The relation between celestial colour gradients and the position of the sun, with regard to the sun compass
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Cited by (39)
A Snapshot-Based Mechanism for Celestial Orientation
2016, Current BiologyCitation Excerpt :The pattern of polarized light is characterized by E vectors that are arranged in concentric circles around the sun; thus, each celestial E vector vibrates perpendicular to the sun’s position (Figure 1A). Similarly, the celestial color gradient is characterized by a higher intensity of green light in the solar hemisphere and a relatively higher intensity of UV light in the anti-solar hemisphere [15] (Figure 1A). According to the “matched-filter” model, all celestial cues could be linked together at the neural level, allowing the animal to swap easily between cues while navigating [16].
Sun compass integration of skylight cues in migratory monarch butterflies
2011, NeuronCitation Excerpt :Flight simulator experiments have shown that the visibility of the outdoor sun, the most prominent light in the sky, is sufficient for proper orientation (Stalleicken et al., 2005). Moreover, other cues resulting from the scattering of sunlight, such as the pattern of polarized light and spectral gradients in the sky, also contain orientation information (Wehner, 2001; Coemans et al., 1994) (Figure 1A). As the electric field vectors of linearly polarized light (E-vectors) are arranged in concentric circles around the sun, they can indicate the sun's position, even when the sun itself is covered by clouds and only a small patch of blue sky is visible (Labhart, 1999).
Navigational mechanisms of migrating monarch butterflies
2010, Trends in NeurosciencesCitation Excerpt :The sun is the most prominent feature of the sky used for sun compass navigation. Scattered sunlight induces the polarization pattern and spectral gradient of skylight, and these can also be used as sources of directional information [21,22]. In migratory monarchs, flight simulator experiments have shown that seeing the sun is sufficient for proper flight orientation [16,17,23,24].
Light-dependent orientation responses in animals can be explained by a model of compass cue integration
2010, Journal of Theoretical Biology