title: Copper uptake and depuration by juvenile and adult Florida apple snails (Pomacea paludosa).
abstract: The present study characterized copper (Cu) uptake and depuration by juvenile and adult Florida apple snails (Pomacea paludosa) from water, soil, and diet. During a 28-day uptake period, juvenile apple snails were exposed to aqueous Cu and adult apple snails were exposed to Cu-contaminated soil, water, and food. In the follow-up 14-day depuration period, both juvenile and adult apple snails were held in laboratory freshwater with background Cu concentrations<4 microg/l. For juvenile apple snails, whole body Cu concentrations increased with time and reached a plateau after 14 days. The data followed Michaelis-Menten kinetics rather than a one compartment first order kinetics model. The mean Cu bioconcentration factor (BCF) for juvenile apple snails was 1493 and the depuration half-life was 10.5-13.8 days. For adult snails, dietary uptake of Cu resulted in higher bioaccumulation factors (BAFs) compared to uptake from soil. Most of the accumulated Cu was located in soft tissue (about 60% in the viscera and 40% in the foot). The shell contained <1% of the total accumulated copper. Soft tissue is usually consumed by predators of the apple snail. Therefore, the results of the present study show that Cu transfer through the food chain to the apple snail may lead to potential risk to its predators.
authors.affiliation: Department of Environmental Studies, Ecotoxicology & Risk Assessment Laboratory, Southeast Environmental Research Center, Florida International University, Biscayne Bay Campus, 3000 NE 151st Street, North Miami, FL 33181, USA.
authors.forename: Tham C
authors.initials: TC
authors.lastname: Hoang
authors.forename: Emily C
authors.initials: EC
authors.lastname: Rogevich
authors.forename: Gary M
authors.initials: GM
authors.lastname: Rand
authors.forename: Robert A
authors.initials: RA
authors.lastname: Frakes
mesh_terms: D000818:Animals; D001673:Biodegradation, Environmental; D003247:Conservation of Natural Resources / Q000331:legislation & jurisprudence / Q000379:methods; D003300:Copper / Q000032:analysis*; D004784:Environmental Monitoring; D005431:Florida; D020387:Food Chain; D006078:Government Programs; D012908:Snails / Q000254:growth & development* / Q000378:metabolism; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D003300:Copper