Issue |
Annls Limnol.
Volume 15, Number 3, 1979
|
|
---|---|---|
Page(s) | 275 - 290 | |
DOI | https://doi.org/10.1051/limn/1979013 | |
Published online | 15 June 2011 |
Quelques aspects de l'écologie du plancton d'un lac de montagne eutrophe : le lac de Petichet (Isère)
Several aspects of the ecology of plankton in a eutrophic mountain lake: Lake Petichet (Isère)
Laboratoire de Zoologie, Domaine Universitaire, B. P. 53, 38031 Grenoble
L'auteur étudie l'évolution saisonnière et la répartition verticale du phytoplancton et du zooplancton d'un lac de moyenne montagne et précise l'écologie des espèces principales. La présence d'organismes dominants à caractère β-mésosaprobe tels que Fragilaria crotonensis, Asterionella formosa, Melosira italica, Daphnia longispina et Cyclops vicinus, et la formation de "fleurs d'eau" à Dinobryon divergens et Oscillatoria ? cortiana soulignent les résultats des analyses physico-chimiques de l'eau qui avaient mis en évidence le caractère eutrophe du lac.
Abstract
The author studied the seasonal evolution and vertical distribution of phytoplankton and zooplankton in a mountain lake at mean altitude, and described the ecology of the principal species. The presence of dominant specics from the β-mesosaprobic group, such as Fragilaria crotonensis, Asterionella formosa, Melosira italica, Daphnia longispina and Cyclops vicinus, and the formation of "water blooms" of Dinobryon divergens and Oscillatoria ? cortiana supports the concusions from physical and chemical analyses of the water that the lake is eutrophic.
© Masson, 1979
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