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Community Ecology
Chapter 53 Campbell 5th Edition
41
Biology
11th Grade
09/28/2010

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Term
community
Definition
assemblage of species living in the same area
Term
species richness
Definition
number of species a community contains
Term
relative abundance
Definition
number of organisms of each species
Term
species diversity
Definition
pertains to both the richness (# of different species) and abundance (# of each kind of species) present in a community
Term
individualistic hypothesis
Definition
a community is viewed as a chance assemblage of species found inthe same area because they happen to have similar abiotic requirements
Term
interactive hypothesis
Definition
a community is viewed as a assemblage of closely linked speces, locked into association by mandatory biotic interactions that cause the community to function as an integrated unit
Term
interspecific interactions
Definition
behavior that occurs between populations of different species living in a community
Term
coevolution
Definition
reciprocal evolutionary adaptations in two species whereas a change in one species acts as a selective force on another species and counteradaptation by the second species
Term
predation
Definition
predator eats a prey
Term
parasitism
Definition
parasites (type of predator) live on or in the hosts seldom killing them outright
Term
parasitoidism
Definition
insects lay eggs on living hosts. the larvae feed within the body of the host, eventually causing its death
Term
herbivory
Definition
animals eat plants (form of predation)
Term
cryptic coloration
Definition
camouflage
Term
aposematic coloration
Definition
brightly colored organisms in which the bright colors act as a warning sign to stay away
Term
mimicry
Definition
resemblance to another species
Term
Batesian mimicry
Definition
palatable or harmless species mimics an unpalatable or harmful species ex: viceroy & monarch
Term
Mullerian mimicry
Definition
two or more unpalatable, aposematically colored species resemble each other
Term
parasite
Definition
organism that derives its nourishment from another organism
Term
host
Definition
organism on which the parasite lives/feeds
Term
endoparasites
Definition
organism that lives within their host ex: tapeworm
Term
ectoparasite
Definition
organism that feeds on the external surface of another organism
Term
interspecific competition
Definition
competition between two or more species relying on the same limiting resource within a community
Term
interference competition
Definition
fighting over resources
Term
exploitative competition
Definition
consumption or use of similar resources
Term
competitive exclusion principle
Definition
two species with similar needs for the same limiting resources cannot coexist in the same place
Term
ecological niche
Definition
sum total of an organism's use of the biotic and abiotic resources in its environment
Term
fundamental niche
Definition
set of resources a population is theoretically capable of using under ideal circumstances.
Term
realized niche
Definition
resources a population actually uses
Term
resource partitioning
Definition
species consume slightly different foods or use other resources in slightly different ways
Term
character displacement
Definition
tendancy for characteristics to be more divergent in two populations of species living close together vs. separated geographically
Term
symbiosis
Definition
living together - close physical relationship between two organisms
Term
commensalism
Definition
symbiotic relationship where one partner benefits without significantly affecting the other
Term
mutualism
Definition
symbiotic relationship where both partners benefit from the relationship
Term
parasitism
Definition
symbiotic relationship in which one partner benefits and the other partner is harmed
Term
keystone species
Definition
a species that makes an unusually strong impact on community structure compared to its abundance
Term
stability
Definition
tendancy of a community to reach and maintain an equilibrium or relative constant condition in the face of disturbance
Term
disturbance
Definition
events, such as storms, fires, floods, droughts etc that damage communities
Term
ecological succession
Definition
transition in species composition over time
Term
primary succession
Definition
beginning from scratch - no soil formed such as after a volcanic eruption
Term
secondary succession
Definition
when an existing community has been cleared by a disturbance, but the soil remains
Term
biogeography
Definition
study of past and present distribution of individual species and entire communities
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