Aquatic Ecology

, Volume 43, Issue 2, pp 539–547

Phototactic response and light sensitivity in an epigean and a hypogean population of a barb (Garra barreimiae, Cyprinidae)

Article

DOI: 10.1007/s10452-008-9173-z

Cite this article as:
Timmermann, M. & Plath, M. Aquat Ecol (2009) 43: 539. doi:10.1007/s10452-008-9173-z

Abstract

We investigated the response of two populations of the barb Garra barreimiae to different light intensities (0.5–2000 lx) from a light source. Adults of both the surface (epigean) and cave (hypogean) G. barreimiae populations show photophobic behavior. A photophobic response in the cave form was seen only at higher light intensities because the cavefish are eyeless and rely on extra-retinal light receptors to detect light. In contrast, juveniles (surface and cave) showed photophilic behavior, and their preference for the photic zone of the test tank decreased with increasing age. We discuss the potential role played by photophobic behavior for the colonization of caves by previously surface-dwelling fishes.

Keywords

Cave colonizationCavefishOmanPhototaxisScotophilia

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Biozentrum Grindel und Zoologisches Museum der Universität HamburgHamburgGermany
  2. 2.Department of ZoologyUniversity of OklahomaNormanUSA
  3. 3.Unit of Evolutionary Biology and Systematic Zoology, Institute of Biochemistry and BiologyUniversity of PotsdamPotsdamGermany
  4. 4.Unit of Animal Ecology, Institute of Biochemistry and BiologyUniversity of PotsdamPotsdamGermany