Temperature, but Not Available Energy, Affects the Expression of a Sexually Selected Ultraviolet (UV) Colour Trait in Male European Green Lizards

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Bajer , K , Molnar , O , Török , J & Herczeg , G 2012 , ' Temperature, but Not Available Energy, Affects the Expression of a Sexually Selected Ultraviolet (UV) Colour Trait in Male European Green Lizards ' , PLoS One , vol. 7 , no. 3 , pp. e34359 . https://doi.org/10.1371/journal.pone.0034359

Title: Temperature, but Not Available Energy, Affects the Expression of a Sexually Selected Ultraviolet (UV) Colour Trait in Male European Green Lizards
Author: Bajer, Katalin; Molnar, Orsolya; Török, Janos; Herczeg, Gabor
Other contributor: University of Helsinki, Ecology and Evolutionary Biology

Date: 2012-03-27
Language: eng
Number of pages: 7
Belongs to series: PLoS One
ISSN: 1932-6203
DOI: https://doi.org/10.1371/journal.pone.0034359
URI: http://hdl.handle.net/10138/39163
Abstract: Background Colour signals are widely used in intraspecific communication and often linked to individual fitness. The development of some pigment-based (e.g. carotenoids) colours is often environment-dependent and costly for the signaller, however, for structural colours (e.g. ultraviolet [UV]) this topic is poorly understood, especially in terrestrial ectothermic vertebrates. Methodology/Principal Findings In a factorial experiment, we studied how available energy and time at elevated body temperature affects the annual expression of the nuptial throat colour patch in male European green lizards (Lacerta viridis) after hibernation and before mating season. In this species, there is a female preference for males with high throat UV reflectance, and males with high UV reflectance are more likely to win fights. We found that (i) while food shortage decreased lizards' body condition, it did not affect colour development, and (ii) the available time for maintaining high body temperature affected the development of UV colour without affecting body condition or other colour traits. Conclusions/Significance Our results demonstrate that the expression of a sexually selected structural colour signal depends on the time at elevated body temperature affecting physiological performance but not on available energy gained from food per se in an ectothermic vertebrate. We suggest that the effect of high ambient temperature on UV colour in male L. viridis makes it an honest signal, because success in acquiring thermally favourable territories and/or effective behavioural thermoregulation can both be linked to individual quality.
Subject: DERMAL COLLAGEN ARRAYS
PLUMAGE COLORATION
STRUCTURAL COLORATION
NUTRITIONAL CONDITION
CONDITION-DEPENDENCE
MATE PREFERENCES
CONVERGENT EVOLUTION
NUPTIAL COLORATION
LACERTA-MONTICOLA
NATURAL-SELECTION
1181 Ecology, evolutionary biology
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