist scenario: what selective forces favor the evolution of viviparity in montane reptiles?},
  author={Richard Shine},
  journal={The American naturalist},
  volume={160 5},
It is notoriously difficult to test hypotheses about the selective forces responsible for major phylogenetic transitions in life-history traits, but the evolution of viviparity (live bearing) in reptiles offers an ideal model system. Viviparity has arisen in many oviparous reptile lineages that have invaded colder climates. Thermal advantages (eggs retained within the mother's body will be warmer than those laid in the nest) are almost certainly important, but the actual selective pressures… CONTINUE READING

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