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J. theor. Biol. (1997) 185, 129135 00225193/97/050129 + 07 $25.00/0/jt960294 7 1997 Academic Press Limited
 

Summary: J. theor. Biol. (1997) 185, 129135
00225193/97/050129 + 07 $25.00/0/jt960294 7 1997 Academic Press Limited
LETTER TO THE EDITOR
The Evolution of Viviparity and Placentation Revisted
Most studies on the evolution of viviparity in
squamate reptiles have focused on one or more of the
following questions: (1) what selective force(s) are
involved in the transition from oviparity to viviparity?
(2) how does this transition occur (i.e., what changes
are involved)? and (3) how and when does
placentation evolve? In answer to the first of these
questions, most studies have implicated cold climates
(at high latitudes or high elevations) as the primary
selective force involved [see Shine (1985) for a review].
Recently, in a paper published in this journal, Daniel
Blackburn (1995) addressed the latter two of these
questions. Specifically, Dr Blackburn tested different
evolutionary models (saltation, gradualism, and
punctuated equilibrium) for the evolution of vivipar-
ity, and questioned whether placentation evolves

  

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

 

Collections: Environmental Sciences and Ecology