today: reminders on the take-home final intro to ecological principles thinking about wolves…,...
TRANSCRIPT
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Today:
•Reminders on the Take-home Final
•Intro to Ecological Principles
•Thinking About Wolves…, Group Quiz 6If you finish early, work with me or your colleagues on your final draft.
Due Thursday!
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Next: Thinking About Next: Thinking About EcologyEcology
What is “ecology”?What sorts of
questions does ecology seek to
answer?
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Thinking About EcologyThinking About Ecology
Ecology encompasses a wide-range of inquiries, including:
Organismal Ecology
Population Ecology
Community Ecology
Ecosystem Ecology
Landscape Ecology
The Biosphere!
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Thinking About EcologyThinking About Ecology
Ecology is not Environmental Science! (Although Environmental Science pulls
heavily from Ecology!)
“To keep every cog and wheel is the first precaution to intelligent tinkering.”
- Aldo Leopold
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
Competing Principles in Community Ecology:
The Rivet Modelvs
The Redundancy Model
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
How do we know?
We need to understand a
species’ ecological niche: the total use of biotic and
abiotic resources in its environment.
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
A species’ ecological niche is often heavily influenced by competition (the competitive
exclusion principle)
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Thinking About Thinking About Ecology: Ecology:
Community Community EcologyEcology
An organism’s role in a community
can also be described by its trophic level.
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Thinking About Thinking About Ecology: Ecology:
Community Community EcologyEcology
The trophic relationships in a
community can be visualized in a food
web
Are there any limits the length of a food
web? If so, why??
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A Typical Biomass Pyramid:A Typical Biomass Pyramid:
Thinking About Ecology: Community Ecology
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Energy Transfer in an Ecosystem:Energy Transfer in an Ecosystem:
Thinking About Ecology: Community Ecology
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
Possible Limitations:
1. The Energetic Hypothesis
2. The Dynamic Stability
Hypothesis
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
Key Players in Community Dynamics:
1. Dominant species (high abundance or biomass)
2. Keystone species (pivotal role in community)
3. Foundation species (alter the structure or dynamics of their environment; facilitators)
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
Other Useful Ideas:
Biotic Potential
and
Environmental Resistance
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
Keystone species exert influence on a
community’s structure by virtue of their ecological niches.
How do we figure out who the keystone
species are??
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Analyzing the Analyzing the Impact of Impact of
Keystone SpecieKeystone Speciess
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Thinking About Ecology: Thinking About Ecology: Community EcologyCommunity Ecology
Thinking About the Gray Wolf
Reintroduction in Yellowstone