New cue-conflict experiments suggest a leading role of visual cues in the migratory orientation of Pied Flycatchers Ficedula hypoleuca

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• 作者：Dimitri Giunchi ; Lorenzo Vanni ; N. Emilio Baldaccini…
• 关键词：Cue ; conflict experiments ; Light polarization ; Migratory orientation ; Orientation cage ; Magnetic compass
• 刊名：Journal of Ornithology
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：156
• 期：1
• 页码：113-121
• 全文大小：569 KB
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• 作者单位：Dimitri Giunchi (1)
  Lorenzo Vanni (1)
  N. Emilio Baldaccini (1)
  Fernando Spina (2)
  Francesca Biondi (1)
  
  1. Department of Biology, Ethology Unit, Pisa University, Via Volta 6, 56126, Pisa, Italy
  2. Istituto Superiore per la Protezione e la Ricerca Ambientale (ISPRA), Sede Amministrativa ex-INFS, Via Ca-Fornacetta 9, 40064, Ozzano Emilia, Bologna, Italy
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Zoology
  Animal Ecology
  Evolutionary Biology
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：2193-7206

文摘

Migratory birds use both geomagnetic and celestial cues to select and maintain their seasonally appropriate migratory direction. The integration of the different compass cues is still poorly understood. Previous cue-conflict experiments suggested that Pied Flycatchers Ficedula hypoleuca did not recalibrate their magnetic compass against the polarization pattern at twilight, but the available evidence is problematic given the high variability of birds-directional preferences. We performed a new set of cue-conflict experiments where (1) we modified the protocol in order to try to reduce scatter of data and (2) we integrated the results of two experimental approaches, i.e. orientation cages and releases of radio-tagged birds. Pied Flycatchers were tested in Emlen funnels without access to celestial cues before and after being exposed to conflicting visual and geomagnetic information. After the second test, birds were equipped with radio-transmitters and followed until the vanishing of the radio signal. Contrary to previous experiments, our data showed a general dominance of celestial cues: polarized light sun-related pattern in captive birds tested without access to stars and stellar dominance in free-flying birds released under a starry sky at night-time. These results underline the importance of experimental protocols when testing ways in which birds integrate their compass systems.