Biology 251: Lecture 12Fall 1996

Dispersal and Migration

  1. Introduction
    1. Aerial plankton
    2. Adaptive or accidental?
      1. Purpose
      2. Dispersal
      3. Migration
    3. Stay or go?

  2. Dispersal to new habitats
    1. Dispersal to unocupied habitats
    2. Seasonal dispersal
    3. Dispersal to alternate host plants

  3. Emigration results from population stress
    1. Crowding
    2. Reduction in food availability

  4. Long-distance, directional migration
    1. Cues
    2. Examples
      1. Monarch butterfly
      2. Locust
        1. Solitary phase
        2. Gregarious phase

  5. Humans as a factor in insect dispersal


"If we pause to think, we will have cause to thank." Apples of Gold