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Science 21 January 2005:
Vol. 307. no. 5708, pp. 416 - 418
DOI: 10.1126/science.1103096
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Reports

Large Sulfur Bacteria and the Formation of Phosphorite

Heide N. Schulz1* and Horst D. Schulz2

Phosphorite deposits in marine sediments are a long-term sink for an essential nutrient, phosphorus. Here we show that apatite abundance in sediments on the Namibian shelf correlates with the abundance and activity of the giant sulfur bacterium Thiomargarita namibiensis, which suggests that sulfur bacteria drive phosphogenesis. Sediments populated by Thiomargarita showed sharp peaks of pore water phosphate (≤300 micromolar) and massive phosphorite accumulations (≥50 grams of phosphorus per kilogram). Laboratory experiments revealed that under anoxic conditions, Thiomargarita released enough phosphate to account for the precipitation of hydroxyapatite observed in the environment.

1 Institute for Microbiology, University of Hannover, Schneiderberg 50, D-30167 Hannover, Germany.
2 Department of Geosciences, University of Bremen, Klagenfurter Strasse, D-28359 Bremen, Germany.

* To whom correspondence should be addressed. E-mail: schulz{at}ifmb.uni-hannover.de

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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