title: Sediment copper bioavailability to freshwater snails in south Florida: risk implications for the Everglade snail kite (Rostrhamus sociabilis plumbeus).
abstract: Many properties being acquired as part of the Comprehensive Everglades Restoration Plan (CERP) are heavily contaminated with copper. Estimated copper bioaccumulation in the Florida apple snail (Pomacea paludosa) has led to the prediction of risk to the Everglade snail kite (Rostrhamus sociabilis plumbeus) at some CERP projects. Field study results presented in this paper examine the relationship between copper levels in sediments, snails, and other biota. Copper concentrations in all biota (snails, aquatic vascular plants, and periphyton) were strongly correlated with those in sediments. No correlation with water copper concentrations was evident. Mean copper concentrations in snails ranged from 23.9 mg/kg at the reference site to 732 mg/kg at a high copper site. Calculated biota-sediment accumulation factors (BSAFs) ranged from 36.7 to 7.0 over the range of copper levels in sediments. BSAFs were highest at low copper levels in sediments and declined sharply as copper levels in sediment increased. Risk for the snail kite is discussed in light of the results of this study.
authors.affiliation: Environmental Contaminants Program, U.S. Fish and Wildlife Service, 1339 20th Street, Vero Beach, FL 32960, USA. robert_frakes@fws.gov
authors.forename: Robert A
authors.initials: RA
authors.lastname: Frakes
authors.forename: Timothy A
authors.initials: TA
authors.lastname: Bargar
authors.forename: Emily A
authors.initials: EA
authors.lastname: Bauer
mesh_terms: D000818:Animals; D003247:Conservation of Natural Resources / Q000331:legislation & jurisprudence / Q000379:methods; D003300:Copper / Q000032:analysis / Q000633:toxicity*; D046093:Falconiformes / Q000254:growth & development* / Q000378:metabolism; D005431:Florida; D020387:Food Chain; D005618:Fresh Water / Q000737:chemistry*; D019015:Geologic Sediments / Q000737:chemistry*; D006078:Government Programs; D018570:Risk Assessment; D012908:Snails / Q000187:drug effects* / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000633:toxicity*; D053833:Wetlands
chemical_list: D014874:Water Pollutants, Chemical; D003300:Copper