| GENETIC AND CONCHOLOGICAL COMPARISON OF SNAILS (HELIX ASPERSA) DIFFERING IN SHELL DEPOSITION OF LEAD (1996) | |||||||||||||
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| Populations of snails inhabiting areas with different histories of Pb contamination differed in their deposition of Pb in shell relative to soft tissues. Genetic variation, measured using isozymes, was not related to Pb history nor geographic distance between populations. Shell characteristics were significantly different among sites; shell dry weight was strongly related to soil calcium levels. Shells of snails from areas with long histories of Pb contamination were significantly more robust (greater shell width/shell height ratio) than snails from other locations. H. asprsa adaptation to Pb contamination may involve significant changes in shell characteristics but these do not correlate with genetic traits assessed with allozymes | |||||||||||||
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