Edge Effect

(1) The influence of one adjoining plant community upon the margin of another affecting the composition and density of the populations. cf. ecotone (2) The effect executed by adjoining communities on the population structure within the margin zone. (3) The attraction of such an area to animals.

Source
Society for Range Management. 1998. Glossary of terms used in range management, fourth edition. Edited by the Glossary Update Task Group, Thomas E. Bedell, Chairman. Used with permission.