Combining motions into complex displays

Playbacks with a robotic lizard

Emilia Martins, Terry J. Ord, Sarah W. Davenport

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

Complex displays composed of multiple, seemingly independent, units can result from sexual selection for increasingly variable, but redundant, displays and from potentially opposing selective pressures imposed by use of the display in multiple contexts. Our playback results support the latter, multireceiver hypothesis by confirming that two aspects of the sagebrush lizard headbob display (number of headbobs and use of display-specific body postures) are independently-meaningful components that are interpreted differently by different receivers. Male receivers use species-typical body postures to distinguish between aggressive and broadcast forms of the display, whereas female receivers are more attentive to the number of headbob motions, using these to distinguish male courtship from a challenge from a female competitor. Thus, display components are likely subject to different selective pressures and the display as a whole is evolving in response to a complex selective regime. Our example differs from other complex signals that have been considered in that both display elements involve dynamic motions (turned on and off by the display producer) as opposed to static signal elements (e.g., color, size). In addition, we found evidence that display structure is highly malleable, and that lizards both produce and respond to artificial displays that violate syntactic rules identified from field observations. Finally, our experiments demonstrate that a robotic lizard can be used effectively in playback studies of visual display behavior in lizards.

Original languageEnglish (US)
Pages (from-to)351-360
Number of pages10
JournalBehavioral Ecology and Sociobiology
Volume58
Issue number4
DOIs
StatePublished - Aug 1 2005
Externally publishedYes

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robotics
lizard
lizards
posture
display behavior
courtship
Artemisia
sexual selection
color
experiment

Keywords

  • Behavior
  • Communication
  • Evolution
  • Lizard
  • Robot playback
  • Sceloporus graciosus
  • Sexual selection

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

Cite this

Combining motions into complex displays : Playbacks with a robotic lizard. / Martins, Emilia; Ord, Terry J.; Davenport, Sarah W.

In: Behavioral Ecology and Sociobiology, Vol. 58, No. 4, 01.08.2005, p. 351-360.

Research output: Contribution to journalArticle

Martins, Emilia ; Ord, Terry J. ; Davenport, Sarah W. / Combining motions into complex displays : Playbacks with a robotic lizard. In: Behavioral Ecology and Sociobiology. 2005 ; Vol. 58, No. 4. pp. 351-360.
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