Issue |
Annls Limnol.
Volume 11, Number 1, 1975
|
|
---|---|---|
Page(s) | 101 - 106 | |
DOI | https://doi.org/10.1051/limn/1975001 | |
Published online | 16 June 2011 |
Influence des variations d'oxygène dissous sur les invertébrés benthiques d'un ruisseau des Pyrénées centrales
Effect of variations in dissolved oxygen on the benthic invertebrates of a stream in the central Pyrenees
Laboratoire d'Hydrobiologie, Université Paul-Sabatier, 118, route de Narbonne, 31077 Toulouse Cedex
Des expériences de désoxygénation partielle de l'eau d'un ruisseau montrent qu'il existe un seuil de concentration en O2 dissous (ici proche de 4 ppm) au-dessous duquel la dérive des invertébrés benthiques s'accroît de façon significative. L'importance de cette dérive est alors variable selon les espèces considérées, l'intensité et la durée de la désoxygénation. Les variations quotidiennes des teneurs en O2 dissous que présentent naturellement les eaux courantes, ne paraissent entraîner aucune réaction de la faune si elles se situent au-dessus de ce seuil.
Abstract
Some experiments with the partial deoxygenation of the water of a stream showed that there is a threshold for dissolved oxygen (close to 4 ppm) below which the drift of benthic invertebrates signifîcantly increases. The magnitude of the drift varies between species, and with both the intensity and duration of the deoxygenation. The daily variations in dissolved oxygen content occurring naturally in running water do not appear to affect the fauna if the oxygen content is higher than the threshold given above.
© Masson, 1975
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