Roughgarden - p. 2 
In regard to the last point, he points out that A, cristatellus, the 
mesic lowland trunk-ground lizard of Puerto Rico, has a jaw length differing 
from its analogue in Hispaniola, A. cybotes, by less than 1 mm. This pattern 
is largely explainable in terms of present day environment. In contrast, the 
CV pattern cannot be explained on such a basis, Present day factors cannot 
explain why a. cristatellus of Puerto Rico should have a very low CV value 
relative to A. cybotes, even though it has almost the same jaw size. The 
data are i with prediction (3) that compression and release of BPC 
occurs more slowly than niche displacement, 
