Introduction to Ecology – predation

Walkingstick predation

Simulation: Fossweb.com >>Populations and Ecosystems

Results of experiment

Level 1 – Eat insects

Observations:

  • The brown walkingsticks were the easiest to find
  • The green-brown walkingsticks were the hardest to find

When there was a time limit on feeding:

  • The brown walkingsticks survived worst
  • The green-brown walkingsticks survived best

Possible Reasons:

  • The green and green-brown walkingsticks were able to blend into the bush environment due to their similar body colouring.
  • The brown walkingsticks were least able to blend into the environment as they had contrasting body colouring.
  •  Due to time constraint, predators ate the walkingsticks that they could notice most easily, i.e. the brown walkingsticks

Level 2 – Eat insects in 3 different environments

30 seconds

Bush environment

 

Wood chips

Bamboo leaves

 

30 clicks

Bush environment

Wood chips

Bamboo leaves

Adaptations:

The walkingsticks with the colour traits that did not blend into the environment died out quickly, while the number of walkingsticks with colour traits that blended into the environment gradually increased. This shows that as time passed, the walkingsticks adapted their body colour to suit the environment they lived in.

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