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 almost 6 years ago

ecology 

Tagged by Viktor Vojtko almost 6 years ago

sociology 

Tagged by Viktor Vojtko almost 6 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 about 6 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 about 6 years ago by Viktor Vojtko.

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