Now you see me, now you don’t: iridescence increases the efficacy of lizard chromatic signals

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• 作者：Guillem Pérez i de Lanuza ; Enrique Font
• 关键词：Coloration ; Communication ; Lizard ; Signal efficacy ; Viewer geometry ; Visual modelling
• 刊名：Naturwissenschaften
• 出版年：2014
• 出版时间：October 2014
• 年：2014
• 卷：101
• 期：10
• 页码：831-837
• 全文大小：798 KB
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• 作者单位：Guillem Pérez i de Lanuza (1) (2)
  Enrique Font (2)
  
  1. CIBIO Research Centre in Biodiversity and Genetic Resources, InBIO, Universidade do Porto, Rua Padre Armando Quintas 7, 4485-661, Vair?o, Vila do Conde, Portugal
  2. Ethology Laboratory Institut Cavanilles de Biodiversitat i Biologia Evolutiva, Universitat de València, Valencia, Spain
  
• ISSN：1432-1904

文摘

The selective forces imposed by primary receivers and unintended eavesdroppers of animal signals often act in opposite directions, constraining the development of conspicuous coloration. Because iridescent colours change their chromatic properties with viewer angle, iridescence offers a potential mechanism to relax this trade-off when the relevant observers involved in the evolution of signal design adopt different viewer geometries. We used reflectance spectrophotometry and visual modelling to test if the striking blue head coloration of males of the lizard Lacerta schreibeiri (1) is iridescent and (2) is more conspicuous when viewed from the perspective of conspecifics than from that of the main predators of adult L. schreibeiri (raptors). We demonstrate that the blue heads of L. schreiberi show angle-dependent changes in their chromatic properties. This variation allows the blue heads to be relatively conspicuous to conspecific viewers located in the same horizontal plane as the sender, while simultaneously being relatively cryptic to birds that see it from above. This study is the first to suggest the use of angle-dependent chromatic signals in lizards, and provides the first evidence of the adaptive function of iridescent coloration based on its detectability to different observers.