Effects of vestibular nerve transection on the calcium incorporation of fish otoliths. |
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Authors: | R H Anken E Edelmann H Rahmann |
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Institution: | Zoological Institute, University of Stuttgart-Hohenheim, Garbenstr. 30, D-70593, Stuttgart, Germany. |
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Abstract: | Previous investigations revealed that the growth of fish inner ear otoliths (otolith size and calcium-incorporation) depends on the amplitude and the direction of gravity, suggesting the existence of a (negative) feedback mechanism. In search for the regulating unit, the vestibular nerve was transacted unilaterally in neonate swordtail fish (Xiphophorus helleri) which were subsequently incubated in the calcium-tracer alizarin-complexone. Calcium incorporation ceased on the transacted head sides, indicating that calcium uptake is neurally regulated. Grant numbers: 50 WB 9533, 50 WB 9997. |
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