Abstract

To study the biodiversity of halophilic bacteria in a protected wetland located in Loukkos (Northwest, Morocco), a total of 124 strains were recovered from sediment samples from a marsh and salterns.  120 isolates (98%) were found to be moderately halophilic bacteria; growing in salt ranges of 0.5 to 20%.   Of 124 isolates, 102 were Gram-positive while 22 were Gram- negative. All isolates were identified based on 16S rRNA gene phylogenetic analysis and characterized phenotypically and by screening for extracellular hydrolytic enzymes. The Gram-positive isolates were dominated by the genus Bacillus(89%) and the others were assigned to Jeotgalibacillus, Planococcus, Staphylococcusand Thalassobacillus. The Gram- negative isolates were dominated by the genus Vibrio(41%) and the others were assigned to Halomonas, Psychrobacter, Marinobacterium,Pseudoalteromonas, Salinivibrio and Photobacterium. The growth of strains obtained under different physico-chemical conditions and the screening for hydrolytic enzymes showed a high diversity even within the same species.

Key words: Halophilic bacteria; , Lower Loukkos; , sediment; , biodiversity; , 16S rRNA gene sequencing; , hydrolytic enzymes.