ecosystem values and disturbances
DESCRIPTION
Ecosystem Values and Disturbances. Value of an Ecosystem. Instrumental. Intrinsic. Value independent of any benefit to humans. Cultural services: The knowledge we gain Provisions pharmaceuticals Regulating Services Act as filters of Carbon dioxide Support Systems Pollination - PowerPoint PPT PresentationTRANSCRIPT
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Ecosystem Values and Disturbances
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Values Resistance vs. Resilience
Intermediate Disturbance Hypothesis Succession (primary vs. secondary)
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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.
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What do you think happened here?
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List some things that could cause disturbances in an ecosystem.
• Hurricanes• Ice storms• Volcanoes• Forest fires• Agriculture• Deforestation• Air pollution• surface mining
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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.
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Are all disturbances bad?
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The intermediate Disturbance Hypothesis
States ecosystems experiencing intermediate levels of disturbance are more diverse than those with high or low disturbance levels.
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Primary Succession vs. Secondary succession
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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