2018
DOI: 10.1002/ece3.4025
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Do the fluorescent red eyes of the marine fish Tripterygion delaisi stand out? In situ and in vivo measurements at two depths

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 co… Show more

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Cited by 4 publications
(8 citation statements)
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“…Details of Halopteris filicina data collection protocol can be found in Harant et al . 19 . In short, substrate data were collected while scuba diving at a shallow site (5 m) characterized by rocky slopes, steep walls and granite boulders.…”
Section: Methodsmentioning
confidence: 99%
See 1 more Smart Citation
“…Details of Halopteris filicina data collection protocol can be found in Harant et al . 19 . In short, substrate data were collected while scuba diving at a shallow site (5 m) characterized by rocky slopes, steep walls and granite boulders.…”
Section: Methodsmentioning
confidence: 99%
“…In this study, we use simple mathematical expressions and visual modelling to determine the conditions that would enable triplefins to benefit from blue ocular sparks for prey detection. In the field, we collected measurements of ambient light and characterised the reflective properties of a background in which gammarids (Crustacea: Amphipoda), important triplefin prey items 18,19 , are found. In the laboratory, we measured the ocular spark properties of T. delaisi and the optical properties of the eyes and bodies of gammarids.…”
Section: Introductionmentioning
confidence: 99%
“…A gammarid moving through the water column at short distances could obviously be detected through regular vision without any help from active photolocation. However, in the more usual situation where gammarids are well camouflaged because they are translucent and have reflective properties similar to brown algae (see Harant et al 19 for algae reflectance), active photolocation could help locate the eyes of previously undetected individuals. In addition, there are many objects on the substrate - as there are in water - that may look like food items, but are not.…”
Section: Discussionmentioning
confidence: 99%
“…We measured the reflective properties of Halopteris filicina , a common foraging substrate for T. delaisi , and the downwelling light, unshaded sidewelling light, and shaded sidewelling light of triplefin habitat at STARESO in June-July 2014 and 2017. Details of Halopteris filicina data collection protocol can be found in Harant et al 19 In short, substrate data were collected while scuba diving at a shallow site (5 m) characterized by rocky slopes, steep walls and granite boulders. Measurements were obtained at various locations in conjunction with a polytetrafluorethylen (PTFE) diffuse white standard (DWS; Berghof Fluoroplastic Technology GmbH, Eningen unter Achalm, Germany) tilted at 45° to the surface as a combined measure of downwelling and sidewelling light.…”
Section: Methodsmentioning
confidence: 99%
“…These values represent the smallest and largest contrasts the setup could generate. The total photon radiance (integrated from 380 to 780 nm) of a polytetrafluoroethylene (PTFE) white reflectance standard (Lake Photonics, Uhldingen-Mühlhofe, Germany) placed flat on the platform surrounded by uniform 50% gray screens was measured from above using a calibrated SpectraScan PR 670 spectroradiometer (Photo Research, Syracuse, NY) and was 1.13 3 10 17 photons s À1 sr À1 m À2 nm À1 , similar to the total radiance measured in a comparable way in the shade around 20 m depth in the field where this species occurs (Harant et al, 2018). The OptoDrum software (Striatech) allows the free adjustment of the perceived width (spatial frequency), contrast, rotation direction (left or right) and angular speed of the striped pattern.…”
Section: Optokinetic Virtual Arenamentioning
confidence: 93%