Masses of cones of lodgepole pines (conemass) from 16 different
habitat types (habitat) in western North America.
Arguments
Format
A data frame with 16 observations on the following 4 variables.
habitat
a factor with levels: island
absent, island present, and mainland present
conemass
mass of cone
location
island
or mainland
squirrels
absent or
present
Source
Edelaar, P. and C.W. Benkman. 2006. Replicated population divergence
caused by localised coevolution? A test of three hypotheses in the Red
Crossbill-lodgepole pine system. Journal of Evolutionary Biology 19:
1651-1659.