ecosystem disturbances and ecosystem services
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Ecosystem Disturbances and Ecosystem Services. Chapter 3. Ecosystem Disturbances. A large part of environmental science is studying what happens when natural or anthropogenic disturbances occur or predicting what will happen when they do. What is a WATERSHED?.

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Presentation Transcript
ecosystem disturbances
Ecosystem Disturbances
  • A large part of environmental science is studying what happens when natural or anthropogenic disturbances occur or predicting what will happen when they do
what is a watershed
What is a WATERSHED?

It is an area of LAND that water flows across or through downstream on its way to a stream, lake or ocean.

The watershed acts like a funnel collecting all the water within an area into a larger waterway.

It is also called a Drainage Basin

watershed study hubbard creek
Watershed Study- Hubbard Creek
  • Deforested watershed vs. forested watershed
  • Take aways:
    • 1) disturbances in ecosystems disrupt natural cycling and systems
    • 2) Forests/vegetation are important for accumulation and maintenance of soil nutrients
case study haiti1
Case Study- Haiti
  • Take aways-
    • 1) poorer nations often rely on cheaper fuels such as raw or less processed biomass like trees and charcoal
    • 2) positive feedback loop - - less trees = more erosion = less vegetation
    • 3) #2 has economic impacts - - less farming, greater impact from natural disasters, less jobs
    • 4) Finding innovative solutions to environmental issues must strike a balance and must acknowledge the connectivity between the environment, human health and well being, and the economy
    • -Related story: WangaariMaathaihttp://www.greenbeltmovement.org/wangari-maathai
resistance vs resilience
Resistance vs. Resilience
  • Resistance – how much a disturbance affects flows of energy and matter
    • -a disturbance that affects populations and communities but not the flow of energy and matter we say it has high resistance
    • More biodiversity = greater resistance
resistance vs resilience1
Resistance vs. Resilience
  • Resiliance – how quickly an ecosystem can recover and return to its original state
    • - more biodiversity = greater resilience
  • Intermediate Disturbance Hypothesis
    • Take away – the more diverse an ecosystem is the better off it is!
  • Restoration Ecology – studies how to reverse effects and restore original ecosystem services
    • EX: wetland remediation
ecosystem services
Ecosystem Services
  • Ecosystems provide all of our essential needs: clean water, shelter, clean air, etc.
  • Instrumental value – value based on if the entity can be useful, act as a tool, or provide a service.
    • Can often associate a monetary value with it
    • EX: Water purification
    • Provisions
    • Regulating services
    • Support services
    • Resilience
    • Cultural Services
  • Intrinsic value – moral value or benefit
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