Non-cholera Vibrios
Vibrio spp. (non-cholerae)
Non-cholera vibrios include various species of the genus Vibrio, excluding the classic cholera pathogens (V. cholerae O1/O139). They are halophilic (salt-loving) and occur worldwide in coastal waters, estuaries, and brackish water zones. When water temperatures exceed 20°C, they proliferate rapidly and can cause wound infections, sepsis, or gastroenteritis in humans. Ecologically, they play a central role in the decomposition of organic matter, particularly chitin.
Details
Identification
Gram-negative rods, often slightly curved (comma-shaped), monotrichous flagellation (highly motile), growth on TCBS agar (Thiosulfate-Citrate-Bile-Sucrose).
Social behavior
Formation of biofilms on biotic and abiotic surfaces as well as quorum sensing to communicate population density.
Diet
Chemoorganotrophic; they utilize dissolved organic matter, algal exudates, and degrade complex polymers such as chitin.
Overwintering
Entry into a metabolically inactive but viable state (VBNC - viable but non-culturable) at low temperatures.
Ecology
Ecological role
Important decomposers in the marine ecosystem; they are primarily responsible for chitin degradation and serve as food for nanoflagellates.
Natural predators
Bacteriophage viruses, heterotrophic nanoflagellates, and filtering organisms such as bivalves.
Competitor species
Other marine bacteria such as Pseudomonas or Flavobacterium species.
Ecosystem service
Nutrient recycling (carbon and nitrogen cycles) in marine environments.
Threats
Not threatened; benefiting from anthropogenic ocean warming.
Scientific profile
Profile
Habitat
Worldwide in marine, estuarine, and coastal waters. They prefer warm temperatures (> 18-20 °C) and moderate salinities (brackish water, 0.5% to 2.5% NaCl). Often attached to particles or plankton.
Ecological role
Important decomposers in the marine ecosystem; they play a central role in carbon and nitrogen cycling. They are known for their ability to degrade complex organic material such as chitin.