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Article
Radium-226 accumulation in Florida freshwater mussels.
Faculty Publications
  • Mark Brenner
  • Joseph M. Smoak
  • Douglas A. Leeper
  • Matt Streubert
  • Shirley M. Baker
SelectedWorks Author Profiles:

Joseph M. Smoak

Document Type
Article
Publication Date
2007
Date Issued
January 2007
Date Available
January 2012
Abstract

Selected lakes in Hillsborough County, Florida have been hydrologically augmented with groundwater to offset stage declines caused by excessive pumping of the Floridan Aquifer. Augmentation water can be relatively rich in 226Ra (>5 decays per minute [dpm] L-1). We measured 226Ra activities in shells and soft tissues of adult bivalve molluscs (Elliptio cf. buckleyi) from groundwater-augmented and nonaugmented lakes to assess bioaccumulation of 226Ra by mussels. Mussels from augmented lakes displayed higher 226Ra in both shells and tissues than did mussels from nonaugmented lakes. Within a sample, 226Ra activity in Elliptio tissues was higher than the value measured in shells. Highest activities were found in a composite mussel sample (n = 6) from an augmented lake; soft tissue activity was 619 ± 33 dpm g-1 dry weight and shell activity was 147 ± 7 dpm g-1 g dry weight. Large mussels displayed greater activities in soft tissues and shells than did small mussels. We transplanted animals from a nonaugmented lake into a groundwater-augmented water body. 226Ra activity in dry tissue rose from 32 ± 1 to 196 ± 2 dpm g-1 within 2 months. When 226Ra -rich mussels (232 ± 2 dpm g-1) from the augmented lake were transferred to the nonaugmented lake, they showed no significant 226Ra loss over the 69-d experiment. Large Elliptio mussels concentrated 226Ra in their soft tissues to levels about 1,000 to 25,000 times concentrations in lake water. Pumping of groundwater in Florida for residential, agricultural, and industrial use contributes dissolved 226Ra to some surface water bodies, where it can be bioaccumulated by bivalve molluscs.

Comments
Abstract only. Full-text article is available only through licensed access provided by the publisher. Published in Limnology and Oceanography, 52(4), 1614-1623. Members of the USF System may access the full-text of the article through the authenticated link provided.
Language
en_US
Publisher
American Society of Limnology and Oceanography
Creative Commons License
Creative Commons Attribution-Noncommercial-No Derivative Works 4.0
Citation Information
Brenner, M., Smoak, J.M., Leeper, D.A., Streubert, M. & Baker, S.M. (2007). Radium-226 accumulation in Florida freshwater mussels. Limnology and Oceanography, 52(4), 1614-1623.