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| Format: | Dataset Open Access |
| Language: | en |
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PANGAEA
2010
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| Online Access: | https://doi.org/10.1594/PANGAEA.746020 |
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| _version_ | 1867169033016573952 |
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| author | Goldhammer, Tobias Brüchert, Volker Ferdelman, Timothy G Zabel, Matthias |
| author_facet | Goldhammer, Tobias Brüchert, Volker Ferdelman, Timothy G Zabel, Matthias |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Phosphorus is an essential nutrient for life. In the ocean, phosphorus burial regulates marine primary production**1, 2. Phosphorus is removed from the ocean by sedimentation of organic matter, and the subsequent conversion of organic phosphorus to phosphate minerals such as apatite, and ultimately phosphorite deposits**3, 4. Bacteria are thought to mediate these processes**5, but the mechanism of sequestration has remained unclear. Here, we present results from laboratory incubations in which we labelled organic-rich sediments from the Benguela upwelling system, Namibia, with a 33P-radiotracer, and tracked the fate of the phosphorus. We show that under both anoxic and oxic conditions, large sulphide-oxidizing bacteria accumulate 33P in their cells, and catalyse the nearly instantaneous conversion of phosphate to apatite. Apatite formation was greatest under anoxic conditions. Nutrient analyses of Namibian upwelling waters and sediments suggest that the rate of phosphate-to-apatite conversion beneath anoxic bottom waters exceeds the rate of phosphorus release during organic matter mineralization in the upper sediment layers. We suggest that bacterial apatite formation is a significant phosphorus sink under anoxic bottom-water conditions. Expanding oxygen minimum zones are projected in simulations of future climate change**6, potentially increasing sequestration of marine phosphate, and restricting marine productivity. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_746020 |
| institution | PANGAEA |
| language | en |
| publishDate | 2010 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Figure 1 and 2) Phosphorus pools in the investigated sediments quantified by SEDEX sequential extraction and distribution of recovered 33P spike between sedimentary P pools after incubation Goldhammer, Tobias Brüchert, Volker Ferdelman, Timothy G Zabel, Matthias Center for Marine Environmental Sciences; Comment; DEPTH, sediment/rock; Elevation of event; Event label; Latitude of event; Liquid scintillation; Longitude of event; M76/2; M76/2_223; M76/2_231; MARUM; Meteor (1986); MUC; MultiCorer; Namibia upwelling, Southeast Atlantic; Phosphorus, inorganic; Phosphorus, inorganic, activity; Sequential leaching technique Phosphorus is an essential nutrient for life. In the ocean, phosphorus burial regulates marine primary production**1, 2. Phosphorus is removed from the ocean by sedimentation of organic matter, and the subsequent conversion of organic phosphorus to phosphate minerals such as apatite, and ultimately phosphorite deposits**3, 4. Bacteria are thought to mediate these processes**5, but the mechanism of sequestration has remained unclear. Here, we present results from laboratory incubations in which we labelled organic-rich sediments from the Benguela upwelling system, Namibia, with a 33P-radiotracer, and tracked the fate of the phosphorus. We show that under both anoxic and oxic conditions, large sulphide-oxidizing bacteria accumulate 33P in their cells, and catalyse the nearly instantaneous conversion of phosphate to apatite. Apatite formation was greatest under anoxic conditions. Nutrient analyses of Namibian upwelling waters and sediments suggest that the rate of phosphate-to-apatite conversion beneath anoxic bottom waters exceeds the rate of phosphorus release during organic matter mineralization in the upper sediment layers. We suggest that bacterial apatite formation is a significant phosphorus sink under anoxic bottom-water conditions. Expanding oxygen minimum zones are projected in simulations of future climate change**6, potentially increasing sequestration of marine phosphate, and restricting marine productivity. |
| title | (Figure 1 and 2) Phosphorus pools in the investigated sediments quantified by SEDEX sequential extraction and distribution of recovered 33P spike between sedimentary P pools after incubation |
| topic | Center for Marine Environmental Sciences; Comment; DEPTH, sediment/rock; Elevation of event; Event label; Latitude of event; Liquid scintillation; Longitude of event; M76/2; M76/2_223; M76/2_231; MARUM; Meteor (1986); MUC; MultiCorer; Namibia upwelling, Southeast Atlantic; Phosphorus, inorganic; Phosphorus, inorganic, activity; Sequential leaching technique |
| url | https://doi.org/10.1594/PANGAEA.746020 |