Edge effect: Edge effects refer to the changes in population or community structures that occur at the boundary of two habitats.
Trophic cascade: A trophic cascade is an ecological phenomenon triggered by the addition or removal of top predators and involving reciprocal changes in the relative population of Predator and prey through a food chain which often results in drastic changes in ecosystem structure and nutrient cycling.
Dieback: Dieback refers to the progressive death of a plant, usually from the tip of any portion of the plant. It is a condition in which a tree or shrub begins to die from the tip of its leaves or roots backward, owing to disease or an unfavourable environment.