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The biology of a population of Gammarus laticoxalis living in a perennial, constant temperature spring in Lebanon was studied. Life cycle, sex-ratio, fecundity and body length were followed over three years. It seems that the biological rhythm of this Gammarus depends on rainfall, which is highest in winter in Lebanon, and on photoperiod. Some comparative data about G. syriacus is also given.

Les parties temporaire et permanente d'un cours d'eau du Liban central sont étudiées. Les données climatiques, hydrogéologiques, hydrographiques et biotiques du Nahr Qab Ilias mettent en relief la présence de trois zones étagées en fonction de l'altitude. Les Plécoptères dominent à l'amont et les Ephéméroptères à l'aval. Studies on Lebanese streams : the biological zonation of the Nahr Qab Illas. Intermittent and permanent parts of a chalky stream are studied. Climatical, hydrogeological, hydrographie and biological data are given. The stream is divided in three sectors. The Plecoptera are the main group of the zoocenosis in the upper part. The Ephemeroptera dominate in the lower part.

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