Populations [ 77 



Fig. 5.1 I Distribution of individuals of the butterfly Eup/jf/c^rj/as 



cditha on Jasper Ridge in two successive years. The colony occurs in 



an island of grassland surrounded by chaparral. Each dot indicates the 



place of first capture of an individual. Letters refer to areas into 



which the colony has been arbitrarily divided for study. {From Ehrlich, 



1961, Science 134 and unpublished.) 



500 1,000 



1 I I I I I \ 



2,000 3,000 4,000 5,000 



— I I I I 



Feet 



