Vocabulary Review

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Vocabulary Review

• Ch 20
• Community Ecology

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A relationship between two species in which one
species, the predator, feeds on the other
species, the prey
Predation
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A relationship between two species in which both
species compete for limited resources such that
both species are negatively affected by the
relationship
Interspecific competition
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A relationship in which two different organisms
live in close association with each other
Symbiosis
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A relationship between two species in which one
species, the parasite, benefits from the other
species, the host, which is harmed
Parasitism
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A relationship between two species in which both
species benefit
Mutualism
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A relationship between two organisms in which one
organism benefits and the other is unaffected
Commensalism
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The number of different species in an area or
community
Species richness
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A measure of the relative abundance of each
species in an ecological community
Species evenness
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A pattern in which the number of species in an
area increases as the area increases
Species-area effect
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In ecology, an event that changes a community by
removing or destroying organisms or altering
resource availabilty
Disturbance
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The tendency of a community to maintain a
relatively constant structure
Stability
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A gradual process of change and replacement in a
community
Ecological succession
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Succession that begins in an area that previously
did not support life
Primary succession
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The process by which one community replaces
another community that has been partially or
totally destroyed
Secondary succession
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A species that colonizes an uninhabited area and
that starts an ecological cycle in which many
other species become established
Pioneer species
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A community that, after a process of ecological
succession, has reached a generally stable state
Climax community