1. SPECIES INTERACTIONS pp

2. Species (organism)
Population
Community (interaction of different species)
Ecosystem
Biosphere

3. SYMBIOSIS
Close interactions between two (populations) of organisms

4. COMPETITION niches overlap due to limited resource
a) interspecific competition: two different
species use same food source
b) intraspecific competition: competition
within the same species (population)
- very intense because they have identical
requirements

5. c) competitive exclusion: one species gets food better and the other species dies out, moves, or switches to a new food source

6. d) character displacement: divergence of characteristics (i. e
d) character displacement: divergence of characteristics (i.e. beaks in finches)
e) resource partitioning: using specific parts of the same resource (i.e. trees)

8. PARASITISM Parasitism: +/- (but not killed)
EX. intestinal worms / humans
1. parasite: small and lives on or in the host
organism
2. weaken the host
3. evolutionary adaptation kept the host
healthy enough to allow parasite
reproduction

9. MUTUALISM AND COMMENSALISM
Mutualism: ( +/+) both benefit
EX. flowers/insect
Commenalism: (+/0) one benefits and one neutral
EX. Birds / trees