BI 132 Lecture Notes - Lecture 7: Circadian Rhythm, Melatonin, Classical Conditioning

• School: University of Oregon
• Department: Biology
• Course: BI 132
• Professor: Debbie Schlenoff

Document Summary

Bi 132 lecture 7 migration and foraging. Rhythmic behavior: longer rhythms lunar, seasonal, annual clocks, example: important in breeding, hibernation, dispersal and migration. Migration: periodic passage of groups of animals from one region to another, usually for feeding or breeding, observed in many animals, insects monarchs, mammals whales, reptiles turtles, fish salmon, birds. Optimality = cost/benefit analysis: behaviors are compromises between costs and benefits, traits not perfect" but best they can be under particular circumstances (optimal, group discussion: generate a list of benefits and costs of migration. Why migrate: high cost of migration so, why do it, go south, avoid cold and other winter stresses, greater supply of food in winter, go north, reduced competition for food and territory, easier to find mates, reduced predation. How do monarchs know where to go during migration: recently, scientists have found a suite of genes that are activated when the insects migrate.