Microcystis farlowiana est une Cyanobactérie coloniale découverte au Massachussets en 1942, et dans les marais Sud du lac du Bourget en 1949. Actuellement on la trouve dans ce lac à des profondeurs comprises entre 2 et 30 mètres.Les colonies formant des « boules » de 0,5 à 2 centimètres de diamètre, sont regroupées en amas lenticulaires de grande taille qui reposent sur le fond du lac et semblent subir un déplacement saisonnier peut-être dû aux courants sous-lacustres.Depuis sa première description on a constaté des variations dans la couleur et la taille des colonies qui -d'abord flottantes puis subbenthiques -sont actuellement épibenthiques et localisées dans des régions défavorables à la photosynthèse. Some aspects of implantation of a colonial Cyanobacteria Microcystis farlowiana Drouet & Daily in Lake BourgetKeywords : Microcystis farlowiana, cyanobacteria, Lake Bourget, phytobenthos, distribution.Microcystis farlowiana is a colonial Cyanobacteria found in Massachussetts in 1942, also in the southern swamps of the Lake Bourget in 1949. Presently, it can be found in this lake at depths between 2 and 30 meters.Colonies, forming little balls whose diameter in between 0.5 and 2 centimeters, are gathered to form large lenticulare masses lying on the bottom of the lake. They seem to undergo seasonal movings which could be due to currents in the lake bottom.Since they were first described, colonies showed variations of colour and size : they were first floating, then subbenthic ; now, they are epibenthic, and localized in photosynthesis unfavourable regions.
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