Unit 3: Community Structure

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9 Terms

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Community Structure

Absolute and relative abundance of species in a community; which species are present.

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Three components of community structure…

Interspecific competition, predation, and disturbance.

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Keystone Species

Organism with strong impact on environment.

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Keystone Predator

Eats competitively dominant prey. 

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Examples of keystone species and predator…

Starfish and California Mussel

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Disturbance

A relatively discrete event in time that disrupts ecosystem, community or population structure and changes resources, substrate availability, or the physical environment.

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Abiotic Sources of Disturbance

Fire, hurricanes, ice storms, flash floods.

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Biotic Sources of Distubance

Disease, predation.

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Human-Caused Sources of Disturbance

Timber harvesting, road/bridge, construction.