Evolution and forest resource use

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Default-person Susan Hanisch (Author)

Tags

evolution 

Tagged by Susan Hanisch 5 months ago

sustainability 

Tagged by Susan Hanisch 5 months ago

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Model Information and Materials

Model Google Drive Link: https://drive.google.com/open?id=1S7Z_EGwPMY03kAzYcbs9VaaUjXA4Z34Z

Model GUI overview: https://drive.google.com/open?id=1itUv2XPcWANk7zGKwagNl8gtdmXR0m6v

Discussion guide and lesson plan: https://docs.google.com/document/d/1HXx9hVN55LUiHbBpFhVE--oqERHCfY_5rRgSeCEA-jg/edit?usp=sharing

References and Citation

For this model:

For the NetLogo-Software:

Licence

CC BY-NC-SA 3.0

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. http://creativecommons.org/licenses/by-nc-sa/4.0/

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Click to Run Model

breed [trees tree]
breed [farmers farmer]

farmers-own [
  harvest-type
  amount
  harvest
  wealth
]

trees-own [height]


;;;;;;;;;;;;;;;;;;;;;;
;;;Setup Procedures;;;
;;;;;;;;;;;;;;;;;;;;;;

to setup
  clear-all

  setup-pastures
  setup-trees
  setup-farmers

  reset-ticks
end 

to setup-pastures
  ask patches [set pcolor brown + 2]
end 

to setup-trees
  ask patches [
    sprout-trees 1 [
    set shape "tree"
    set color green - 2
    set height Max-Treeheight
    set size ( height / 100 )
  ]]
end 

to setup-farmers
  ask n-of Initial-Number-Agents patches
    [sprout-farmers  1 [
      set shape "person logger"

      set size 0.9 ] ]

  ask n-of Number-Modest farmers [ set harvest-type "sustainable"]

  update-color
end 


;;;;;;;;;;;;;;;;;;;;;;;;
;;;Runtime Procedures;;;
;;;;;;;;;;;;;;;;;;;;;;;;

to go

  ask farmers with [harvest-type = "sustainable"] [set amount Percent-cut-modest]
  ask farmers with [harvest-type = "greedy"] [set amount Percent-cut-greedy]

  cut-trees

  livingcosts

  if Reproduction?
  [reproduce]
  death

  ask trees [ regrow]

  tick
end 

to cut-trees

  harvest-commons

  ask farmers [set wealth wealth + harvest]
end 

to harvest-commons
  ask farmers [
     let harvest-tree max-one-of (trees in-radius 1) [height]
   ;; let neighborhood (patch-set neighbors with [not any? farmers-on self ])
  ;;  ifelse (any? neighborhood)
 ;;   [
     ;; let harvest-tree max-one-of (trees-on neighborhood) [height]
       move-to harvest-tree
        set harvest (  [height] of harvest-tree  * ( amount / 100))
        ask  harvest-tree [set height (height - (height * [amount ] of myself / 100))]
    ]
   ;; [set harvest 0]
  ;;]
end 

to livingcosts
  ask farmers [set wealth wealth - Living-costs]
end 

to reproduce

 ask farmers
  [ let neighborhood  (patch-set neighbors with [not any? farmers-on self ])
      if (any? neighborhood)  and random-float 1 < ( 0.0005 * wealth );;/ 100)
        [hatch 1 [
             mutate
         set wealth ([wealth] of myself / 2)
         move-to one-of neighborhood
          ]
        set wealth (wealth / 2)
        ]
     ]
end 

to mutate  ;; turtle procedure
    if random-float 100 < Mutation-rate
    [ifelse harvest-type = "sustainable"
      [set harvest-type "greedy"]
      [set harvest-type "sustainable"]
    ]
   update-color
end 

to death
  ask farmers
  [if wealth <= 0 [die]]
end 

to update-color
   ask farmers [
    ifelse harvest-type = "sustainable"
      [set color green ]
      [set harvest-type "greedy"
       set color red]
  ]
end 

to regrow ;; tree
  ifelse height > 0
   [ set height  (height + ((Growth-rate * height) * (1 - (height / ( Max-Treeheight)  ))))
   ]
   [set height 0.01]
  set size height / 100
end 

;;;;;;;;;;;;;;
;;;;;;;;;;;;;

;;; Farmers1 variables

to-report average-wealth-greedys
  report sum [wealth] of farmers with [harvest-type = "greedy"] / count farmers with [harvest-type = "greedy"]
end 

to-report average-wealth-sustainables
  report sum [wealth] of farmers with [harvest-type = "sustainable"] / count farmers with [harvest-type = "sustainable"]
end 

There are 2 versions of this model.

Uploaded by When Description Download
Susan Hanisch 5 months ago new Info added (link to lesson plan) Download this version
Susan Hanisch 5 months ago Initial upload Download this version

Attached files

File Type Description Last updated
Evolution and forest resource use.png preview Preview for 'Evolution and forest resource use' 5 months ago, by Susan Hanisch Download

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