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Lecture 53

BIOL 1001 Lecture Notes - Lecture 53: Aposematism, Herbivore, Interspecific Competition

Course Code
BIOL 1001
Tamara Kelly

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March 27th Lecture Note Community
Interspecific Interactions
Mutualisms (+/+)
Mutualism is a common form of symbiosis
Both partners benefit, but not real cooperation
Just exploit each other for own benefits
All species interact with other species
- The are predator/prey or parasite/host
- +, -, 0 interactions-> forms complex web of associations
Interactions influence population size & distribution of other spp
Niche multi-dimensional habitat encompasses:
- Sum habitat requirements required for a spp survival & reproduction -> defined by both
abiotic (physical) & biotic factors
- Ecological role spp plays in a community
Niche Overlap-> Competition
Niche: habitat requirements
Niche: range of resources a species can use, conditions it can tolerate
When interspp competition occurs, there are 2 possible outcomes:
1. Competitive Exclusion (local extinction_
2. Niche Differentiation
Competitive Exclusion
How to Study Competitive in Nature: a tale of two barnacles
In natural habitats, adult chthamalids & balanus don’t coexist
Can live adjacent- b/c of niche differentiation
Interspecific interactions can limit natural populations
Everyone looses with competition b/c there are less resources that an individual recvieved on
find more resources at
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