Masses of cones of lodgepole pines (conemass) from
16 different habitat types (habitat) in western
North America.
Arguments
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.