APES Unit 2

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species richness :

The number of different species in a community.

Relative abundance:

The number of how many individuals are present for each species.

Ecology:

study of living organisms in their nonliving world

Biotic factor:

living item (ex: bacteria)

Abiotic factor:

not living item (ex: rock)

Ecosystem service:

the many and varied benefits to humans gifted by the natural environment and from healthy ecosystems.

Range of Tolerance:

range of environmental conditions that are tolerable for survival in a species

Competitive Exclusion Principle:

species with the same niche in the same area cannot coexist

Keystone Species:

often a dominant predator whose removal allows a prey population to explode and often decreases overall diversity. Ex: sea otter