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The relative importance of body size and UV coloration in influencing male-male competition in a lacertid lizard

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Abstract

Communication via color signals is common in natural systems. Ultraviolet (UV)-blue patches located on the outer-ventral scales of some lacertid lizards are thought to be involved in male-male competition. However, the mechanisms that maintain their honesty remain unknown. Here, we use the common wall lizard Podarcis muralis to test whether the lateral UV-blue spots are conventional signals, the honesty of which is guaranteed by receiver-dependent costs, and discuss their potential role as an amplifier of body size. We first described the morphology and reflectance properties of lateral UV-blue spots in common wall lizards and investigated how they influence male-male competition. Spot size and number, UV chroma, and conspicuousness (calculated using vision models) were significantly greater in adult males relative to adult females and adult males relative to juveniles. Total spot area (and not spot number) of adult males was positively correlated with body size. We conducted staged competition encounters between focal males and smaller or larger rivals with control or manipulated spots. Spots were enlarged in small rivals and reduced in large rivals to disrupt the phenotypic correlation between spot area and body size. Aggressiveness and dominance were positively influenced by body size in control encounters. Spot manipulations resulted in greater submission and less aggressiveness in focal males. These results contradict the predictions associated with conventional signals and amplifiers, but suggest that spots contributed to opponent evaluation during short-distance encounters between competing males.

Significance statement

Many animals use color to communicate. During intraspecific resource competition, some species use color signals as an assessment tool to determine if they should engage in or avoid conflicts. Studies have found that in non-mammalian vertebrates, UV coloration can be a good indicator of fighting ability or aggressiveness. We tested whether and how the UV-blue spots of common wall lizards play a role in male-male competition by studying the properties of their spots, and then used that information to design and conduct competition experiments between males involving spot manipulation. Both body size and spot manipulation influenced aggression and submission during encounters. In particular, results suggest that spot manipulation disrupted mutual assessment and thus that spots play a role in competition signaling in male common wall lizards.

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Acknowledgments

We thank Cécile Vande Maele, Samuel Perret, and Beatriz Decencière Ferrandière for their help in the laboratory. We also thank the reviewers for their comments, which helped to improve the quality of the manuscript.

Funding

This research was supported by the Centre National de la Recherche Scientifique (CNRS).

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Authors and Affiliations

  1. Sorbonne Université, CNRS, IRD, INRA, Institut d’écologie et des sciences de l’environnement (IEES), Paris, France

    Gabrielle Names, Mélissa Martin, Arnaud Badiane & Jean-François Le Galliard

  2. Centre de recherche en écologie expérimentale et prédictive (CEREEP-Ecotron IleDeFrance), Ecole Normale Supérieure, CNRS, PSL Research University, UMS 3194, 78 rue du château, 77140, Saint-Pierre-lès-Nemours, France

    Gabrielle Names & Jean-François Le Galliard

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  1. Gabrielle Names
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  2. Mélissa Martin
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Correspondence to Gabrielle Names.

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Ethical approval

Authorization No. Ce5/2011/044 allowed us to capture and manipulate wild animals for this study. Ethical approval from an ethics committee was not necessary. All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution at which the studies were conducted.

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Names, G., Martin, M., Badiane, A. et al. The relative importance of body size and UV coloration in influencing male-male competition in a lacertid lizard. Behav Ecol Sociobiol 73, 98 (2019). https://doi.org/10.1007/s00265-019-2710-z

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