2026-06-08T11:02:59Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/1127242026-04-15T09:27:31Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Megía Palma, Rodrigo Manuel
author
Barrientos Yuste, Rafael
author
Gallardo, Manuela
author
Martínez González, Francisco José
author
Merino, Santiago
2024-12-17T09:23:12Z
2024-12-17T09:23:12Z
2021
Megía-Palma, Rodrigo, et al. «Brighter Is Darker: The Hamilton–Zuk Hypothesis Revisited in Lizards». Biological Journal of the Linnean Society, vol. 134, n.o 2, septiembre de 2021, pp. 461-73. DOI.org (Crossref), https://doi.org/10.1093/biolinnean/blab081
0024-4066
10.1093/biolinnean/blab081
https://hdl.handle.net/20.500.14352/112724
https://doi.org/10.1093/biolinnean/blab081
http://hdl.handle.net/10017/59239
Several studies of lizards have made an erroneous interpretation of negative relationships between spectral brightness and parasite load, and thus provided misleading support for the Hamilton–Zuk hypothesis (HZH). The HZH predicts that infected hosts will produce poorer sexual ornamentation than uninfected individuals as a result of energetic trade-offs between immune and signalling functions. To test whether there is a negative relationship between spectral brightness and pigment content in the skin of lizards, we used spectrophotometry to quantify the changes in spectral brightness of colour patches of two species after chemically manipulating the contents of orange, yellow and black pigments in skin samples. Carotenoids were identified using high-performance liquid chromatography. In addition, we compared the spectral brightness in the colour patches of live individuals with differential expression of nuptial coloration. Overall, the analyses demonstrated that the more pigmented the colour patch, the darker the spectrum. We provide a comprehensive interpretation of how variation in pigment content affects the spectral brightness of the colour patches of lizards. Furthermore, we review 18 studies of lizards presenting 24 intraspecific tests of the HZH and show that 14 (58%) of the tests do not support the hypothesis.
eng
Brighter is darker, the Hamilton-Zuk hypothesis revisited in lizards
journal article
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URL
https://docta.ucm.es/bitstreams/a1f0b00a-8f30-43b7-87c8-3c5bb5d70099/download
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application/pdf
Megía-Palma (2021) Brighter is darker, the Hamilton-Zuk hypothesis revisited in lizards.pdf
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https://docta.ucm.es/bitstreams/3762ff61-37d2-4c34-9ee1-a3f3f3fb1e46/download
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04f170630c357fe811aa475de067af00
66471
text/plain
Megía-Palma (2021) Brighter is darker, the Hamilton-Zuk hypothesis revisited in lizards.pdf.txt