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Luminescence in ophiuroids (Echinodermata) does not share a common nervous control in all species

Y. Dewael^* and J. Mallefet

Laboratory of Animal Physiology, Catholic University of Louvain, Bâtiment Carnoy, 5 Place Croix du Sud, B-1348 Louvain-la-Neuve, Belgium

View larger version (19K): [in a new window]   Fig. 1. Representative original recordings of light pattern by an arm segment stimulated by KCl (200 mmol l–1). (A) A. filiformis, (B) O. aranea, (C) O. californica. Intensity of light emitted is expressed in Mquanta s–1 mm–1 arm.

View larger version (11K): [in a new window]   Fig. 2. Representative original recording of the light pattern produced by an arm segment of A. filiformis stimulated by acetylcholine (1 mmol l–1). Intensity of light emitted is expressed in Mquanta s–1 mm–1 arm.

View larger version (9K): [in a new window]   Fig. 3. Effect of actylcholine (ACh) concentration on luminescence of arm segments from A. filiformis. Values are means ± S.E.M., expressed as a percentage of photogenesis triggered by 1 mmol l–1 ACh.

View larger version (11K): [in a new window]   Fig. 4. Dose-dependent inhibitory effect of atropine and tubocurarine on 1 mmol l–1 ACh-induced luminescence from arm segment of A. filiformis. Values are means + S.E.M. of maximal intensities of light emitted, expressed as a percentage of those measured in control arm segments, not treated with cholinergic antagonists. Asterisks indicate significant differences between control and treated arm segments (*P<0.05, **P<0.01).

View larger version (10K): [in a new window]   Fig. 5. Dose-dependent inhibitory effect of pirenzepine on 1 mmol l–1 ACh-induced luminescence from arm segment of A. filiformis. Values are means ± S.E.M. of maximal intensities of light emitted, expressed as a percentage of those measured in control arm segments, not treated with cholinergic antagonists. **Significant difference between control and treated arm segments (P<0.01).

View larger version (13K): [in a new window]   Fig. 6. Dose-dependent effect of 4-DAMP on 1 mmol l–1 ACh-induced luminescence from arm segment of A. filiformis. Bars show the average intensity of maximal light emitted after injection of 4-DAMP. Diamonds show the average intensity of light emitted induced by ACh. Maximal intensities of light emitted are expressed as a percentage of those measured in control arm segments, not treated with 4-DAMP.

View larger version (9K): [in a new window]   Fig. 7. Dose-dependent emission of light from arm segment of A. filiformis in response to McN. Values are means ± S.E.M. of maximal intensities of light emitted, expressed as a percentage of those measured in control arm segments, stimulated with 1 mmol l–1 ACh.