Experimental Design and Variables

The video tutorial guides students through the Island Biogeography Lab, explaining the setup, execution, and analysis of experiments. It covers the selection of habitat types and taxa, running trials, and recording data. Students learn to manipulate variables like island size and distance from the mainland to observe biodiversity changes. The tutorial emphasizes consistency in choices and offers guidance on data interpretation.

What does a log scale on a graph indicate about the values represented?

• Each line represents a doubling of the previous value.

• Each line represents a halving of the previous value.

• Each line represents a tenfold increase from the previous value.

• Each line represents a constant increase of one unit.

In the first experimental design, what remains constant between the two islands?

• The size of the islands.

• The type of habitat.

• The distance from the mainland.

• The number of species.

When setting up the interactive lab, what must remain consistent throughout all experiments?

• The initial number of species.

• The choice of habitat and taxon.

• The speed of the simulation.

• The number of trials conducted.

What is the purpose of setting the simulation speed to maximum during the experiment?

• To reduce the waiting time for results.

• To increase the number of species observed.

• To ensure more accurate results.

• To observe the changes in real-time.

How many times should each trial be conducted in the first experiment?

• Once

• Three times

• Twice

• Four times

In the second experimental design, what is changed compared to the first design?

• The size of the islands.

• The habitat type.

• The distance from the mainland.

• The type of species observed.

What is the main variable altered in the third experimental design?

• The number of species.

• The size of the islands.

• The migration rate.

• The habitat type.

In the fourth experimental design, what changes are made to the islands?

• The type of species is changed.

• Only the distance from the mainland is changed.

• Only the size of the islands is changed.

• Both the size and distance from the mainland are altered.

Why is it important to maintain the same habitat and taxon choices throughout the experiments?

• To allow for more varied results.

• To reduce the complexity of the experiment.

• To increase the number of species observed.

• To ensure the results are comparable across different designs.

What should you do if you have questions during the experiment?

• Ask for help from the instructor.

• Restart the experiment.

• Consult the lab manual.

• Change the habitat type.