Explanation:

Ecotones often have a larger number of species and larger population densities than the communities on either side. This tendency for increased biodiversity within the ecotone is referred to as the "edge effect." Those species which occur primarily or most abundantly in the ecotones are called "edge" species. Although ecotones support an increase in density for some species, other species need interior habitat blocks to survive and show avoidance or poor survival on edges. An increase in anthropogenic fragmentation of landscapes creates more ecotones, which may result in an increased occurrence of edge species while simultaneously resulting in increased negative effects for interior species.