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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
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