Color and color adaptation of the European tree frog, <i>Hyla arborea</i>

Nielsen, Hans Ingolf

doi:10.1002/jez.1402110204

Cited by 17 publications

(24 citation statements)

References 19 publications

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“…In various morphs of Anolis conspersus , chroma and brightness are important in regulating conspicuousness, especially in an environment where ambient light conditions change (Macedonia, ). A similar result has also been found in many earlier studies of color change in Hyla species (Nielsen and Dyck, ; Nielsen, ; Kats and Dragt, ; King et al, ), though not all (Wente and Phillips, ). The frogs' body reflectance on different background colors had similar peak wavelengths of about 550 nm across different studies, whereas brightness and chroma differed.…”

Section: Discussionsupporting

confidence: 88%

“…Despite the predictions of this model, there is no consensus across treefrog studies as to which color component is responsible for dorsal color change. According to various authors, dorsal color change may occur by changes in brightness (Nielsen and Dyck, ; Nielsen, ; Kats and Dragt, ; Stegen et al, ), hue (Wente and Phillips, ; Stegen et al, ), or chroma (Nielsen, ). This incongruity may arise from the differences among treefrog species in the capacity to change dorsal color, and degrees of background matching evidently vary widely among species (Nielsen and Dyck, ; Kats and Dragt, ; King et al, ).…”

mentioning

confidence: 99%

“…However, because color change experiments with treefrogs have been conducted with no standard experimental protocol, comparison across species is difficult. For example, test duration of previous studies has varied from a few hours (Nielsen, ; Nielsen and Dyck, ; Kats and Dragt, ; King et al, ) to 3 weeks (Wente and Phillips, ). In addition, potential problems may arise in matters of small sample sizes, limited numbers of background colors tested, and different analytic methods.…”

mentioning

confidence: 99%

“…When the xanthophore disperses and the melanophore aggregates, the brightness of the reflected lights increases. However, this rearrangement of the chromatophore exposes the iridophore, resulting in increase of the chroma (Nielsen, ; Nielsen and Dyck, ; King et al, ). This physiological constraint under the white background leaves two possibilities for background matching.…”

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confidence: 99%

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Background matching by means of dorsal color change in treefrog populations (Hyla japonica)

Choi

Jang

2013

J. Exp. Zool.

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Treefrogs change dorsal coloration to match background colors, presumably for predator avoidance. Dorsal coloration in treefrogs results from rearrangement of pigment granules in dermal chromatophores. This physiological basis for color change suggests that brightness and chroma are the color components that may change in response to background color. However, results of experiments are conflicting in that there is no consensus as to which color component is critical for color change in treefrogs. We tested predictions of the physiological model for color change in treefrogs by investigating dorsal color change under five background colors in three different populations of the treefrog Hyla japonica. Differences in color components between background colors and frogs were used as a measure of background matching. Throughout a 1-week experimental period, brightness and chroma differences decreased monotonically, while hue difference remained constant for all background colors. Chroma differences were smaller with the natural colors such as green and brown than with achromatic colors. Moreover, variation in color change among frogs from three localities that differed in land cover suggested that chroma change capacity may be sensitive to environmental conditions. Under the white background color, however, decreasing brightness difference seemed to be crucial to background matching. Furthermore, chroma difference and brightness difference did not decrease indefinitely, suggesting a trade-off between chroma difference and brightness difference under the white background. Thus, background matching may generally occur by decreasing chroma difference under most background colors in H. japonica, but brightness matching may be important under the white color.

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Section: Discussionsupporting

confidence: 88%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Background matching by means of dorsal color change in treefrog populations (Hyla japonica)

Choi

Jang

2013

J. Exp. Zool.

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“…In particular, HSI has the potential to be used in studies investigating dynamic changes in spectral skin properties with respect to short-term color changes shown by many anurans [1]–[3], [56], [57], [73]–[75] and long-term changes induced among others by environmental cues [4], [28].…”

Section: Discussionmentioning

confidence: 99%

Non-Invasive Measurement of Frog Skin Reflectivity in High Spatial Resolution Using a Dual Hyperspectral Approach

et al. 2013

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BackgroundMost spectral data for the amphibian integument are limited to the visible spectrum of light and have been collected using point measurements with low spatial resolution. In the present study a dual camera setup consisting of two push broom hyperspectral imaging systems was employed, which produces reflectance images between 400 and 2500 nm with high spectral and spatial resolution and a high dynamic range.Methodology/Principal FindingsWe briefly introduce the system and document the high efficiency of this technique analyzing exemplarily the spectral reflectivity of the integument of three arboreal anuran species (Litoria caerulea, Agalychnis callidryas and Hyla arborea), all of which appear green to the human eye. The imaging setup generates a high number of spectral bands within seconds and allows non-invasive characterization of spectral characteristics with relatively high working distance. Despite the comparatively uniform coloration, spectral reflectivity between 700 and 1100 nm differed markedly among the species. In contrast to H. arborea, L. caerulea and A. callidryas showed reflection in this range. For all three species, reflectivity above 1100 nm is primarily defined by water absorption. Furthermore, the high resolution allowed examining even small structures such as fingers and toes, which in A. callidryas showed an increased reflectivity in the near infrared part of the spectrum.Conclusion/SignificanceHyperspectral imaging was found to be a very useful alternative technique combining the spectral resolution of spectrometric measurements with a higher spatial resolution. In addition, we used Digital Infrared/Red-Edge Photography as new simple method to roughly determine the near infrared reflectivity of frog specimens in field, where hyperspectral imaging is typically difficult.

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Microhabitat selection by the Pacific treefrog, Hyla regilla

Wente

Phillips

2005

Animal Behaviour

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Color and color adaptation of the European tree frog, Hyla arborea

Cited by 17 publications

References 19 publications

Background matching by means of dorsal color change in treefrog populations (Hyla japonica)

Background matching by means of dorsal color change in treefrog populations (Hyla japonica)

Non-Invasive Measurement of Frog Skin Reflectivity in High Spatial Resolution Using a Dual Hyperspectral Approach

Microhabitat selection by the Pacific treefrog, Hyla regilla

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