The diether core membrane lipid sesterterpanyl-phytanyl-glycerol (so-called extended archaeol and often abbreviated C20-C25) is considered as a hallmark of Haloarchaea, clade archaea thriving under extreme high salinities. We here report about occurrence in different saline aquatic settings with salinity ranging from ca. 50 psu (5 % NaCl w/v) to saturation (ca. 350 psu). This demonstrates that ...

European sea bass (Dicentrarchus labrax), a major aquaculture species, is distributed along the coasts of North-Eastern Atlantic Ocean, Mediterranean and Black Sea. D. labrax enter lagoons estuaries where salinity fluctuates sometimes reaches levels over 60‰, notably in lagoons. Keeping mind that are genetically subdivided an lineage, we compared fish from (A) West (M) populations regarding the...

Changes in pigment content allow seagrasses to photo-acclimate to dynamic light environments, but lightand salinity-induced stress may reduce this ability. In this study, Thalassia testudinum seedlings were exposed to two light treatments (50 – 70% reduction and full sun) and three salinity treatments (20, 35, and 50) in a 44-day mesocosm experiment. Variation in leaf pigment content (chlorophy...

The genome of the halophilic archaeon Halobacterium sp. NRC-1 and predicted proteome have been analyzed by computational methods and reveal characteristics relevant to life in an extreme environment distinguished by hypersalinity and high solar radiation: (1) The proteome is highly acidic, with a median pI of 4.9 and mostly lacking basic proteins. This characteristic correlates with high surfac...

Carbonic anhydrase (CA) is a ubiquitous enzyme involved in acid-base regulation and osmoregulation. Many studies have demonstrated a role for this enzyme in fish osmoregulation in seawater as well as freshwater. However, to date CA responses of marine fish exposed to salinities exceeding seawater (approximately 35 ppt) have not been examined. Consequently, the aim of the present study was to ex...

Currently, several desalination facilities have been proposed to operate or are actually operating in California. These facilities' use of reverse osmosis (RO) may discharge hypersaline reject brine into the marine environment. The risks, if any, this brine would pose to coastal receiving waters are unknown. To test the toxicity of hypersaline brine in the absence of any additional toxic consti...