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BIO FINAL: pt. 3
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competition
occurs when resources need to overlap
when fundamental niche spaces overlap
interspecific competition
competition between individuals of different species (or between species)
intraspecific competition
competition between individuals of the same species
mechanisms of competition
interference competition
exploitative competition
interference competition
direct attack on a competitor
ex. corals fight each other
exploitive competition
preventing competitor from accessing resources without attacking
competition exclusion principle
-whenever 2 species are competing for the same resource it will deplete faster
-the resource will not be enough for pop.
-the individual who can best use it will survive
-two species with identical or very similiar niche spaces can't live together indefinitely
-resource partitioning
resource partitioning
only way for species with similiar niche places to coexist
ways to resource partition
1. evolve or acclimate to use different resources
2. use similiar resources but at different times
3. use resources in different microhabitats
Connel barnacle experiment
Joe Connel switched barnacle species from upper and lower intertidal and found that competition with B prevents C from living in the lower intertidal
Wethey barnacle experiment
found that enviromental stress (temp. and dessication) prevents B from living in a higher intertidal
predation
+/-
positive interactions
facilitation; presence of one species benefits aother
symbiosis
close associations between species that have evolved
parisitism
parasite benefits and host is hurt (+/-)
commenalism
one organism benefits while the other isn't hurt or helped (+/-)
mutualism
when both organisms benefit (+/+)
keystone species
species that have a disproportionitely large impact on their community
low rate of disturbance=
monoculture of climax species
high rate of disturbance=
only bare rock
intermediate rate of disturbance=
patches at all different stages, maximizes the number of species
Author
hayesme
ID
17842
Card Set
BIO FINAL: pt. 3
Description
key terms and concepts
Updated
2010-05-05T03:20:43Z
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