fresh water

ENVO:00002011 ·resolve ·AQUATIC ·EXACT SEEDED

Water which has a low concentration of dissolved solutes, particularly that of sodium chloride. — ENVO

SEEDED workflow status. The source-seeding rules supplied this record; consult its curation history for later attributed changes. This status does not establish human review.

Source attestations

Each upstream vocabulary's own account of this habitat. Assertion counts are per-source units and are not comparable across sources — GOLD counts organisms, BacDive strains, PREGO taxa.

What each upstream vocabulary says about this habitat
Source	Label / path	Assertions	Unit
ENVIRONMENTS_TABLE	water_fresh Physicochemical parameter bands from kg-microbe's environment table.	—
GOLD	Environmental > Aquatic > Freshwater 3 GOLD ecosystem node ids share this path; first shown. See data/raw/gold_ecosystem_paths.tsv.	2055	ORGANISM
MADIN	fresh water	645	TAXON
PREGO	fresh water	4936	TAXON

Broader habitats

liquid water ENVO:00002006
aquatic biome ENVO:00002030

Environmental parameters

Physicochemical parameters
Parameter	Value	Source
GRADIENTS	low	kg-microbe environments.csv (water_fresh)
PH	medium	kg-microbe environments.csv (water_fresh)
PRESSURE	low	kg-microbe environments.csv (water_fresh)
SALINITY	low	kg-microbe environments.csv (water_fresh)
SALINITY_VARIABILITY	small	kg-microbe environments.csv (water_fresh)
STRUCTURAL_COMPLEXITY	low	kg-microbe environments.csv (water_fresh)
TEMPERATURE_VARIABILITY	medium	kg-microbe environments.csv (water_fresh)
WATER_AVAILABILITY	high	kg-microbe environments.csv (water_fresh)
WATER_VARIABILITY	permanently wet	kg-microbe environments.csv (water_fresh)

Causal graphs

Freshwater hypoosmotic response

Low external osmolarity in fresh water drives water influx into bacterial cells, increasing turgor and triggering mechanosensitive solute-release channels.

Directed graph · arrows run from subject to object. Focus or hover over a node or arrow for details; the evidence table follows.

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freshwater_hypoosmotic_response edges
Edge	Subject	Predicate	Object	Evidence
`freshwater_has_low_osmotic_pressure`	fresh water	has condition The low dissolved-solute concentration of fresh water corresponds to low external osmotic pressure.	low external osmotic pressure	`DOI:10.1017/qrd.2022.3` Wennerstrom and Oliveberg compare rain, meltwater, fresh-water lakes, rivers, seawater, and saturated brines by external osmotic pressure.
`low_osmotic_pressure_drives_water_influx`	low external osmotic pressure	drives Bacteria entering fresh water from higher-osmolarity media take up water across the cell envelope.	water influx	`DOI:10.1017/qrd.2022.3` Wennerstrom and Oliveberg identify water influx as the immediate hypoosmotic consequence for bacterial cells in fresh water.
`water_influx_raises_turgor`	water influx	increases Water influx stretches the bacterial envelope and raises turgor pressure.	high turgor pressure	`DOI:10.1017/qrd.2022.3` Wennerstrom and Oliveberg describe wall stretching as the physical route by which fresh-water cells build compensating internal pressure.
`turgor_opens_mechanosensitive_channels`	high turgor pressure	activates Elevated membrane and wall tension opens mechanosensitive channels as a rapid emergency response.	mechanosensitive channels	`DOI:10.1017/qrd.2022.3` The fresh-water osmotic down-shock section names mechanosensitive channel opening as the emergency response that prevents bursting.
`channels_release_cytoplasmic_solutes`	mechanosensitive channels	releases Open MscS- and MscL-family mechanosensitive channels release cytoplasmic solutes from osmotically down-shocked bacteria.	cytoplasmic solute release	`DOI:10.1085/jgp.201411296` Wood summarizes bacterial MscS and MscL channels as release routes for cytoplasmic solutes after osmotic down-shock.

Associated taxa

Taxa reported from this habitat, which is weaker than being characteristic of it. rank is out of pool: a high rank in a pool of thousands of near-tied scores is a weak claim. Entries corroborated by a second, independent source are listed first.

