title: Limited transfer of uranium to higher trophic levels by Gammarus pulex L. in contaminated environments.
abstract: In contrast to the classification of most invertebrate shredders being sensitive to uranium, a G. pulex L. population with reproduction was found in a stream at a former uranium mining site with uranium concentrations of 150 microg l(-1) in water and up to 2000 mg kg(-1) DW(-1) (dry weight) in litter born organic sediments. The survival of G. pulex, collected from a site without uranium contamination, was tested in a laboratory microcosm experiment using synthetic uranium-contaminated water and uranium-contaminated but nutrient rich food, simulating physicochemical conditions of water from former uranium mining sites. The results reveal that there are no significant differences in survival rate between individuals exposed and those not exposed to uranium. The uptake of uranium by G. pulex in environments with concentrations in food of 1152 mg kg(-1) in DM (dry mass, organically bound) and in water of 63.9 microg L(-1) is very low (4.48(1.93-8.46) mg kg(-1) in DM). The accumulation of uranium in these invertebrates was verified to be via two pathways: body surface and food. A relevant amount of uranium adsorbs to the body surface where it can readily be desorbed.
authors.affiliation: Dresden University of Technology, Institute of General Ecology and Environmental Protection, Tharandt, D-01062 Dresden, Germany. schaller@forst.tu-dresden.de
authors.forename: Jörg
authors.initials: J
authors.lastname: Schaller
authors.forename: Carsten
authors.initials: C
authors.lastname: Brackhage
authors.forename: E Gert
authors.initials: EG
authors.lastname: Dudel
mesh_terms: D029661:Alnus / Q000737:chemistry; D033304:Amphipoda / Q000187:drug effects / Q000378:metabolism*; D000818:Animals; D004784:Environmental Monitoring; D020387:Food Chain; D019015:Geologic Sediments / Q000737:chemistry; D008906:Mining; D018515:Plant Leaves / Q000737:chemistry; D014501:Uranium / Q000378:metabolism* / Q000633:toxicity; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000378:metabolism* / Q000633:toxicity
chemical_list: D014874:Water Pollutants, Chemical; D014867:Water; D014501:Uranium