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Difference in skylight intensity is a new celestial cue for sandhopper orientation (Amphipoda, Talitridae)

  Articoli su Riviste JCR/ISI  (anno 2009)

Autori:  Ugolini A., Galanti G., Mercatelli L

Affiliazione Autori:  Dipartimento di Biologia Evoluzionistica, Università di Firenze, Italy; Istituto Nazionale di Ottica Applicata, Firenze, Italy

Riassunto:  We investigated the use of the skylight intensity gradient as a new celestial compass cue in sandhoppers ( Talitrus saltator). Experiments were conducted at different latitudes ( temperate and equatorial) with different zenithal distances of the sun under a translucent ( opaline) Plexiglas dome. We also used a blue filter placed on the translucent dome to remove the spectral sky gradient, and a screen for the sun to remove the skylight intensity gradient. Therefore, in our experimental conditions, the spectral gradient and skylight polarization were impossible to use as directional information. Sandhoppers used the difference in skylight intensity in their directional choice when zenithal distance was greater than 10 degrees. Therefore, the anisotropic radiance distribution ( i.e. the difference in skylight intensity between the hemidome containing the sun and the opposite one) is a real celestial factor in animal spatial orientation. However, it is probably more imprecise than the solar orientation and could not be used by all animals. (C) 2008 The Association for the Study of Animal Behaviour. Published by Elsevier Ltd. All rights reserved.

Rivista/Giornale:  ANIMAL BEHAVIOUR
Volume n.:  77 (1)      Pagine da: 171  a: 175
Ulteriori informazioni:  We thank Dr Jochen Zeil (The Australian National University, Canberra, Australia) for his critical reading of the manuscript. The research was funded by the Università di Firenze (local funds ex-60%) assigned to A.U.
DOI: 10.1016/j.anbehav.2008.09.035

*Impact Factor della Rivista: (2009) 2.890   *Citazioni: 13
data tratti da "WEB OF SCIENCE" (marchio registrato di Thomson Reuters) ed aggiornati a:  19/05/2019

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