E-mail addresses:
Xiao-Lin Chu:chuxl@mail.bnu.edu.cn;
Angus Buckling:A.J.Buckling@exeter.ac.uk;
Quan-Guo Zhang:zhangqg@bnu.edu.cn.
Running title: Enemies limit adaptation in edge habitats
Keywords: adaptation, coevolution, experimental evolution, gene flow, source-sink dynamics
Type: Letter