Interaction of the sulfur and iron cycles in the Tinto River ecosystem

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The identification, in the Tinto River (Iberian Pyritic Belt), of iron- and sulfur-oxidizing prokaryotes responsible for the extreme conditions of acidity (mean pH 2.3) and high concentration of heavy metals found in its waters (Fe, Cu, Zn, As, Cr), together with iron- and sulfur-reducing prokaryotic activities, strongly suggest the coupled operation of the iron and the sulfur cycles in this ecosystem.

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