Annals of Microbiology

, Volume 68, Issue 12, pp 915–929 | Cite as

Analysis of the diversity of aerobic, thermophilic endospore-forming bacteria in two Algerian hot springs using cultural and non-cultural methods

  • Mohamed Amine GomriEmail author
  • Tedj El Moulouk Khaldi
  • Karima Kharroub
Original Article


Terrestrial hot environments are important resources for isolation of thermophilic microorganisms. Few studies have been made on microbial diversity of Algerian geothermal sites. This paper reports the diversity of thermophilic, aerobic endospore-forming bacteria from water and sediment samples taken from Hammam Ouled Ali and Hammam Debagh, two hot springs with a wide range of temperatures and a very rich mineral composition, located in the region of Guelma, north-east of Algeria using culture-dependent and culture-independent approaches Sequences of the V4 region of the 16S rRNA gene from environmental DNA extracted from sediment samples were analyzed and a set of isolates from water and sediment have been characterized by phenotypic and molecular methods. Phylogenetic surveys using environmental DNA sequences indicated that three families dominated the two hot springs: Planococcaceae, Bacillaceae, and Paenibacillaceae. Phenotypic characterization revealed the morphological, biochemical, and physiological properties of these microorganisms, all of which exhibited a range of common extracellular enzymatic activities. Amplified ribosomal DNA restriction analysis (ARDRA) was used to cluster isolates into different phylotypic groups and phylogenetic analysis of 16S rRNA gene sequences of selected isolates showed that all were closely related to four genera of thermophilic Bacilli: Bacillus, Anoxybacillus, Geobacillus, and Brevibacillus. Our results provide important insights into the microbial ecology of Guelma hot springs. They showed that the phylogenetic diversity of bacterial communities within the two studied hot springs was mostly aerobic, with the presence of taxonomic groups of great biotechnological interest. Bioprospection of thermozymes and other biomolecules within these communities will probably provide a data basis for their industrial exploitation.


Thermophilic Bacilli Endospore-forming Microbial diversity Hot spring Algeria 



Don Cowan and Thulani Makhalanyane, Centre for Microbial Ecology and Genomics, University of Pretoria, are gratefully acknowledged for their support in phylogenetics training. We also wish to thank Djamel Eddine Mekhancha, Laboratoire ALNUTS, Université Frères Mentouri Constantine 1 for his support during sampling, isolation, and phenotypic study.


This study received financial support from the following organizations: The Algerian Ministry of Higher Education and Scientific Research and The Genomics Research Institute and the University of Pretoria, South Africa.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Research involving human participants and/or animals

This article does not contain any studies with human participants or animals performed by any of the authors.

Informed consent


Supplementary material

13213_2018_1401_MOESM1_ESM.docx (58 kb)
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Authors and Affiliations

  1. 1.Equipe Métabolites des Extrêmophiles (METEX), Laboratoire de Recherche Biotechnologie et Qualité des Aliments (BIOQUAL), Institut de la Nutrition, de l’Alimentation et des Technologies Agro Alimentaires (INATAA)Université Frères Mentouri Constantine 1 (UFMC1)ConstantineAlgeria
  2. 2.Laboratoire Alimentation, Nutrition et Santé (ALNUTS), Institut de la Nutrition, de l’Alimentation et des Technologies Agro Alimentaires (INATAA)Université Frères Mentouri Constantine 1 (UFMC1)ConstantineAlgeria

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