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
✍ Scribed by J. -C. Amiard
- Publisher
- Springer-Verlag
- Year
- 1976
- Tongue
- English
- Weight
- 475 KB
- Volume
- 34
- Category
- Article
- ISSN
- 0025-3162
No coin nor oath required. For personal study only.
✦ Synopsis
Phototactic Variations in Crustacean Larvae Due to Diverse Metallic Pollutants: Demonstrated by a Sublethal Toxicity Test
Variations in orientation and photokinesis of Car~nus 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 CoCI 2 and AgNO 3 in the range O.O1 to O.1 mg/l, and by excess SrCI 2 in the order of 1OO mg/l. For p. serratus Zoea I, the corresponding values were 1OO to 500 mg/l COC12, 100 mg/l AgNO3, and above 500 mg/l SrCI 2. c. maenas photokinesis was decreased by amounts of O.OO1 mg/l of CoCI 2 or AgNO 3 within a period of only 2 to 3 days.