System Zoo Z409 Fishery dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
Fishing is a classic example for use of a renewable resource. Unless overfished, fish populations If is hardly by fishing, then the fish population will persist at a constant size corresponding to its specific ecological envi ronment If the stock is overfished, the juvenile generation becomes too small to fully replace the adult generation. If overfishing continues. the population cannot recover and will collapse in short time. Even if fish catch stops now/, it could take decades until the fish population recovers to its original size if it hasn't become extinct meanwhile. In many of the world overtlshing has led, and still leads, to the complete collapse of formerly huge tlsh populations: herring in the North Sea, codtlsh in the Northern Atlantic. tuna, whales to name only a few. With the collapse of fish stocks came the collapse of the t1shing industry in many regions. Employment and
incomes disappeared: whole regions (like Newfoundland) lost their economic base.
REM 221 - Z409 Fishery dynamics
Adapted from Hartmut Bossel's "System Zoo 3 Simulation Models, Economy, Society, Development."
Population model where the population is summarized in four age groups (children, parents, older people, old people). Used as a base population model for dealing with issues such as employment, care for the elderly, pensions dynamics, etc.
[WIP] Z602 Population with four age groups, Czech Republic
System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel
System Zoo Z109: Logistic growth with constant harvest
System Zoo Z106: Simple population dynamics from System Zoo 1 by Hartmut Bossel
System Zoo Z106: Simple population dynamics
System Zoo Z101: Single integration from System Zoo 1 by Hartmut Bossel
System Zoo Z101: Single integration
System Zoo Z105: Time-dependent growth from System Zoo 1 by Hartmut Bossel
System Zoo Z105: Time-dependent growth
System Zoo Z105: Time-dependent growth from System Zoo 1 by Hartmut Bossel
Clone of System Zoo Z105: Time-dependent growth
System Zoo Z111: Density-dependent growth (Michaelis-Menten) from System Zoo 1 by Hartmut Bossel
System Zoo Z111: Density-dependent growth (Michaelis-Menten)
System Zoo Z109: Logistic growth with constant harvest from System Zoo 1 by Hartmut Bossel
Exercise 6 simulates a whale poplutation with a minimum reproductive capacity
Clone of System Zoo Z109 ex 6: Whale population
System Zoo Z112: Double integration and exponential decay from System Zoo 1 by Hartmut Bossel
System Zoo Z112: Double integration and exponential decay
Z205 from System Zoo 1 p95-98
Bossel: Z205 Chaotic Bistable Oscillator
Z207 from Hartmut Bossel System Zoo 1 p103-107
After running the default settings Bossel describes A=0.2, B=0.2, Initial Values X=0 Y=2 and Z=0 and varying C=2,3,4,5 shows period doubling and transition to chaotic behavior
Rossler Chaotic Attractor
System Zoo Z102: System state and state change from System Zoo 1 by Hartmut Bossel
System Zoo Z102: System state and state change
REM 221 - Z301 Regional Water Balance
System Zoo Z412 Tourism Dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
REM 221 - Z412 Tourism Dynamics
System Zoo Z404 Prey and two Predator Populations from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
Often a single prey population is the source of food for several competing predators (e.g. mice as prey of foxes and birds of prey). Here again a reliable intuitive assessment of long-term development resulting from the particular system relationship is impossible. A simulation model can assist in recognizing development trends inherent in the system structure even if in reality a variety of other factors determine the development and may cause it to proceed on a somewhat different path.
REM 221 - Z404 Prey and two Predator Populations
Z209 from Hartmut Bossel's System Zoo 1 p112-118. Compare with PCT Example IM-9010
Balancing an Inverted Pendulum
Based on the Market and Price simulation model in System Zoo 3, Z504. I made some more intrusive changes that make the model more realistic, or more 'economic', in another version 'simplified and improved'.
Simplified Z504 Market and Price - System Zoo 3
Model Z605 Miniworld, from System Zoo 3 by Hartmut Bossel
Z605 Miniworld
Exploring the conditions of permanent coexistence, rather than gradual disappearance of disadvantaged competitors. Z506 p32-35 System Zoo 3 by Hartmut Bossel.
Competition for Resources
Attempting to outdo an opponent leads to escalation. A weaker response leads to De-escalation. A slightly more complex form of Insight 972. Z508 p36-38 System Zoo 3 by Hartmut Bossel.
Escalation
System Zoo Z418 - Sustainable Use of a renewable resource from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources
Clone of ENV221 - Z418 - Sustainable Use of a renewable resource
Systems Zoo model Z308 Forest Dynamics (Bossel, 2007)
Bossel: Z308 Forest dynamics
Model 409a from Bossel "System Zoo 2". I have added some stochasticity to to the population specific growth rate.
A Simple Fishery
