Divergence of visual motion detection in diurnal geckos that inhabit bright and dark habitats

Saúl S. Nava, Mirela A. Conway, Emília P. Martins

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

Recent studies of the sensory drive hypothesis suggest that communicative signals evolve readily whereas hange in sensory perception is more constrained by the demands of the physical environment.2. Here, we find that diurnal Sphaerodactylus macrolepis geckos collected from dark, forested habitats were best able to detect motion in very dim light (< 10 lux), whereas geckos collected in brightly-lit coastal areas exhibited optimal motion detection at a much brighter light range 200-300 lux. 3. Motion detection by geckos from both habitat types declined as light intensity increased above 300 lux. These differences were observed after the lizards had been living in a common laboratory environment for 1 full year and are hence unlikely to be due to acclimation effects.4. Light conditions for optimal isual performance match the light conditions of the natural habitats in which the lizards are found. Our results support the suggestion that visual performance may evolve quickly and that the sensory drive process may be best described as repeated coevolution between signals and receiver sensory systems.5. Thus, for animals that inhabit wide ranges of isual habitats, the sensory drive process may potentially act differently on separate visual response properties, resulting in diverse levels of variation and divergence in visual performance and communication systems.

Original languageEnglish (US)
Pages (from-to)794-799
Number of pages6
JournalFunctional Ecology
Volume23
Issue number4
DOIs
StatePublished - Aug 2009

Keywords

  • Divergence
  • Gecko
  • Microhabitat selection
  • Motion detection
  • Sensory drive
  • Visual performance

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

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