HR: 0800h
AN: B11A-0135    [Abstracts]
TI: Uptake and Loss of $^{226}$Ra in Tissues of Freshwater Mussels: A Reciprocal Transplant Experiment Between Two Florida Lakes
AU: * Smoak, J M
EM: smoak@stpt.usf.edu
AF: Environmental Science University of South Florida, 140 7th Ave. South, St. Petersburg, FL 33701
AU: Streubert, M
AF: Environmental Science University of South Florida, 140 7th Ave. South, St. Petersburg, FL 33701
AU: Leeper, D A
EM: doug.leeper@swfwmd.state.fl.us
AF: Southwest Florida Water Management District, 2379 Broad Street, Brooksville, FL 34609
AU: Brenner, M
EM: brenner@ufl.edu
AF: Department of Geological Sciences University of Florida, PO Box 112120, Gainesville, FL 32611
AB: Round Lake near Tampa Florida has received hydrologic supplements of $^{226}$Ra-rich groundwater from the Floridan aquifer for several decades. High $^{226}$Ra activities have been measured in the water column, recent sediments, and shells and tissues of mussels from Round Lake. Commiston Lake has not received groundwater augmentation and displays relatively low $^{226}$Ra activities in its water column, sediments, and mussel shells and tissues. We relocated mussels from Round Lake to Commiston Lake, and vice versa, to examine the uptake and loss of $^{226}$Ra by mussel tissues. Transplanted mussels were collected from each lake every few days. Mussels moved to Round Lake (the $^{226}$Ra-rich lake) showed rapid uptake of $^{226}$Ra over the 68-day experiment. $^{226}$Ra activity quickly approached the levels in mussels that had always lived there. Mussels moved from Round Lake to Commiston Lake showed no significant loss of $^{226}$Ra from their tissues after 68 days.
DE: 1030 Geochemical cycles (0330)
DE: 1040 Isotopic composition/chemistry
DE: 1045 Low-temperature geochemistry
DE: 1065 Trace elements (3670)
SC: Biogeosciences [B]
MN: 2004 AGU Fall Meeting