Stressors
description
Transcript of Stressors
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StressorsA brief introduction to a
revolutionary approach to impact management
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In the beginning…
…We spoke of threats. Common threats included:
• Loss of resource quantity• Loss of resource quality• Disruption of a process
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Loss of resource quantity:
• Habitat loss
• Reduced availability of a resource (i.e., resource depletion as opposed to removal)
• Barriers to movement/restricted access
Threats
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Loss of resource quality:
• Habitat degradation• Fragmentation
Threats
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Disruption of processes: Ecological: cyclical processes
disrupted (e.g., hydrologic cycles, fire regimes, natural succession)
Physiological: hibernation, estivation, metamorphosis processes disrupted
Biological: predation rates, competition rates
Threats
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Problem: One has to know the species to comprehend a threat• Fragmentation• Habitat degradation• Loss of breeding habitat
The Problem
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The Problem(s)
Population dynamics
Prey Base Dynamic
Inter-special Competition
Basic Habitat Need and Function
Predation Rates
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Then came stressors…
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Stressors
Increased predation rates
Or
Wildlife access to foodstuffs?
What would we tell a project proponent to avoid, minimize, and mitigate?
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A stressor is a clear descriptor that needs little to no interpretation
Sedimentation Soil compaction Vegetation removal Floating debris Chemical contamination
Stressors
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• Active agents– Vehicle strikes– Trampling– Ensnarement– Electrocution
• Physical agents– Chemical effluent– Sedimentation– Artificial light
Stressors
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• Breeding• Feeding• Sheltering
Conservation Needs
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Resource 1 R2 R3 R4
Stressor1 S2 S3 S4
Species
Need:Breeding
Species have three needs (i.e., breeding, feeding, sheltering).
A need has resources associated with it (e.g., Breeding need: forested wetlands to nest in, riparian areas to rear young in).
The resources have stressors impacting them.
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• Individual• Habitat• Circumstance
Resources
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Conservation Needs
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