Download SPECIES INTERACTIONS

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
d) character displacement: divergence of
characteristics (i.e. beaks in finches)
e) resource partitioning:
using specific parts of
the same resource (i.e.
trees)
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 AND
COMMENSALISM
•
•
Mutualism: ( +/+) both benefit
EX. flowers/insect
Commenalism: (+/0) one benefits and one
neutral
EX. Birds / trees
Homework
• Read pp. 399-404
• Problem p 404 # 1-7
• Trifold Vocab: (Due Tuesday)
–Separate Sheet
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Interspecific Competition
Intraspecific Competition
Mutualism
Commensalism
Monday Will Collect:
• Notebooks
• Warm-ups
• Will Check 2nd worksheet
from Thursday.
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Symbiosis
Species Richness
Species Evenness
Primary Species
Pioneer Species
Homework
• Read pp. 399-404
• Problem p 404 # 1-7