Abstract
An early summer collection of Apodemus sylvaticus and Microtus agrestis was made from the vicinity of a recolonised fluorspar tailings dam. Tissue fluoride concentrations in both species followed the order femur ⪢ kidney > liver > muscle and were clearly related to fluoride levels in soil and vegetation. Fluoride analysis of stomach contents and faecal pellets in Apodemus gave a good indication of the fluoride status of the environment. Tissue fluoride levels were generally higher in Apodemus than in Microtus and, in the most polluted area, femur fluoride concentrations up to 7000 μg/g were found. Specimens of Apodemus trapped in October gave very much lower femur fluoride concentrations than specimens from the earlier collection although it was felt that these were probably young individuals belonging to the succeeding generation and as such would have had comparatively little time to accumulate fluoride from the environment.
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