|Community||Two or more populations of different species occupying the same geographical area|
|• Community Ecology||The study of how different species interact within communities|
|• Habitat||The physical place where an organism lives, e.g. a pine forest or fresh water lake.
(Some organisms, particularly migratory birds require more than one habitat)
|• Niche||The functional role of an organism in a community, its job or position|
|Potential niche||What a species could do with no competitors or resource limitations|
|Realized niche||The part of the fundamental niche that a species actually occupies in nature. (What a species really does due to competition and/or resource limitations)|
|• Neutral species interaction||Two species that don't interact at all.
|• Commensalism||Beneficial to one species but neutral to another (birds that nest in trees, epiphytes (plants that grow on other plants)
|• Mutualism||Beneficial to both species(plants and their pollinators)
|• Parasitism||Benefits one species and is detrimental to another. (Note that the host is generally not killed)
|• Predation||Beneficial to one species and detrimental to another. In this case the prey is killed and eaten.
|? Intraspecific competition||Competition among individuals of the same species|
|? Interspecific competition||Competition between different species|
|? The Theory of Competitive Exclusion||Species who utilize the same resources cannot coexist indefinitely – the "one niche, one species" concept.|
|? Resource partitioning||The resources are divided, permitting species with similar requirements to use the same resources in different areas, ways and/or times.|