NetLogo User Community Models
Population regulation via feedback
by Klahs, Phil and Karsai, Istvan (Submitted: 08/06/2014)
## WHAT IS IT?
Please cite as:
Klahs, P. and Karsai, I (2014): Population regulation via feedback. Netlogo v. 5.01 simulation. http://ccl.northwestern.edu/netlogo/models/community/Population regulation via feedback.nlogo
This is a simple model to demonstrate the effect of feedback on birth and death to population growth. I use this model to teach students on understanding the effect of feedback (positive and negative) on systems.
## HOW IT WORKS
The simulation works with 2 populations (red and black); they die and propagate according to the rules. The agents are not affecting each other directly.
## HOW TO USE IT
You set up the size of the arena and the type of feedback for birth and death. For example if both is set to neutral (=) then you will observe random walk of the population sizes. Positive death strategy tends to stabilize the populations and tends
## THINGS TO NOTICE
Experiment with different setups and follow the fate of the 2 populations. Understand the effect of negative and positive feedback on the populations.
## THINGS TO TRY
Try to run the simulation on different sizes of arena and study the effect of habitat size on stability of populations.
## EXTENDING THE MODEL
The model is deliberately oversimplified. The main goal of this model to teach the effect of feedback on a simple system. Our more complicated 2 populations model can be found here: http://ccl.northwestern.edu/netlogo/models/community/HabitatFragmentation
## NETLOGO FEATURES
See notes in the code for details
## RELATED MODELS
This model is inspired by the book of Eigen and Winkler: Das Spiel: Naturgesetze steuern den Zufall.
## CREDITS AND REFERENCES
This model was described and analysed in detailed in this book:
Eigen, M. and Winkler, R. (1975). Das Spiel: Naturgesetze steuern den Zufall, ISBN-13: 978-3492021517 Piper. pp. 403. (in German).
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