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Evolutionary fine-tuning of background-matching camouflage among geographical populations in the sandy beach tiger beetle.
Yamamoto, Nayuta; Sota, Teiji.
Afiliación
  • Yamamoto N; Department of Zoology, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
  • Sota T; Department of Zoology, Graduate School of Science, Kyoto University, Sakyo, Kyoto 606-8502, Japan.
Proc Biol Sci ; 287(1941): 20202315, 2020 12 23.
Article en En | MEDLINE | ID: mdl-33323087
Background-matching camouflage is a widespread adaptation in animals; however, few studies have thoroughly examined its evolutionary process and consequences. The tiger beetle Chaetodera laetescripta exhibits pronounced variation in elytral colour pattern among sandy habitats of different colour in the Japanese Archipelago. In this study, we performed digital image analysis with avian vision modelling to demonstrate that elytral luminance, which is attributed to proportions of elytral colour components, is fine-tuned to match local backgrounds. Field predation experiments with model beetles showed that better luminance matching resulted in a lower attack rate and corresponding lower mortality. Using restriction site-associated DNA (RAD) sequence data, we analysed the dispersal and evolution of colour pattern across geographical locations. We found that sand colour matching occurred irrespective of genetic and geographical distances between populations, suggesting that locally adapted colour patterns evolved after the colonization of these habitats. Given that beetle elytral colour patterns presumably have a quantitative genetic basis, our findings demonstrate that fine-tuning of background-matching camouflage to local habitat conditions can be attained through selection by visual predators, as predicted by the earliest proponent of natural selection.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Escarabajos / Pigmentación / Mimetismo Biológico Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Proc Biol Sci Asunto de la revista: BIOLOGIA Año: 2020 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Escarabajos / Pigmentación / Mimetismo Biológico Tipo de estudio: Prognostic_studies Límite: Animals Idioma: En Revista: Proc Biol Sci Asunto de la revista: BIOLOGIA Año: 2020 Tipo del documento: Article País de afiliación: Japón Pais de publicación: Reino Unido