Abstract
Variations in orientation and photokinesis of Carcinus maenas and Palaemon serratus Zoeas I were studied in the presence of excess cobalt and strontium chlorides or silver nitrate. The speed of movement of larvae toward light (phototaxis) appears to constitute a good parameter for testing sublethal toxicity. The salts are toxic to crab larvae in the following decreasing order of toxicity: silver nitrate, cobalt chloride, strontium chloride. Within 4 days, orientation of C. maenas Zoea I was disturbed by excess CoCl2 and AgNO3 in the range 0.01 to 0.1 mg/l, and by excess SrCl2 in the order of 100 mg/l. For P. serratus Zoea I, the corresponding values were 100 to 500 mg/l CoCl2, 100 mg/l AgNO3, and above 500 mg/l SrCl2. C. maenas photokinesis was decreased by amounts of 0.001 mg/l of CoCl2 or AgNO3 within a period of only 2 to 3 days.
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Communicated by J.M. Pérès, Marseille
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Amiard, J.C. Les variations de la phototaxie des larves de crustacés sous l'action de divers polluants métalliques: mise au point d'un test de toxicité subléthale. Marine Biology 34, 239–245 (1976). https://doi.org/10.1007/BF00388801
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DOI: https://doi.org/10.1007/BF00388801