Effects of copper pre-exposure routes on the energy reserves and subsequent copper toxicity in Daphnia magna

• Published in: Environmental toxicology Vol. 21; no. 5; pp. 521 - 527
• Main Author: Canli, M.
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 01.10.2006; Wiley
• Subjects: algae; Animal, plant and microbial ecology; Animals; Applied ecology; Biological and medical sciences; Chlorophyta - metabolism; Confidence Intervals; copper; Copper - metabolism; Copper - toxicity; Daphnia - drug effects; Daphnia - metabolism; Daphnia magna; dietary; Ecotoxicology, biological effects of pollution; Energy Metabolism - drug effects; Environmental Exposure; Fundamental and applied biological sciences. Psychology; General aspects; Glucose - metabolism; Lipid Metabolism - drug effects; Proteins - metabolism; toxicity; water-borne; water-borne; Ecotoxicology; Toxicity; Algae; Cladocera; Feeding; Heavy metal; Crustacea; Diet; dietary; Arthropoda; Environment; Invertebrata; Copper; Branchiopoda; Daphnia magna; Thallophyta; Metabolic storage
• ISSN: 1520-4081; 1522-7278
• DOI: 10.1002/tox.20214

The hypothesis was tested that copper uptake routes affect the tolerance of Daphnia magna to copper and influence the energy reserves. These were determined in D. magna juveniles that had been exposed for 4 days to water borne and/or dietary copper (algae Pseudokichneriella subcapitata loaded with copper) at nominal concentrations of 0, 10, and 100 nM. Tolerance increased with dietary copper pre‐exposure reflected in 24 and 48 h LC50 values of 466 and 398 nM at 100 nM pre‐exposure versus 301 and 254 nM in controls, respectively. Control animals (no copper added to their exposure medium and diet) had the lowest lipid content and consequently the lowest energy content. The current study stresses the importance of addressing dietary exposure routes in metal toxicity assessments. © 2006 Wiley Periodicals, Inc. Environ Toxicol 21: 521–527, 2006.