Natural Selection Lab - DOC - DOC

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```					                                                 Predator Prey Laboratory

Problem:
•      To what extent does size and coloration affect survival rate in different types of “bean bugs?”
•      To what extent does beak type (spoon, fork, and tweezers) predict survival of “birds?”

Which bean bug and bird beak type do you believe will be most successful?
Hypothesis 1: coloration and size of bug:

Materials:
•       Beans (bugs)
•       Bird beaks (spoon, fork, and tweezers)
•       Cup (stomach)
•       Stopwatch
Procedure:

Step 1: Assume the role of a predator and attempt to capture as much prey as possible in order to prevent extinction of your
species! Follow the rules below or you will become extinct!

   You will be given 2 minutes to hunt as much prey as you can.
   In order to catch the prey you must pick it up using only your “beak” (Birds do NOT have hands or fingers!), stand up
completely (knees not bent), and drop it into your stomach cup.
   After the 2 minutes is up you must migrate to a warmer climate and can not collect any more delicious “bean bugs”.
   Predators that push, shove or otherwise misbehave will become extinct!
Step 2: Record the number and type of bugs collected on the sheet provided.

Step 3: Repeat the “hunt” to see how natural selection will influence future generations.

Step 4: Complete the data chart provided. Calculate how many bean bugs were eaten and how many remained for each
category. Use the data you collected to test your hypotheses and answer the questions below.

Generation 1        Tweezer-bird        Spoon Billed Bird   Fork Billed   # Eaten (by   Total Bug Population -
Bird          Bug Type)     # Eaten = # Remaining
Bugs
Lima Bean Bug

Kidney Bean Bug

Navy Bean Bug

# Eaten (by Bird Beak
Type)

Generation 2        Tweezer-bird        Spoon Billed Bird   Fork Billed   # Eaten by    Total Bug Population -
Bird          Bug Type      # Eaten = # Remaining
Bugs
Lima Bean Bug
Kidney Bean Bug

Navy Bean Bug

# Eaten by Bird Beak
Type

Generation 3            Tweezer-bird       Spoon Billed Bird   Fork Billed   # Eaten by   Total Bug Population -
Bird          Bug Type     # Eaten = # Remaining
Bugs
Lima Bean Bug

Kidney Bean Bug

Navy Bean Bug

# Eaten by Bird Beak
Type

Which color prey seemed to be best adapted by means of camouflage to this environment? Which is the least adapted?
Explain.

Which predator seemed to be best adapted to successfully capture more prey? Explain.

What other factors besides color could have affected the bean survival?

What other factors besides mouthpart might have contributed to the predator's success?

Did any predator or prey become extinct? Why or why not? If the answer is no, which possibly faced extinction over the next
several generations?

Did the experimental results support or refute your hypotheses?

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