Summary
Snails (Helix aspersa) contain sulphate-reducing bacteria in their crops. Feeding such animals on food containing sulphate and molybdate ions does not induce a copper deficiency and in fact the bacteria appear to facilitate metal absorption. This is in contrast to the effects of these bacteria in ruminant cattle.
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Simkiss, K. Prokaryote-eukaryote interactions in trace element metabolism. Desulfovibrio sp. in Helix aspersa. Experientia 41, 1195–1197 (1985). https://doi.org/10.1007/BF01951726
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DOI: https://doi.org/10.1007/BF01951726