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Osmotropotaxis inDrosophila melanogaster
Authors:Alexander Borst  Martin Heisenberg
Institution:(1) Institut für Genetik und Mikrobiologie, Röntgenring 11, D-8700 Würzburg, Federal Republic of Germany
Abstract:Summary Drosophila melanogaster is able to perform osmotropotaxis under open-loop conditions. With an lsquooptimalrsquo stimulus the average turning tendency to the side of higher concentration corresponds to a circular track with radiusr=0.8 cm. The response amplitude does not decrease within 1 or 2 h. Unilaterally antennectomized flies in an homogeneous odor field show a permanent turning tendency towards their intact side.The smallest concentration ratio to elicit osmotropotaxis in normal flies ranges between 6ratio10 and 9ratio10 at high and between 2ratio10 and 5ratio10 at an about 50 times lower odor intensity. No negative tropotaxis (i.e. turning to the side of lower concentration) is observed, even with strong repellents.
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