What does stenohaline mean?
Stenohaline describes an organism or environment that can tolerate only a narrow range of salt concentrations. The word is especially important in marine biology and oceanography, where salinity can determine which species are able to survive in a particular habitat. A stenohaline organism may be adapted to a remarkably stable saline environment and may fail to survive if conditions change even slightly. This contrasts with euryhaline, which refers to organisms able to withstand a wide range of salinities. The term is also used for waters with limited salinity variation, although it is most commonly applied to species and their physiological tolerances. Its usefulness lies in describing a specialized ecological adaptation that is easy to overlook when considering the dramatic differences between marine environments.
Denoting an organism or environment that tolerates only a narrow range of salt concentrations.
"The stenohaline shellfish survives in a restricted zone where the water salinity changes very little."
Common in marine biology, freshwater biology, and oceanography.
An organism that can tolerate only a narrow range of salt concentrations.
"The stonefish is a stenohaline and is therefore sensitive to salinity changes in its habitat."
The noun form is less common than the adjective and is chiefly used in technical biological writing.
Used for multiple organisms characterized by narrow salinity tolerance.
"Several stenohalines were recorded in the stable saline waters of the deep basin."
Some ocean creatures are so specialized for their salt levels that a small change in salinity can be fatal.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does stenohaline come from?
Stenohaline combines the combining form steno-, from Greek stenos meaning narrow, with haline, from Greek hals meaning salt or sea. The related terms euryhaline and hyperhaline use the same Greek elements in combinations expressing wide salinity tolerance and excessive salinity respectively. The word entered scientific usage as a specialized term in the study of organisms' relationships to salt concentrations.
Related word forms
How stenohaline is actually used
Most often used in marine and freshwater biology, ecology, and oceanography. It is a technical term and is normally used with organisms, species, or habitats rather than in general conversation.
Easily confused with stenohaline
A stenohaline organism tolerates only a narrow range of salinity, whereas a euryhaline organism can withstand a wide range.