Issue |
Ann. Limnol. - Int. J. Lim.
Volume 27, Number 3, 1991
|
|
---|---|---|
Page(s) | 253 - 265 | |
DOI | https://doi.org/10.1051/limn/1991019 | |
Published online | 15 August 2009 |
Etude expérimentale de l'influence de Tubifex tubifex Müll. (Tubificidae, Oligochaeta) sur le relargage du phosphore par le sédiment
A laboratory study of the effect of Tubifex tubifex MülI. (Tubificidae, Oligochaeta) on the release of phosphorus through the sediment
Laboratoire d'Hydrobiologie, U.R.A. 695 C.N.R.S., Université
Paul Sabatier, 118, route de Narbonne, 31062 Toulouse
Cedex, France
L'influence de Tubificidae du genre Tubifex sur le relargage des différentes formes du phosphore (particulaire, organique dissous et orthophosphates) a été étudiée au laboratoire, en conditions contrôlées. Lorsque le milieu est oxygéné, les vers entraînent une augmentation du phosphore particulaire dans la colonne d'eau mais aux dépens des orthophosphates, de sorte que le relargage de phosphore total n'est guère supérieur à celui du témoin. En milieu appauvri en oxygène, la différence est plus nette mais elle est surtout due au phosphore particulaire plus abondant. Ce phosphore particulaire semble provenir d'une agitation plus importante car la défécation est réduite par le déficit en oxygène. Le transfert apparent orthophosphates-phosphore particulaire pose le problème de la biodisponibilité de ce dernier qui conditionne l'action positive ou négative des Tubifex sur la nutrition algale.
Abstract
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 ortho-phosphates 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 phosphorus. This particulate phosphorus appears to arise from more essential stirring because defaecation is reduced by the oxygen deficit. This transfer of orthophosphates 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.
Mots clés : tubifex / sédiment / phosphore / relargage
Key words: tubifex / sediment / phosphorus / release
© Gauthier-Villars, 1991
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