Formal method for objective assessment of primate color

Gerald, Melissa S.; Bernstein, John P K; Hinkson, Roystone; Fosbury, R. A. E.

doi:10.1002/1098-2345(200102)53:2<79::aid-ajp3>3.0.co;2-n

Cited by 58 publications

(47 citation statements)

References 14 publications

(15 reference statements)

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“…This works well for categories (e.g., dark vs. pale) and for species with large individual differences in colour. However, digital imagery provides better quantitative data, when corrected for ambient lighting (M S Gerald, Bernstein, Hinkson, & Fosbury, 2001;Martin Stevens, Parraga, Cuthill, Partridge, & S.Troscianko, 2007). More sophisticated methods include spectrometry (Renoult et al, 2011;Sumner & Mollon, 2003).…”

Section: Discussionmentioning

confidence: 99%

Color in competition contexts in non-human animals

Setchell¹

2015

Handbook of Color Psychology

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Section: Discussionmentioning

confidence: 99%

Color in competition contexts in non-human animals

Setchell¹

2015

Handbook of Color Psychology

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“…2 E and F. many studies used spectrometry to acquire chromatic information of the signals, i.e., the reflectance spectra of the color patches on the animal or the plant (5,8,37,38). By mapping the spectral data onto the color space of a studied animal species on the basis of the estimated photon catches for known photoreceptor types, insights can be gained about the strength of color signals from the viewpoint of the receiver (7, 9-11, 39, 40).…”

Section: Discussionmentioning

confidence: 99%

Hyperspectral imaging of cuttlefish camouflage indicates good color match in the eyes of fish predators

Chiao

Wickiser²,

Allen³

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

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Camouflage is a widespread phenomenon throughout nature and an important antipredator tactic in natural selection. Many visual predators have keen color perception, and thus camouflage patterns should provide some degree of color matching in addition to other visual factors such as pattern, contrast, and texture. Quantifying camouflage effectiveness in the eyes of the predator is a challenge from the perspectives of both biology and optical imaging technology. Here we take advantage of hyperspectral imaging (HSI), which records full-spectrum light data, to simultaneously visualize color match and pattern match in the spectral and the spatial domains, respectively. Cuttlefish can dynamically camouflage themselves on any natural substrate and, despite their colorblindness, produce body patterns that appear to have highfidelity color matches to the substrate when viewed directly by humans or with RGB images. Live camouflaged cuttlefish on natural backgrounds were imaged using HSI, and subsequent spectral analysis revealed that most reflectance spectra of individual cuttlefish and substrates were similar, rendering the color match possible. Modeling color vision of potential di-and trichromatic fish predators of cuttlefish corroborated the spectral match analysis and demonstrated that camouflaged cuttlefish show good color match as well as pattern match in the eyes of fish predators. These findings (i) indicate the strong potential of HSI technology to enhance studies of biological coloration and (ii) provide supporting evidence that cuttlefish can produce color-coordinated camouflage on natural substrates despite lacking color vision.Sepia officinalis | skin coloration | defense | predator-prey | visual perception

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“…A total of 1321 photographs were suitable for analysis. Images required calibration, to account for exposure and light drift (Gerald et al 2001). It was impossible either to get animals in the same frame as a photographic white and black standard, or to place a standard in the same position as the animal and capture a second image immediately following that of the subject.…”

Section: Methodsmentioning

confidence: 99%

Signal content of red facial coloration in female mandrills ( Mandrillus sphinx )

2006

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Studies of secondary sexual ornamentation and its maintenance by sexual selection tend to focus on males; however, females may also possess showy ornaments. For example, female mandrills possess facial coloration that ranges from black to bright pink. We used fortnightly photographs of 52 semi-free-ranging females aged above 3 years over 19 months to evaluate whether colour conveys information concerning female competitive ability, reproductive quality, age or reproductive status. Colour was not related to female rank or quality (body mass index, age at first birth or mean inter-birth interval); however, colour did increase significantly with age and primiparous females were darker than multiparous females. Colour may therefore signal reproductive quality, as younger females are less fertile and produce smaller offspring. Colour was brighter during the follicular phase than during the luteal phase, suggesting that it may signal fertility. Colour also varied across gestation and peaked at four and eight weeks post-parturition, suggesting that it may signal approaching parturition and lactation. Future studies should examine the relationship between colour and the menstrual cycle in more detail, the hormonal basis of female colour, and determine experimentally whether mandrills of both sexes attend to differences in colour between and within females.

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Formal method for objective assessment of primate color

Cited by 58 publications

References 14 publications

Color in competition contexts in non-human animals

Color in competition contexts in non-human animals

Hyperspectral imaging of cuttlefish camouflage indicates good color match in the eyes of fish predators

Signal content of red facial coloration in female mandrills ( Mandrillus sphinx )

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