Toxicity of pulse exposures of zinc, cadmium, and copper to pre-exposed trout and Daphnia

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:37435

Cohen, A S; Hockett, J R; Stubblefield, W A ^[1]; Mount, D R ^[2]

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1. ENSR Consulting and Engineering, Fort Collins, CO (United States)
2. National Biological Survey, Columbia, MO (United States)

Previous studies have demonstrated that the sensitivity of fish to metals decreases following pre-exposure to sub-lethal concentrations. However, little information is available regarding the acclimatory capacity of invertebrate species or the ability of organisms to withstand brief (< 96 hr), high concentration pulse exposures to metals. Studies were conducted to investigate these issues. Groups of rainbow and brown trout were exposed for 1 0 days to single metals (Zn, Cu, and Cd) concentrations equal to 0.5 of the previously determined Incipient Lethal Level (ILL). Daphnia were similarly exposed for 24 hours to 0.5 of the predetermined 48-hr LC{sub 50}. Pre-exposed and naive (nonexposed) trout and D. magna were challenged with single 4-hr pulse exposures to each metal; organisms were monitored for a total of 96 and 48 hrs, respectively. Study results confirm a general increase in the ability of pre-exposed trout and D. magna to withstand subsequent pulse exposures. The magnitude of acquired tolerance varied depending on species and metal, but generally ranged from 1.2 to 5.9 times that of naive organisms.

• OSTI ID: 37435
• Report Number(s): CONF-9410273--
• Country of Publication: United States
• Language: English

Related Subjects

56 BIOLOGY AND MEDICINE
APPLIED STUDIES
CADMIUM
COPPER
DAPHNIA
SENSITIVITY
TOXICITY
TROUT
WATER POLLUTION
ZINC