1. Warm up 3/28 What are Density-independent factors? Give 2 examples What are Density-dependent factors? Give 2 examples

2. SPECIES INTERACTIONS pp. 399-404

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

4. SYMBIOSIS close interactions between two (populations) of organisms

5. 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

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

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

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

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

11. Homework Read pp. 399-404 Problem p 404 # 1-7 Trifold Vocab: (Due Tuesday) –Separate Sheet Interspecific Competition Intraspecific Competition Mutualism Commensalism Symbiosis Species Richness Species Evenness Primary Species Pioneer Species Monday Will Collect: Notebooks Warm-ups Will Check 2 nd worksheet from Thursday.

12. Homework Read pp. 399-404 Problem p 404 # 1-7