Predator - prey - people (in Czech)

Predator - prey - people (in Czech) preview image

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Vojtko2w Viktor Vojtko (Author)

Tags

biology 

Tagged by Viktor Vojtko over 11 years ago

ecology 

Tagged by Viktor Vojtko over 11 years ago

sociology 

Tagged by Viktor Vojtko over 11 years ago

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Model description in English

The model shows impact of people (hunters, gatherers/farmers) on a classical predator - prey ecosystem. It is possible to set protected land proportion.

Posted over 11 years ago

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breed [jeleni jelen]  
breed [vlci vlk]
breed [lide clovek]
turtles-own [energie]
lide-own [zemedelec zasoby]
patches-own [odpocet ochrana]

to setup
  clear-all
  ask patches [ set pcolor green ]
    ask patches [
      set odpocet random doba-rustu-rostlin 
      set pcolor one-of [66 37]
      set ochrana false  
    ]
  ask one-of patches [
    if chranene-uzemi > 0 [set ochrana true]
  ]
  repeat (chranene-uzemi / 100 * count patches - 1) [
    ask one-of patches with [ochrana] [
      if-else any? neighbors with [not ochrana] 
      [ask one-of neighbors with [not ochrana] [set ochrana true]]
      [ask one-of patches with [not ochrana] [set ochrana true]]
    ]
  ]
  ask patches with [ochrana] [set pcolor pcolor - 3]
  set-default-shape jeleni "jelen"
  create-jeleni poc-pocet-jelenu  
  [
    set color 32
    set size 2  
    set label-color blue - 2
    set energie random (2 * zisk-energie-z-rostliny)
    setxy random-xcor random-ycor
  ]
  set-default-shape vlci "vlk"
  create-vlci poc-pocet-vlku  
  [
    set color 4
    set size 2
    set energie random (2 * zisk-energie-z-jelena)
    setxy random-xcor random-ycor
  ]
  set-default-shape lide "person"
  create-lide poc-pocet-lidi
  [
    set color 14
    set size 2
    set energie random (2 * zisk-energie-z-jelena)
    setxy random-xcor random-ycor
    set zemedelec false
  ]
  ask n-of (podil-zemedelcu / 100 * count lide) lide [
    set zemedelec true
    set color 62
  ]
  reset-ticks
end 

to krokuj [kroky]
 repeat kroky [ go ]
end 

to go
  if not any? turtles [ stop ]
  ask lide with [zemedelec] [
    pohyb-lide-sklizen
    set energie energie - 1
    jist-rostliny-lide
    reprodukovat-lidi
    smrt-hladem
  ]
  ask lide with [not zemedelec] [
    pohyb-lide-lov
    set energie energie - 1
    chytat-korist
    reprodukovat-lidi
    smrt-hladem
  ]
  ask jeleni [
    pohyb
    set energie energie - 1  ; jeleni pohybem ztraceji energii
    jist-rostliny
    reprodukovat-jeleny
    smrt-hladem
  ]
  ask vlci [
    pohyb
    set energie energie - 1  ; vlci pohybem ztraceji energii
    chytat-jeleny
    reprodukovat-vlky
    smrt-hladem
  ]
  ask patches [ rust-rostlin ]
  tick
end 

to pohyb  
  rt random 50
  lt random 50
  fd 1
end 

to pohyb-lide-sklizen
  ifelse any? neighbors with [count lide-here = 0 and (pcolor = 66)] [
    face one-of neighbors with [count lide-here = 0 and (pcolor = 66)]
  ]
  [
    rt random 50
    lt random 50
  ]
  fd 1
end 

to pohyb-lide-lov  
  ifelse any? jeleni with [distance myself <= 1 and not [ochrana] of patch-here ] [
    face one-of jeleni with [distance myself <= 1 and not [ochrana] of patch-here ]  
  ]
  [
    ifelse any? vlci with [distance myself <= 1 and not [ochrana] of patch-here ] [
      face one-of vlci with [distance myself <= 1 and not [ochrana] of patch-here ]
    ]
    [
      rt random 50
      lt random 50
    ]
  ]
  fd 1
end 

to jist-rostliny  
  if (pcolor = 66 or pcolor = 63) [
    set pcolor ifelse-value ochrana [34] [37]
    set energie energie + zisk-energie-z-rostliny  
  ]
end 

to jist-rostliny-lide  
  if (pcolor = 66) [
    set pcolor 37
    set energie energie + zisk-energie-z-rostliny  
  ]
end 

to reprodukovat-jeleny
  if random-float 100 < jeleni-reprodukce [ 
    set energie (energie / 2)                
    hatch 1 [ rt random-float 360 fd 1 ]
  ]
end 

to reprodukovat-vlky  
  if random-float 100 < vlci-reprodukce [  
    set energie (energie / 2)              
    hatch 1 [ rt random-float 360 fd 1 ]  
  ]
end 

to reprodukovat-lidi
  if random-float 100 < lidska-reprodukce [  
    set energie (energie / 2)              
    hatch 1 [ 
      if-else random-float 100 <= podil-zemedelcu 
      [ set zemedelec true
        set color 62 ]
      [ set zemedelec false
        set color 14 ]
      rt random-float 360 
      fd 1 
    ]  
  ]
end 

to chytat-jeleny
  let korist one-of jeleni in-radius 0.5                   
  if korist != nobody                             
    [ ask korist [ die ]                          
      set energie energie + zisk-energie-z-jelena ]
end 

to chytat-korist
  let korist one-of (turtle-set jeleni vlci) with [distance myself <= 0.5 and [not ochrana] of patch-here]
  if korist != nobody                             
    [ let zisk-energie ifelse-value ([breed] of korist = "jelen") [zisk-energie-z-jelena] [zisk-energie-z-vlka]
      ask korist [ die ]                          
      set energie energie + zisk-energie ]
end 

to smrt-hladem
  if energie < 0 [ die ]
end 

to rust-rostlin  
  if (pcolor = 37 or pcolor = 34) [
    ifelse odpocet <= 0
      [ set pcolor ifelse-value ochrana [63] [66]
        set odpocet doba-rustu-rostlin ]
      [ set odpocet odpocet - 1 ]
  ]
end 

There is only one version of this model, created over 11 years ago by Viktor Vojtko.

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