Phosphorus bioavailability of fluvial sediments determined by algal assays |
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Authors: | Bonnie K Ellis Jack A Stanford |
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Institution: | (1) Flathead Lake Biological Station, University of Montana, 59860 Polson, MT, USA |
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Abstract: | Eroding bank soils and riverine suspended sediments from the Flathead River-Lake ecosystem, Montana, USA, were cultured with
the alga Selenastrum capricornutum Printz in PAAP medium with the sediments as the sole source of phosphorus. Extraction of phosphorus by NaOH and nitrilotriacetic
acid (NTA) solutions were compared to results from algal bioassays. The fine sediment particles transported into Flathead
Lake during spring runoff had the highest availability (i.e. 6% of total phosphorus). Bank soils which contained the greatest
percentage of fine clays exhibited similar (i.e. 4% of total phosphorus) availability. Bank soils containing predominantly
organic phosphorus had the lowest availability. Spearman's rank correlation indicated significance at the 5% test level between
algal assay estimates of available phosphorus and both chemical extraction techniques. |
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Keywords: | bioassay phosphorus sediments bioavailability |
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