At a glance
Essentials
- Distribution
- Documented records include salt flats in Tunisia (Sfax), salted foods, and animal skins. A complete global distribution is not established in the provided sources.
- Habitat
- Hypersaline environments: salt lakes, solar salt flats, salt flat sediments, animal skins, and salted foods (such as cod, sausages, and bacon).
- Activity
- Uses bacteriorhodopsin to generate energy under low oxygen conditions; produces gas vesicles to float towards the surface.
- Diet
- Obtains energy mainly from the degradation of amino acids, such as arginine and aspartate. It does not catabolize glucose directly, but performs gluconeogenesis.
Observation guide
What to look for
- 01
Cells of bacillary (rod) or spherical shape, of microscopic size.
- 02
Colonies of pink or reddish color due to the production of carotenoids, such as bacterioruberin.
- 03
Violet fluorescence under ultraviolet light.
Lighting, age and viewing angle can hide features. If identification affects consumption, handling or conservation, consult specialist sources.
Ecology
Description and characteristics
Halobacterium salinarum is an archaeal microorganism of the domain Archaea, belonging to the class Halobacteria. Despite its name, it is not a bacterium. It is characterized as an extremely halophilic and obligate aerobic organism, capable of growing in very high salt concentrations, up to saturation.
Its morphology is of single bacillary-shaped cells (rod), although spherical shapes have also been observed. The cell membrane consists of a lipid bilayer surrounded by an S-layer. To adapt to the osmotic stress of its environment, it accumulates potassium ions through active transport and possesses predominantly acidic proteins that prevent their precipitation in concentrated saline solutions.
Under conditions of low oxygen availability, as occurs in densely populated salt flats, H. salinarum can use light energy through bacteriorhodopsin, a membrane protein that acts as a light-driven proton pump, allowing ATP synthesis. Additionally, it produces carotenoids, mainly bacterioruberin, which give it a pink or reddish color and act as protectors against ultraviolet radiation damage.