The Wolves and Moose on Isle Royal. Isle Royale images from: .
Transcript of The Wolves and Moose on Isle Royal. Isle Royale images from: .
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The Wolves and Moose on Isle Royal
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Isle Royale images from: http://www.kgcphoto.com/isle_royale_national_park.htm
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Wolf and moose images from http://blog.kingsoutdoorworld.com/2007/02/
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alright – back to work…
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• Largest island in lake Superior• Isolated from mainland most of the time• Home to moose and wolves
For now: • concentrate on actions between wolves and
moose herd• ignore other influences on moose population
(such as ?)• rather limited “systems” approach
(see additional reading on web page)
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How to describe feedback:
size of moose herd size of wolf pack
size of wolf pack size of moose herd
positive feedback
negative feedback
more food on four legs
more hungry mouths to feed
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Example of a Feedback Loop
Size of moose herdMore food for wolves
Appetite for moose Size of wolf pack
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Note:
A feedback loop needs to be closed !
Therefore it needs at least
• two components
• two connections between these components
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Or Somewhat Simplified:
size of moose herd size of wolf pack
positive
negative
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How to analyze a feedback loop:
• Need to disturb the system• Doesn’t matter where you start• Analyze how disturbance moves through
the system
• How does wolf – moose system behave ?
size of moose herd size of wolf pack
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Sign of Feedback Loop
• number of negative couplings determines sign of feedback loop
• even number of negative couplings: positive feedback loop
• odd number of negative couplings: negative feedback loop
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Effects of Negative of Positive Feedbacks
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Effects of Negative of Positive Feedbacks• positive feedback: input signal will be
amplified
• negative feedback: input signal will be damped
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Size of wolf and deer herds
From Science Times (3/19/1996) (http://www.admin.mtu.edu/urel/PressReleases/feature/wolves/wolf.html)