Please read the board!
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Rubric and Lab sheet – important guides.
This Thursday tutorial – Lab “retake”
Wildfire
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The study of relationships between biotic and
abiotic factors.
Fire
Succession
Intermediate disturbance hypothesis
Niche
Habitat
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Primary Succession
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Secondary succession
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Fire wars 17-30
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Can fire ever be
beneficial?
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1944 – US Forest
Service
1988 – fires in
Yellowstone
shocked nation
1990 – fire policy
change
Fire wars 53-1:03
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Extinguish arson
Manage lightning strikes
Protect people
Prescribed burns used to reduce wildfire
intensity and to take advantage of fire’s
benefits to prairies/forests
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Fire wars 17-30
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Can fire ever be
beneficial?
Armand Bayou
prescribed burn
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Returns nutrients to
soil
Helps certain seeds
germinate
Forest – clears
underbrush /fuel
Prairie – kills trees
Light can reach soil
Help control
pathogens/insects
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Yarnell Hill fire AZ (19
hot shots killed;
lightning strike)
Yosemite National Park
(campfire)
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Perfect storm?
◦ Accumulated fuel
◦ More people living in
remote areas
◦ Climate change and
drought
◦ Crown fires are more
intense than ground fires
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Range of chemical
or physical
conditions that
must be
maintained for
populations of a
particular species
to stay alive and
grow, develop,
and function
normally.
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Primary Succession
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Secondary succession
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Range of
tolerance
Intermediate
disturbance
hypothesis
Succession
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All things are interconnected.
Everything goes somewhere.
There’s no such thing as a free lunch.
Nature always bats last.