Illuminating the circadian clock in monarch butterfly migration |
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| Authors: | Froy Oren Gotter Anthony L Casselman Amy L Reppert Steven M |
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| Institution: | Department of Neurobiology, University of Massachusetts Medical School, LRB-728, 364 Plantation Street, Worcester, MA 01605, USA. |
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| Abstract: | Migratory monarch butterflies use a time-compensated Sun compass to navigate to their overwintering grounds in Mexico. Here, we report that constant light, which disrupts circadian clock function at both the behavioral and molecular levels in monarchs, also disrupts the time-compensated component of flight navigation. We further show that ultraviolet light is important for flight navigation but is not required for photic entrainment of circadian rhythms. Tracing these distinct light-input pathways into the brain should aid our understanding of the clock-compass mechanisms necessary for successful migration. |
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