Commercial Extinction Population decline of a wild species , that is used as a resource , to a level at that it is no longer profitable to harvest the species. Common-Property Resource Resource that individuals are usually free to use and normally owned by no one. Examples include air, fish in parts of the ocean or lakes, migratory birds, gases of the lower atmosphere, and radiation from the sun. Community Refers to all the populations of interacting species found in a specific area or region at a certain time. Community Boundary Spatial edge of a unique community .
Competition can occur at the interspecific or intraspecific biotic levels.
Competitive Exclusion Situation where no two competitively interacting species can occupy exactly the same fundamental niche indefinitely because of resource limitations. The outcome of this process is the local extinction the species that is a poorer competitor. Common examples of these flowering plants are thistles, dandelion, and sunflowers. Compound A compound is the atoms of different elements joined together. Concrete Space Actual geographic space in the real world.