Du är här

What can box jellyfish tell us about early eye evolution?

Publiceringsår: 2006
Språk: Engelska
Sidor: 167-167
Publikation/Tidskrift/Serie: Perception
Volym: 35
Dokumenttyp: Artikel
Förlag: Pion Ltd

Sammanfattning

The eyes of visually prominent animals such as vertebrates, cephalopods, and arthropods generally subserve a multitude of visual tasks. Naturally, early stages in the evolution of these complex visual organs must have been simpler, and subserved a smaller number of visual tasks. Hence, eye evolution is driven by a consecutive accumulation of visual tasks. Each task adds to the requirements on eye structure, making it gradually more complex. For these reasons, reconstructions of eye evolution should ideally be based on an understanding of the sequential addition of visual tasks. In particular, it is interesting to ask what the first visual tasks might have been, and what requirements these would have placed on the structure and function of early eyes. With this objective, we have investigated vision in a group of simple and phylogenetically basal animals, the box jellyfish. Behavioural experiments indicate that these animals use vision primarily for positioning in the habitat, and for negotiating obstacles. To serve these tasks, the eyes are tuned for low spatial frequencies and are colour-blind. The findings indicate that low resolution is not just sufficient, but in fact desirable in early stages of eye evolution.

Disputation

Nyckelord

  • Biology and Life Sciences

Övriga

Published
Yes
  • Lund Vision Group
  • ISSN: 0301-0066
  • ISSN: 1468-4233

Box 117, 221 00 LUND
Telefon 046-222 00 00 (växel)
Telefax 046-222 47 20
lu [at] lu [dot] se

 

Fakturaadress: Box 188, 221 00 LUND
Organisationsnummer: 202100-3211
Om webbplatsen