PSY397H1 Chapter : Reading O notes.docx
Document Summary
Reading o notes: navigational mechanisms of migrating monarch butterflies. Model for meolecular and neural basis of long distance migration. Time- compensated sun compass in brain"s central complex with molecular mechanism in antennae- magnetic compass w two chryptochromes with magnetoreception capability. Genetic model: simple nervous system yet complex behavior, predictable and repetitive annual migration pattern. Monarch migration is genetic -> those who migrate north are a different generation from those migrating south. Photoperiodism and accompanying factors (such as milkweed) trigger migratory signals. Navigation: from previous studies, no evidence that monarchs use map , or have a locational sense of where they are, but they do have the ability to orient south during the day. Sun compass: time compensated sun compass, adjusts itself over course of the day to compensate for the sun"s position, using a circadian clock. Studies using l:d shifted conditions outdoors, monitored flight trajectory in migrant butterflies.
