Factors influencing the spatio-temporal distribution of benthic Microcystis aeruginosa colonies (Cyanobacteria) in the hypertrophic Grangent Reservoir (Loire, France).
The spatio-temporal distribution of benthic colonies of Microcystis aeruginosa in Grangent Reservoir (France) in 2000 was not homogeneous and appeared to be controlled by many external factors: lake depth, station morphometry, substratum and hydraulic regime (lacustrine or fluvial). A most important concentration of benthic colonies was found at deep sites with fine sediment or at sites where the sediment was rich in organic matter. In spite of a stable water level and a minimum flow during summer, the number of benthic colonies showed great variation in the lacustrine downstream part of the reservoir. These variations may be explained by the dynamics of planktonic cyanobacteria.
Latour
Delphine
D
Laboratoire de biologie animale et appliquée, faculté des sciences et techniques, université Jean-Monnet, 23, rue du Docteur-Paul-Michelon, 42023 Saint-Etienne cedex 2, France. delphine.latour@univ-st-etienne.fr
Giraudet
Hervé
H
D000458:Cyanobacteria / Q000302:isolation & purification / Q000502:physiology*; D017753:Ecosystem; D005602:France; D005618:Fresh Water / Q000382:microbiology*; D019015:Geologic Sediments / Q000382:microbiology; D012621:Seasons; D013696:Temperature; D014871:Water Microbiology