Dissolved iron stimulates uptake of organic phosphorus by <i>Didymosphenia geminata</i>
Abstract
Recent blooms of Didymosphenia geminata in streams around the world where they had never been recorded before has generated new interest in the biology and ecology of this diatom. The species is often found in oligotrophic mountain streams where phosphorus limitation may determine productivity. Excessive stalk production that results in blooms may be a response to low phosphorus conditions. The available form of phosphorus and the concentration of iron were manipulated to determine whether these factors affect phosphorus uptake rate. Phosphorus form, iron concentration, and initial phosphorus concentration all had significant effects on uptake rate. The results of this experiment show that organic phosphorus may be an important source of phosphorus for D. geminata, and that high concentrations of iron may influence the phosphorus uptake mechanism. Therefore, stream chemistry is likely to play an important role in determining bloom formation by D. geminata.
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References (16)
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