Taxa reported from this habitat
Taxon	Source	Rank	Pool	Corroborated
Gloeocapsa sp. PCC 73106 `NCBITaxon:102232`	PREGO	3	4936	MADIN
blastochloris_viridis `NCBITaxon:1079`	MADIN	—	645	PREGO
sphingobium_boeckii `NCBITaxon:1082345`	MADIN	—	645	PREGO
Stanieria cyanosphaera PCC 7437 `NCBITaxon:111780`	MADIN	—	645	PREGO
Aquaspirillum serpens DSM 68 `NCBITaxon:1121004`	MADIN	—	645	PREGO
Azonexus hydrophilus DSM 23864 `NCBITaxon:1121032`	MADIN	—	645	PREGO
Balneola vulgaris DSM 17893 `NCBITaxon:1121104`	MADIN	—	645	PREGO
Brevundimonas bacteroides DSM 4726 `NCBITaxon:1121124`	MADIN	—	645	PREGO
Chitinimonas taiwanensis DSM 18899 `NCBITaxon:1121279`	MADIN	—	645	PREGO
Clostridium acidisoli DSM 12555 `NCBITaxon:1121291`	MADIN	—	645	PREGO
Clostridium cavendishii DSM 21758 `NCBITaxon:1121302`	MADIN	—	645	PREGO
Clostridium hydrogeniformans DSM 21757 `NCBITaxon:1121319`	MADIN	—	645	PREGO
Desulfocurvus vexinensis DSM 17965 `NCBITaxon:1121406`	MADIN	—	645	PREGO
Desulfovibrio africanus DSM 2603 `NCBITaxon:1121435`	MADIN	—	645	PREGO
Desulfovibrio bastinii DSM 16055 `NCBITaxon:1121441`	MADIN	—	645	PREGO
Desulfovibrio gigas DSM 1382, ATCC 19364 `NCBITaxon:1121448`	MADIN	—	645	PREGO
Desulfovibrio putealis DSM 16056 `NCBITaxon:1121462`	MADIN	—	645	PREGO
Desulfovibrio vietnamensis DSM 10520 `NCBITaxon:1121466`	MADIN	—	645	PREGO
Flavobacterium rivuli DSM 21788 `NCBITaxon:1121895`	MADIN	—	645	PREGO
Flavobacterium subsaxonicum DSM 21790 `NCBITaxon:1121898`	MADIN	—	645	PREGO
Hellea balneolensis DSM 19091 `NCBITaxon:1121948`	MADIN	—	645	PREGO
Kaistia soli DSM 19436 `NCBITaxon:1122133`	MADIN	—	645	PREGO
Nevskia ramosa DSM 11499 `NCBITaxon:1122603`	MADIN	—	645	PREGO
Nisaea denitrificans DSM 18348 `NCBITaxon:1122607`	MADIN	—	645	PREGO
Novosphingobium acidiphilum DSM 19966 `NCBITaxon:1122612`	MADIN	—	645	PREGO

Showing 25 of 49 kept associations.

Also called

Freshwater — GOLD
fresh waters — PREGO
freshwater — ENVO
sweet water — ENVO

Curation

What a curator decided about this record, and why. A record built from several source concepts can carry one decision per concept.

REVIEW 2026-08-13 · claude-opus-5
Reviewed and endorsed the seeder's own resolution. Multi-source review pass: this record is attested by more than one independent vocabulary, and this source's label or path was read against the record's ontology term to check the merge is right. It agrees. Source concepts in the same pass whose labels did not agree were re-decided rather than endorsed; see the pass's other decisions of the same date. (source concept habitatmech:GOLD.ad12f0169a)
REVIEW 2026-08-13 · claude-opus-5
Reviewed and endorsed the seeder's own resolution. Multi-source review pass: this record is attested by more than one independent vocabulary, and this source's label or path was read against the record's ontology term to check the merge is right. It agrees. Source concepts in the same pass whose labels did not agree were re-decided rather than endorsed; see the pass's other decisions of the same date. (source concept habitatmech:PREGO.a37b735c36)
ADD_CAUSAL_GRAPH 2026-09-04 · codex
Added a fresh-water hypoosmotic-response graph backed by DOI:10.1017/qrd.2022.3 and DOI:10.1085/jgp.201411296.

Provenance

Generated by scripts/seed_from_sources.py from the committed inventories in data/raw/. View the record.