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The effect of Tubificidae of the genus Tubifex on the release of different forms of phosphorus (particulate, dissolved organic and orthophosphates) has been studied in the laboratory under controlled conditions. When the environment is oxygenated, the worms produce an increase in particulate phosphorus in the water column, but at the expense of orthophosphates so that the amount of total phosphorus is scarcely higher than that of a control. When the environment has a low oxygen content, the difference is more marked, chiefly due to the greater abundance of particulate phospho­ rus. This particulate phosphorus appears to arise from more essential stirring because defaecation is reduced by the oxy­ gen deficit. This transfer of orthophosphat es to particulate phosphates raises the problem of the biological availability of the latter that condition the positive or negative action of Tubifex on algal nutrition.

Etude expérimentale de l'influence de Tubifex tubifex Müll. (Tubificidae, Oligochaeta) sur le relargage du phosphore par le sédiment