Do the fluorescent red eyes of the marine fish Tripterygion delaisi stand out? In situ and in vivo measurements at two depths

Ecology and Evolution
Ulrike Katharina HarantNico K Michiels

Abstract

Since the discovery of red fluorescence in fish, much effort has been invested to elucidate its potential functions, one of them being signaling. This implies that the combination of red fluorescence and reflection should generate a visible contrast against the background. Here, we present in vivo iris radiance measurements of Tripterygion delaisi under natural light conditions at 5 and 20 m depth. We also measured substrate radiance of shaded and exposed foraging sites at those depths. To assess the visual contrast of the red iris against these substrates, we used the receptor noise model for chromatic contrasts and Michelson contrast for achromatic calculations. At 20 m depth, T. delaisi iris radiance generated strong achromatic contrasts against substrate radiance, regardless of exposure, and despite substrate fluorescence. Given that downwelling light above 600 nm is negligible at this depth, we can attribute this effect to iris fluorescence. Contrasts were weaker in 5 m. Yet, the pooled radiance caused by red reflection and fluorescence still exceeded substrate radiance for all substrates under shaded conditions and all but Jania rubens and Padina pavonia under exposed conditions. Due to the negative effects of anesthesia ...Continue Reading

References

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Apr 22, 2017·BMC Ecology·Ulrike Katharina Harant, Nicolaas Karel Michiels
May 24, 2017·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Justin Marshall, Sonke Johnsen

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Citations

Feb 2, 2019·Journal of Vision·Matteo SantonNico K Michiels

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Software Mentioned

R package “ pavo

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