Mucus secretion by the freshwater snail Lymnaea stagnalis limits aluminum concentrations of the aqueous environment
- St. Thomas Hospital, London (United Kingdom)
- Univ. of Manchester (United Kingdom). School of Biological Sciences
Extracellular mucopolysaccharide (EPS) is a significant component in many waters. Its role in the cycling and mobilization of metals is unclear. In vitro studies were conducted to examine the influence of EPS, secreted by the freshwater pond snail, Lymnaea stagnalis, on soluble water Al concentrations at near-neutral pH. Snails maintained in aerated water of known ion content and added aluminum reduced Al in solution as compared to controls. Although snails accumulated Al into soft tissue, this only accounted for a small percentage of the total reduction. The remaining Al was recovered following acidification of the water. This observation was attributed to pedal EPS secreted by L. stagnalis which is chiefly insoluble and substrate bound. The Al that remained in solution was more labile, possibly due to the influence of soluble EPS. Further experiments with isolated EPS, confirmed that this poorly soluble film binds and reduces Al in solution. The influence of EPS on the solution chemistry and bioavailability of Al and possibly other metals may be important in natural waters.
- OSTI ID:
- 655401
- Journal Information:
- Environmental Science and Technology, Vol. 32, Issue 17; Other Information: PBD: 1 Sep 1998
- Country of Publication:
- United States
- Language:
- English
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