Title

Sun compass integration of skylight cues in migratory monarch butterflies

UMMS Affiliation

Department of Neurobiology

Date

1-26-2011

Document Type

Article

Medical Subject Headings

Action Potentials; Animal Migration; Animals; Butterflies; *Cues; Orientation; Photoreceptor Cells, Invertebrate; Solar System; *Sunlight

Disciplines

Neuroscience and Neurobiology

Abstract

Migrating monarch butterflies (Danaus plexippus) use a time-compensated sun compass to navigate from eastern North America to their overwintering grounds in central Mexico. Here we describe the neuronal layout of those aspects of the butterfly's central complex likely to establish part of the internal sun compass and find them highly homologous to those of the desert locust. Intracellular recordings from neurons in the monarch sun compass network reveal responses tuned to specific E-vector angles of polarized light, as well as azimuth-dependent responses to unpolarized light, independent of spectral composition. The neural responses to these two stimuli in individual neurons are mediated through different regions of the compound eye. Moreover, these dual responses are integrated to create a consistent representation of skylight cues in the sun compass throughout the day. The results advance our understanding of how ambiguous sensory signals are processed by the brain to elicit a robust behavioral response.

Rights and Permissions

Citation: Neuron. 2011 Jan 27;69(2):345-58. Link to article on publisher's site

Related Resources

Link to Article in PubMed