Sublethal exposure to cadmium interferes with cover-seeking behavior of juvenile crayfish, Procambarus clarkii (Girard)
- Edinboro Univ., PA (United States). Dept. of Biology and Health Services
The behavioral effects of heavy metals on crayfishes may significantly affect their survival in the environment. Changes in their ability to remain under cover could substantially decrease their survivorship due to increased predation. The effect of sublethal cadmium exposure on the ability of juvenile crayfish to remain in cover was evaluated. Four different treatment groups wee used: a control group and three experimental groups exposed to 1, 2, or 3 mg Cd/L for 7 d. Crayfish were placed, individually, into glass aquaria containing 3 L of laboratory water pre-treated to detoxify all heavy metals, with continuous aeration. Each crayfish was provided with a dark, thigmotactic shelter. Cadmium was introduced into the aquaria on days 1 and 4 to maintain the nominal concentrations. Beginning on day 5 and continuing through day 7, observations were taken on each crayfish five times per day, with a minimum of 30 minutes between observations. Crayfish position was recorded as in cover or in the open area of an aquarium. Juveniles in the control groups were in cover 78.35 of the observations. Over the 3 d of observations, juveniles in the 1 mg Cd/L exposure groups used cover 72.1%. Those in the 2 and 3 mg Cd/L groups used cover 53.9% and 60%, respectively, indicating hyperactivity induced by cadmium exposure. Examining the daily results, however, those juveniles in the 1 mg Cd/L group were in cover only 60% of the time by day 7, indicating a latency to produce hyperactivity at this concentration.
- OSTI ID:
- 495388
- Report Number(s):
- CONF-9504216-; TRN: IM9731%%81
- Resource Relation:
- Conference: 5. Environmental toxicology and risk assessment: biomarkers and risk assessment, Denver, CO (United States), 2-7 Apr 1995; Other Information: PBD: 1996; Related Information: Is Part Of Environmental toxicology and risk assessment: Biomarkers and risk assessment. Volume 5; Bengtson, D.A.; Henshel, D.S. [eds.]; PB: [485] p.; ASTM special technical publication, 1306
- Country of Publication:
- United States
- Language:
- English
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