A magnetic compass aids monarch butterfly migration

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Convincing evidence that migrant monarch butterflies (Danaus plexippus) use a magnetic compass to aid their fall migration has been lacking from the spectacular navigational capabilities of this species. Here the authors use flight simulator studies to show that migrants indeed possess an inclination magnetic compass to help direct their flight equatorward in the fall. The use of this inclination compass is light-dependent utilizing ultraviolet-A/blue light between 380 and 420 nm. Notably, the significance of light <420 nm for inclination compass function was not considered in previous monarch studies. The antennae are important for the inclination compass because they appear to contain light-sensitive magnetosensors. For migratory monarchs, the inclination compass may serve as an important orientation mechanism when directional daylight cues are unavailable and may also augment time-compensated sun compass orientation for appropriate directionality throughout the migration.

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ELECTRONIC FILE - Zoology

CSE-style Citation: Guerra PA, Gegear RJ, Reppert SM. 2014 Jun 24. A magnetic compass aids monarch butterfly migration. Nature Communications. 5:4164.

[Note that the article number is 4164, but I've put it in the page number slot within Biblio as that is where CSE puts article number for online journals, which aren't paginated in relation to the other articles in a "volume."--pjp]