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Vision in the nocturnal wandering spider Leucorchestris arenicola (Araneae : Sparassidae)

In English

Författare

  • Thomas Norgaard
  • Dan-E Nilsson
  • Joh R Henschel
  • Anders Garm
  • Rüdiger Wehner

Summary, in English

At night the Namib Desert spider Leucorchestris arenicola performs long-distance homing across its sand dune habitat. By disabling all or pairs of the spiders' eight eyes we found that homing ability was severely reduced when vision was fully abolished. Vision, therefore, seems to play a key role in the nocturnal navigational performances of L. arenicola. After excluding two or three pairs of eyes, the spiders were found to be able to navigate successfully using only their lateral eyes or only their anterior median eyes. Measurement of the eyes' visual fields showed that the secondary eyes combined have a near full (panoramic) view of the surroundings. The visual fields of the principal eyes overlap almost completely with those of the anterior lateral eyes. Electroretinogram recordings indicate that each eye type contains a single photopigment with sensitivity peaking at similar to 525 nm in the posterior and anteriomedian eyes, and at similar to 540 nm in the anteriolateral eyes. Theoretical calculations of photon catches showed that the eyes are likely to employ a combination of spatial and temporal pooling in order to function at night. Under starlit conditions, the raw spatial and temporal resolution of the eyes is insufficient for detecting any visual information on structures in the landscape, and bright stars would be the only objects visible to the spiders. However, by summation in space and time, the spiders can rescue enough vision to detect coarse landscape structures. We show that L. arenicola spiders are likely to be using temporal summation to navigate at night.

Publiceringsår

2008

Språk

Engelska

Sidor

816-823

Publikation/Tidskrift/Serie

Journal of Experimental Biology

Volym

211

Issue

5

Dokumenttyp

Artikel i tidskrift

Förlag

The Company of Biologists Ltd

Ämne

  • Zoology

Nyckelord

  • temporal summation
  • sensitivity
  • spectral
  • electroretinogram
  • nocturnal navigation
  • visual field
  • spider navigation

Status

Published

Forskningsgrupp

  • Lund Vision Group

ISBN/ISSN/Övrigt

  • ISSN: 1477-9145