MIHS-17 Period 3 Katie S, Derek W

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katie stoops (Author)

CHANGES:

Added a third creature to the Wolf-Sheep predation system that consumes secondary consumers and consumes flowers that spawn around the field

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breed [primaries primary]
breed [secondaries secondary]
breed [tertiaries tertiary]
breed [flowers flower]
turtles-own [energy]
patches-own [regrowthcounter]

to setup
  clear-all
  setup-turtles
  setup-patches
  reset-ticks
end 

to go
  generate-flowers
  ask primaries[
    move-turtles
    eat-grass
    reproduce-primary
    check-death
  ]
  ask secondaries[
    move-turtles
    eat-primaries
    reproduce-secondary
    check-death
  ]
  ask tertiaries[
    move-turtles
    eat-secondaries
    eat-flowers
    reproduce-tertiary
    check-death
  ]
  ask patches[
    grass-grow
  ]
  tick
end 

to move-turtles
 rt random 50
 lt random 50
 fd 0.5
 set energy energy - 0.1
end 

to eat-grass
   if pcolor = green[
   set pcolor brown
   set energy energy + energy-from-grass
   ifelse show-energy?
    [set label energy]
    [set label ""]
  ]
end 

to eat-primaries
  ifelse show-energy?
    [set label energy]
    [set label ""]
  let prey one-of primaries-here
  if prey != nobody[
    set energy [energy] of prey * (percent-taken / 100)
    ask prey[die]
  ]
end 

to eat-secondaries
  ifelse show-energy?
    [set label energy]
    [set label ""]
  let prey one-of secondaries-here
  if prey != nobody[
    set energy [energy] of prey * (percent-taken / 100)
    ask prey[die]
  ]
end 

to eat-flowers
  let prey one-of flowers-here
  if prey != nobody[
    set energy energy + 10
    ask prey[die]
  ]
end 

to reproduce-primary
  if random 100 < 4[
    if energy > 25[
      set energy energy - 10
      hatch 1[ set energy 25 ]
    ]
  ]
end 

to reproduce-secondary
  if random 100 < 4[
    if energy > 2[
      set energy energy - 4
      hatch 1[ set energy 5 ]
    ]
  ]
end 

to reproduce-tertiary
  if random 200 < 4[
    if(energy > 40)[
      set energy energy - 40
      hatch 1[set energy 40]
    ]
  ]
end 

to check-death
  if energy <= 0 [die]
end 

to generate-flowers
  create-flowers random 3[
   setxy random-xcor random-ycor
   set color pink
   set size 2
   set shape "plant"
  ]
end 

to grass-grow
  if pcolor = brown[
    ifelse regrowthcounter <= 0
      [set pcolor green
       set regrowthcounter random grass-regrowth-time]
      [set regrowthcounter regrowthcounter - 1]
  ]
end 

to setup-turtles
  if trophic-levels >= 1[
    create-primaries starting-turtles [
      setxy random-xcor random-ycor
      set color white
      set size 1
      set energy 30
    ]
  ]
  if trophic-levels >= 2[
    create-secondaries starting-turtles / 4[
      setxy random-xcor random-ycor
      set color red
      set size 1.1
      set energy 60
    ]
  ]
  if trophic-levels >= 3[
    create-tertiaries starting-turtles / 16[
      setxy random-xcor random-ycor
      set color blue
      set size 1.2
      set energy 60
    ]
  ]
end 

to setup-patches
  ask patches [
      set pcolor one-of [ green brown ]
      ifelse pcolor = green
        [ set regrowthcounter grass-regrowth-time ]
      [ set regrowthcounter random grass-regrowth-time ] ; initialize grass regrowth clocks randomly for brown patches
    ]
end

There is only one version of this model, created almost 8 years ago by katie stoops.

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