MALE THREE-SPINED STICKLEBACKS REFLECT IN ULTRAVIOLET LIGHT by INGOLF P. RICK 1) , RICARDA MODARRESSIE and THEO C.M. BAKKER 2) (Institut für Evolutionsbiologie und Ökologie, University of Bonn, An der Immenburg 1, D-53121 Bonn, Germany) Summary Recent studies evidenced that some fishes use ultraviolet light in social signalling. Using reflection spectrophotometry we showed that reproductively active male sticklebacks also reflect in the UV-light (300-400 nm). Several body regions showed a reflectance peak in the UV-waveband. Silvery appearing regions reflected stronger than red-coloured or darker ones. Males within one population varied in UV-reflection. The UV-contrast of one particular region was positively correlated with physical condition. Introduction It is often assumed that ultraviolet reflectance patterns play a role in intraspe- cific signalling especially in the context of sexual selection. Losey et al. (1999) divided UV-reflectance patterns into two functional groups. On the one hand they could enhance the attractiveness of a displaying male by en- hancing the contrast between visible and UV-reflectance components. On the other hand they could make a conspicuous colour spot more attractive (Losey et al. , 1999). Such UV-patterns are found in a wide variety of taxonomic groups including birds (Andersson & Amundsen, 1997), arthropods (Brun-
Behaviour – Brill
Published: Jan 1, 2004
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