In this lecture, we continue to discuss navigation in the context of homing and migration and then move on to discuss dispersal movement. We use examples from a few key model organisms (such as Cataglyphis ants, homing pigeons, wolf spiders, and monarch butterflies) to highlight different ways that odometry can be used to update idiothetic information used in navigation as well as different external cues that can serve as allothetic information for navigation. We transition from a detailed discussion of homing to an overview of key topics in migration (and navigational tools used there). We then close with a discussion of the function and mechanisms of dispersal.
Topic highlights:
- navigational tools involved in homing and migration
- a few key model organisms for studying navigation (e.g., Cataglyphis ants, homing pigeons, wolf spiders, monarch butterflies)
- idiothetic information and odometry (step counting, optical flow)
- allothetic information (landmarks, snapshots, magnetic maps/compass, celestial cues)
- cognitive maps
- migration versus homing
- dispersal
- functions of dispersal in terms of benefits and costs to the individual/genes (competition, outbreeding), not the species
- mechanisms of dispersal (who disperses and who stays behind)
Important terms: navigation, homing, Cataglyphis ants, homing pigeons, path integration, home vector, idiothetic information, odometer (and odometry), step counting, visual odometry (optical flow), allothetic information, landmarks, displacement experiments, snapshot orientation, magnetic maps, magnetic compass, celestial cues (and the sun compass), cognitive map, migration, stopover, dispersal
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