ecosystem values and disturbances. valuesresistance vs. resilience intermediate disturbance...
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Ecosystem Values and Disturbances
Values Resistance vs. Resilience
Intermediate Disturbance Hypothesis Succession (primary vs. secondary)
Value of an Ecosystem
Instrumental• Cultural services:
– The knowledge we gain
• Provisions– pharmaceuticals
• Regulating Services– Act as filters of Carbon
dioxide
• Support Systems– Pollination– Filter water
Intrinsic• Value independent of any
benefit to humans.
What do you think happened here?
List some things that could cause disturbances in an ecosystem.
• Hurricanes• Ice storms• Volcanoes• Forest fires• Agriculture• Deforestation• Air pollution• surface mining
Resistance vs. Resilience
Resistance• The measure of how much a
disturbance can affect the flows of matter and energy in an ecosystem
Resilience • An ecosystem’s ability to
return to its original state.
Are all disturbances bad?
The intermediate Disturbance Hypothesis
States ecosystems experiencing intermediate levels of disturbance are more diverse than those with high or low disturbance levels.
Primary Succession vs. Secondary succession
Now draw your own on the back of the paper…
• Include the labels– Primary succession or secondary succession– Pioneer species– Intermediate species– Climax community
4 stages