Two species of bivalve mollusk occupy the Scottish coast. Species A is found above high tide mark while Species B is found in the intertidal zone. If Species B is experimentally removed from the study site, Species A colonizes the area previously occupied by Species B. In the natural ecosystem, restriction of Species A to the area above high tide is an example of:

MCQs on the interactions among organisms and their environment that influence and regulate population size. Covers forms of intrinsic population growth and factors affecting that growth, ecological relationships, and the means through which populations can be managed to maintain species and biodiversity.