Warm up 3/28

• What are Density-independent factors? Give 2 examples

What are Density-dependent factors? Give 2 examples

SPECIES INTERACTIONS

pp. 399-404

Species (organism)

Population

Community (interaction of different species)

Ecosystem

Biosphere

SYMBIOSIS

• close interactions between two (populations) of organisms

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

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

e) resource partitioning: using specific parts of the same resource (i.e. trees)

d) character displacement: divergence of characteristics (i.e. beaks in finches)

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

• Mutualism: ( +/+) both benefit

EX. flowers/insect

• Commenalism: (+/0) one benefits and one neutral

EX. Birds / trees

MUTUALISM AND COMMENSALISM

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 2nd worksheet from Thursday.

Homework

• Read pp. 399-404

• Problem p 404 # 1-7