The plunge reaction of the backswimmerNotonecta glauca |
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Authors: | Rudolf Schwind |
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Affiliation: | (1) Zoologisches Institut, Universität Regensburg, D-8400 Regensburg, Federal Republic of Germany |
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Abstract: | Summary A reaction that causes flying backswimmers to dive into the water is described. This plunge reaction consists of the following sequence of movements: the animal briefly (typically for 60 ms) raises the body axis head-up, then tilts downward while spreading out the rowing legs and closing the wings. The backswimmers also exhibit the plunge reaction in the laboratory when they are over a structured surface emitting polarized UV light. Factors that elicit the plunge reaction and affect its course are discussed. |
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