Chapter 11 Self-test questions

. Which of the following approaches has not aided the elucidation of migratory routes in animals?

Tagging.

Tracking radar.

Laboratory experiments.

Satellite-based radiotelemetry.

. All migratory birds use identical routes to travel to their wintering grounds and to return to their summer ranges.

True

False

. In some species of migratory animals, the annual migratory cycle is not completed by one individual but instead by several generations.

True

False

. Which of the following factors have been implicated in diurnal migratory birds to determine the migratory routes? Please select all that apply.

Genes.

Constellation of stars.

Position of the sun, in combination with biological clock information.

Earth's magnetic field.

. A migratory bird orients preferentially north during migratory restlessness. The biological clock of this bird is then shifted such that day begins and ends six hours later than the natural day. What will be the preferential direction of orientation immediately after this experimental manipulation when the bird is exposed to natural-day conditions?

North.

East.

South.

West.

. The following statements concern the relationship between magnetoreception and navigation in homing and migratory birds. Which are correct? Please select all that apply.

Migratory birds can extract from magnetic cues compass information.

Migratory birds can extract from magnetic cues map information.

The decision by migrating birds of whether to use magnetic information for navigation appears to depend on the availability of positional information about the sun.

Experimental evidence supports the hypothesis that different types of magnetic information are processed by a common sensory mechanism.

. Salmon use olfactory information for homing. Which of the following statements related to this phenomenon is correct?

Salmon become imprinted on olfactory waypoints during the smoltification stage when they migrate from their natal places downstream towards the sea.

Olfactory information used for homing is inherited.

Salmon exhibit during homing an intrinsic preference for olfactory cues associated with breeding sites. This mechanism guides them to their natal places.

After returning from the sea to freshwater streams, salmon learn to use olfactory waypoint information to return to their natal sites.

. During the upstream migration stage, virtually all salmon successfully return to their natal site.

True

False

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