Visual effects in great bowerbird sexual displays and their implications for signal design

Endler, John A., Gaburro, Julie, and Kelley, Laura A. (2014) Visual effects in great bowerbird sexual displays and their implications for signal design. Proceedings of the Royal Society of London Series B, Biological Sciences, 281 (1783). 20140235. pp. 1-9.

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Abstract

It is often assumed that the primary purpose of a male's sexual display is to provide information about quality, or to strongly stimulate prospective mates, but other functions of courtship displays have been relatively neglected. Male great bowerbirds (Ptilonorhynchus nuchalis) construct bowers that exploit the female's predictable field of view (FOV) during courtship displays by creating forced perspective illusions, and the quality of illusion is a good predictor of mating success. Here, we present and discuss two additional components of male courtship displays that use the female's predetermined viewpoint: (i) the rapid and diverse flashing of coloured objects within her FOV and (ii) chromatic adaptation of the female's eyes that alters her perception of the colour of the displayed objects. Neither is directly related to mating success, but both are likely to increase signal efficacy, and may also be associated with attracting and holding the female's attention. Signal efficacy is constrained by trade-offs between the signal components; there are both positive and negative interactions within multicomponent signals. Important signal components may have a threshold effect on fitness rather than the often assumed linear relationship.

Item ID: 33754
Item Type: Article (Research - C1)
ISSN: 1471-2954
Keywords: bowerbird, sexual display, visual effects, illusions, holding attention, constraints
Funders: Australian Research Council (ARC), National Science Foundation (NSF), Deakin University
Date Deposited: 18 Jun 2014 09:39
FoR Codes: 06 BIOLOGICAL SCIENCES > 0603 Evolutionary Biology > 060399 Evolutionary Biology not elsewhere classified @ 50%
06 BIOLOGICAL SCIENCES > 0602 Ecology > 060201 Behavioural Ecology @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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