Phototactic response and light sensitivity in an epigean and a hypogean population of a barb (Garra barreimiae, Cyprinidae) |
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| Authors: | Mirna Timmermann and Martin Plath |
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| Institution: | (1) Biozentrum Grindel und Zoologisches Museum der Universit?t Hamburg, Martin-Luther-King Platz 3, 20146 Hamburg, Germany;(2) Department of Zoology, University of Oklahoma, 730 Van Vleet Oval, Norman, OK 73019, USA;(3) Unit of Evolutionary Biology and Systematic Zoology, Institute of Biochemistry and Biology, University of Potsdam, Karl-Liebknecht-Str. 24–25, 14476 Potsdam, Germany;(4) Present address: Unit of Animal Ecology, Institute of Biochemistry and Biology, University of Potsdam, Maulbeerallee 1, 14469 Potsdam, Germany; |
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| 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. |
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| Keywords: | Cave colonization Cavefish Oman Phototaxis Scotophilia |
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