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  • The effect of stress and stress hormones on dynamic colour-change in a sexually dichromatic Australian frog

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    Author(s)
    Kindermann, Christina
    Narayan, Edward
    Wild, Francis
    Wild, Clyde
    Hero, Jean-Marc
    Griffith University Author(s)
    Hero, Jean-Marc
    Wild, Clyde H.
    Wild, Francis J.
    Kindermann, Christina
    Narayan, Edward J.
    Year published
    2013
    Metadata
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    Abstract
    Rapid colour changes in vertebrates have fascinated biologists for centuries, herein we demonstrate dynamic colour change in an anuran amphibian, the stony creek frog (Litoria wilcoxii), which turns from brown to bright (lemon) yellow during amplexus. We show this by comparing the colour of baseline (unpaired males) and amplecting (paired) males. We also investigate the possible role of stress and stress hormones on this colour change. Frogs were subjected to four different levels of stressors (handling, toe-clipping, saline injection and adrenocorticotropic hormone [ACTH] injection) and the colour change wasmeasured using ...
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    Rapid colour changes in vertebrates have fascinated biologists for centuries, herein we demonstrate dynamic colour change in an anuran amphibian, the stony creek frog (Litoria wilcoxii), which turns from brown to bright (lemon) yellow during amplexus. We show this by comparing the colour of baseline (unpaired males) and amplecting (paired) males. We also investigate the possible role of stress and stress hormones on this colour change. Frogs were subjected to four different levels of stressors (handling, toe-clipping, saline injection and adrenocorticotropic hormone [ACTH] injection) and the colour change wasmeasured using digital photography. A comparison of baseline colour and stress hormone (corticosterone) levels was also conducted to give further insight to this topic. From the images, the Red Blue Green (RGB) colour values were calculated, and a principal components analysis (PCA) was used to create a single colour metric (the major axis) as an index of colour in the visible spectrum. A moderate stressor (toe-clipping) led to a significant change in colour (within 10 min) similar to that of amplecting males. Surprisingly, neither a mild stressor (handling and saline injection) nor the maximum stressor (handling and ACTH injection) led to a lightening response. This study confirms that the dynamic male colour change in this species in response to medium stressors adds new knowledge to the understanding of the functional mechanisms of dynamic colour change in amphibians.
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    Journal Title
    Comparative Biochemistry and Physiology. Part A: Molecular & Integrative Physiology
    Volume
    165
    Issue
    2
    DOI
    https://doi.org/10.1016/j.cbpa.2013.03.011
    Copyright Statement
    © 2013 Elsevier. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
    Subject
    Behavioural Ecology
    Ecological Physiology
    Comparative Physiology
    Biochemistry and Cell Biology
    Physiology
    Zoology
    Publication URI
    http://hdl.handle.net/10072/54822
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    • Journal articles

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