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An inexpensive depth gauge for marine animals |
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| Authors: | R P Wilson A E Burger B L H Wilson M -P T Wilson C Nöldeke |
| Institution: | (1) Institut für Meereskunde an der Universität Kiel, Düsternbrooker Weg 20, D-2300 Kiel 1, FRG;(2) Department of Zoology, University of Göteborg, P.O. Box 25-59, S-40031 Göteborg, Sweden;(3) Bamfield Marine Station, V0R 1B0 Bamfield, British Columbia, Canada;(4) The Armada House, Weston, NN12 8PU Towcester, Northants, UK;(5) Institut für Experimentalphysik, Leibnizstraße 19, D-2300 Kiel 1, FRG;(6) Present address: Institut für Meereskunde an der Universität Kiel Düsternbrooker Weg 20, D-2300 Kiel 1, FRG;(7) Present address: Department of Biology, University of Victoria, V8W 2Y2 Victoria, British Columbia, Canada |
| Abstract: | Current models of time-at-depth gauges are so expensive that few can be deployed and only limited data obtained. We describe an inexpensive depth gauge for use on marine animals, which we tested on diving birds. The device was constructed from components costing  $2 (US); and had a mass of 6 g. The gauge employs photographic film to record the depth-dependent position of a light emitting diode. The total time that the animal spends at each depth underwater can be determined. |
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