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It is recommended to use a combination of sediment terms to describe a more specific sediment type.

The threshold salt concentration for classifying water as saline varies, but typically begins at about 1,000 to 3,000 parts salt per million parts water or 0.1–0.3% salt by weight.

The lower bound of solute concentration required for water to be considered freshwater is variable, but is always less than that of seawater, and often cited as less than 1 gram of solutes per 1 litre of water.

Everything under this parent must be a mass noun. All subclasses are to be understood as being composed primarily of the named entity, rather than restricted to that entity. For example, "ENVO:water" is to be understood as "environmental material composed primarly of some CHEBI:water". This class is currently being aligned to the Basic Formal Ontology. Following this alignment, its definition and the definitions of its subclasses will be revised.

In ENVO's alignment with the Basic Formal Ontology, this class is being considered as a subclass of a proposed BFO class "system". The relation "environed_by" is also under development. Roughly, a system which includes a material entity (at least partially) within its site and causally influences that entity may be considered to environ it. Following the completion of this alignment, this class' definition and the definitions of its subclasses will be revised.

Formerly, this class was an experimental class and a subclass of "environmental feature". It is now aligned to BFO. The class was not obsoleted as the core semantics maintained their stability through its transition.

This is a defined class: most of its subclasses will not be asserted, but filled by inference.

Organisational class. Not intended for annotation.

This class (term) is defined by the lack of a quality (i.e. the lack of salinity or increased osmolarity), which is not best-practice ontologically. Use for annotation is generally discouraged and users should use classes which positively describe the material or environment sampled (i.e. stating the qualities the entity has, rather than those it does not).

We do not specify numeric thresholds for saline vs. non-saline here, as this is variable. Consider specifying this on the information and/or data layer for your purposes. If you require an ENVO class with a fixed threshold, please request one using our issue tracker.

We do not specify numeric thresholds for saline vs. non-saline here, as this is variable. Consider specifying this on the information and/or data layer for your purposes. If you require an ENVO class with a fixed threshold, please request one using our issue tracker.

The thresholds for "significant" concentrations of salts vary widely and thus no committment is made in this class. Subclasses with more explicit thresholds can be made upon request.

This term can be understood as a negative experimental control primarily composed of sterile water. The quantity of sterile water used may be contaminated; to express pure sterile water, please use http://purl.obolibrary.org/obo/ENVO_00005791

Mock communities are typically used as positive controls in experiments.