Increased cadmium excretion in metal-adapted populations of the midge Chironomus riparius (Diptera)

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Environmental Toxicology and Chemistry

DOI:https://doi.org/10.1897/1551-5028(1996)015<0332:ICEIMA>2.3.CO;2· OSTI ID:215605

Postma, J F; Nugteren, P van; Buckert-De Jong, M B ^[1]

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1. Univ. of Amsterdam (Netherlands). Section of Aquatic Ecotoxicology

Cadmium kinetics were studied in cadmium-adapted and nonadapted field populations of the midge Chironomus riparius. Accumulation and elimination experiments were carried out using first-generation laboratory-reared animals. Differences between populations were, therefore, assumed to have a genetic basis. Larvae were dissected to analyze the guts and the remainder of the larvae separately. First-order one-compartment models were not always successful in describing accumulation processes, probably due to acclimation. No interpopulation differences were observed in larval development based on dry weights, whereas some differences existed based on pupation rate. In most cases more than 80% of the total amount of cadmium was found in the guts of all populations. Larvae from cadmium-adapted populations showed a decreased net accumulation rate as well as higher equilibrium values (15--20%) compared to nonadapted populations. In addition, cadmium excretion efficiency was increased for cadmium-adapted larvae, which was due to an increased elimination rate from the guts. It was concluded that exposure to high cadmium concentrations in the field resulted in populations of C. riparius with an increased storage capability and an increased excretion efficiency, especially regarding the guts.

• Sponsoring Organization: USDOE
• OSTI ID: 215605
• Journal Information: Environmental Toxicology and Chemistry, Journal Name: Environmental Toxicology and Chemistry Journal Issue: 3 Vol. 15; ISSN ETOCDK; ISSN 0730-7268
• Country of Publication: United States
• Language: English

Related Subjects

56 BIOLOGY AND MEDICINE
APPLIED STUDIES
BENCH-SCALE EXPERIMENTS
BIOLOGICAL ACCUMULATION
BIOLOGICAL ADAPTATION
CADMIUM
FLIES
TOLERANCE
TOXICITY