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Anatomical and physiological evidence for polarisation vision in the nocturnal bee Megalopta genalis

Författare:
  • Birgit Greiner
  • Thomas W. Cronin
  • Willi A. Ribi
  • William T. Wcislo
  • Eric Warrant
Publiceringsår: 2007
Språk: Engelska
Sidor: 591-600
Publikation/Tidskrift/Serie: Journal of Comparative Physiology A: Neuroethology, Sensory, Neural, and Behavioral Physiology
Volym: 193
Nummer: 6
Dokumenttyp: Artikel
Förlag: Springer

Sammanfattning

The presence of a specialised dorsal rim area with an ability to detect the e-vector orientation of polarised light is shown for the first time in a nocturnal hymenopteran. The dorsal rim area of the halictid bee Megalopta genalis features a number of characteristic anatomical specialisations including an increased rhabdom diameter and a lack of primary screening pigments. Optically, these specialisations result in wide spatial receptive fields (Delta rho = 14 degrees), a common adaptation found in the dorsal rim areas of insects used to filter out interfering effects (i.e. clouds) from the sky. In this specialised eye region all nine photoreceptors contribute their microvilli to the entire length of the ommatidia. These orthogonally directed microvilli are anatomically arranged in an almost linear, anterior-posterior orientation. Intracellular recordings within the dorsal rim area show very high polarisation sensitivity and a sensitivity peak within the ultraviolet part of the spectrum.

Disputation

Nyckelord

  • Biology and Life Sciences
  • dorsal rim area
  • dim light vision
  • nocturnal navigation
  • insects
  • polarisation sensitivity

Övriga

Published
Yes
  • Lund Vision Group
  • ISSN: 0340-7594

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