under the sea

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Olivia Cornteo (Author)

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Click to Run Model

globals [seaweed]
breed [sharks shark]
breed [seals seal]
breed [fishes fish]
patches-own [countdown]

to setup
  clear-all
  ask patches [ set pcolor blue ]
  if seaweed? [
    ask patches [
      set pcolor one-of [green blue]
      if-else pcolor = green
      [ set countdown seaweed-regrowth-time ]
      [set countdown random seaweed-regrowth-time]
    ]
  ]
  set-default-shape sharks "shark"
  create-sharks initial-number-sharks [
    set color gray
    set size 5.5
    set label-color white - 2
    setxy random-xcor random-ycor
  ]

  set-default-shape seals "seal"
  create-seals initial-number-seals [
    set color black
    set size 3.5
    setxy random-xcor random-ycor
  ]

  set-default-shape fishes "fish"
  create-fishes initial-number-fishes [
    set color orange
    set size 2
    setxy random-xcor random-ycor
  ]


  set seaweed count patches with [pcolor = blue]
  reset-ticks
end 

to go
  if not any? turtles [
    stop
  ]

  ask fishes [
    move
    if seaweed? [
      eat-seaweed
    ]
    reproduce-fishes
    lifespan
  ]

  ask seals [
    move
    catch-fish
    reproduce-seals
    lifespan
  ]

  ask sharks [
    move
    catch-seals
    reproduce-sharks
    lifespan
  ]

  if seaweed? [
    ask patches [
      grow-seaweed
    ]
  ]

  set seaweed count patches with [
    pcolor = blue
  ]
  tick
end 

to move
  rt random 50
  lt random 50
  fd 1
end 

to eat-seaweed
  if pcolor = green [
    set pcolor blue
  ]
end 

to reproduce-fishes
  if random-float 100 < fishes-reproduce [
    hatch 1 [
      rt random-float 360 fd 1
    ]
  ]
end 

to reproduce-seals
  if random-float 100 < seals-reproduce [
    hatch 1 [
      rt random-float 360 fd 1
    ]
  ]
end 

to reproduce-sharks
  if random-float 100 < sharks-reproduce [
    hatch 1 [
      rt random-float 360 fd 1
    ]
  ]
end 

to catch-fish
  let prey one-of fishes-here
  if prey != nobody [
    ask prey [
      die
    ]
  ]
end 

to catch-seals
  let prey one-of seals-here
  if prey != nobody [
    ask prey [
      die
    ]
  ]
end 

to lifespan
  let fishpop fishes-here
  let sealpop seals-here
  let sharkpop sharks-here
  if ticks = 50 [
    ask fishpop [
      die
    ]
  ]
  if ticks = 60 [
    ask sealpop [
      die
    ]
  ]
  if ticks = 70 [
    ask sharkpop [
      die
    ]
  ]
end 

to grow-seaweed
  if pcolor = blue [
    ifelse countdown <= 0 [
      set pcolor green
      set countdown seaweed-regrowth-time
    ]
    [
      set countdown countdown - 1
    ]
  ]
end

There is only one version of this model, created over 8 years ago by Olivia Cornteo.

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