title: Fluorescence characterisation and visual ecology of pseudocheilinid wrasses.
abstract: BACKGROUND
  Wrasses represent the second largest family of marine fishes and display a high diversity of complex colours linked to ecological functions. Recently, red autofluorescent body colouration has been reported in some of these fishes. However, little is known about the distribution of such fluorescent body patterns in wrasses or the animals' ability to perceive such colours.
  
  
  RESULTS
  Against this background, we (1) investigated long-wavelength emission autofluorescence in thirteen species of pseudocheilinid wrasses and (2) characterised the spectral absorbance of visual pigments in one of the examined species, the fairy wrasse Cirrhilabrus solorensis. Spectrophotometric analysis revealed that fluorescent body colouration is widespread and diverse within this clade, with considerable variation in both fluorescent pattern and maximum emission wavelength between species. Characterisation of visual pigments in retinal photoreceptors showed a single class of rod and three spectrally distinct cone photoreceptors, suggesting possible trichromacy.
  
  
  CONCLUSIONS
  Combining the emission characteristics of fluorescence body colouration and the spectral sensitivity data of retinal cells suggests that the visual system of C. solorensis is sensitive to pseudocheilinid fluorescence.
authors.affiliation: Animal Evolutionary Ecology group, Faculty of Sciences, University of Tübingen, Tübingen, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Gerlach
authors.affiliation: Animal Evolutionary Ecology group, Faculty of Sciences, University of Tübingen, Tübingen, Germany.
authors.forename: Jennifer
authors.initials: J
authors.lastname: Theobald
authors.affiliation: School of Animal Biology and The Oceans Institute, The University of Western Australia, Perth, Australia.
authors.forename: Nathan S
authors.initials: NS
authors.lastname: Hart
authors.affiliation: School of Animal Biology and The Oceans Institute, The University of Western Australia, Perth, Australia.
authors.forename: Shaun P
authors.initials: SP
authors.lastname: Collin
authors.affiliation: Animal Evolutionary Ecology group, Faculty of Sciences, University of Tübingen, Tübingen, Germany.
authors.forename: Nico K
authors.initials: NK
authors.lastname: Michiels
keywords: Colour vision; Labridae; Microspectrophotometry; Photoluminescence; Red fluorescence