Study Questions for Dispersal and Migration


1. Make a distinction between orientation and navigation (see Alcock)


2. Outline the experiments that show bees navigate by using polarized light. How do we know that they communicate (also, see Alcock)?


3. What is the zugenruhe as measured in the "Emlen funnel"? What kinds of experiments prove that birds use the sun or stars for navigation. Describe the hypotheses and predictions for each experiment. Outline the controls, manipulations, for each experiment.


4. Compare and contrast the microevolutionary and macroevolutionary hypotheses describing the maintenance of dispersal tendencies in a population.


5. Can the macroevolutionary hypothesis of extinction and colonization include a component involving group selection or perhaps demic or species selection?


6. Apply the principlesof species recognition (e.g., fitness and natural selection, isolating mechanisms) to the problem of deme recognition in bird song and song learning.