liquid water

ENVO:00002006 ·resolve ·AQUATIC ·EXACT REVIEWED

An environmental material primarily composed of dihydrogen oxide in its liquid form. — ENVO

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 Physicochemical parameter bands from kg-microbe's environment table.	—
MADIN	liquid water	312	TAXON
PREGO	liquid water	2679	TAXON

Broader habitats

liquid environmental material ENVO:01000815

Environmental parameters

Physicochemical parameters
Parameter	Value	Source
GRADIENTS	low	kg-microbe environments.csv (water)
STRUCTURAL_COMPLEXITY	low	kg-microbe environments.csv (water)
WATER_AVAILABILITY	high	kg-microbe environments.csv (water)
WATER_VARIABILITY	permanently wet	kg-microbe environments.csv (water)

Causal graphs

Liquid water planktonic solute foraging

Bulk liquid water supplies high water activity, suspends free-living cells and organic particles, dissolves lower-molecular-weight organic substrates, and allows diffusion to form microscale nutrient patches. Extracellular enzymes hydrolyze polymers into dissolved organic matter, and motile chemotactic bacteria exploit those gradients to convert dissolved carbon into bacterial biomass within aquatic microbial loops.

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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liquid_water_planktonic_solute_foraging edges
Edge	Subject	Predicate	Object	Evidence
`liquid_water_provides_high_water_activity`	liquid water	provides Liquid water keeps water activity high relative to salt-saturated or desiccating habitats where low water activity limits microbial growth.	high water activity	`PMID:15306380` Grant reviewed water-activity limits and the microbial physiology required when water availability falls in saline or dry habitats. `PMID:25500507` Stevenson and colleagues tested bacterial, archaeal, and fungal growth near the low-water-activity limit for active life.
`high_water_activity_permits_aquatic_growth`	high water activity	permits High water availability permits hydrated free-living bacterial cells to maintain active metabolism in aqueous habitats.	free-living bacteria	`PMID:15306380` The review connects external water activity with cellular water stress, osmoadaptation, and whether microbes can grow. `PMID:21663439` Wood reviewed the homeostatic mechanisms bacteria use to maintain turgor and cytoplasmic hydration across external osmotic conditions.
`liquid_water_forms_bulk_aqueous_phase`	liquid water	forms Liquid-water habitats form a connected aqueous phase in which planktonic cells encounter dissolved and particulate substrates.	bulk aqueous phase	`DOI:10.3354/meps010257` Azam and colleagues treated liquid seawater as the bulk medium connecting bacteria, dissolved organic matter, and grazers.
`liquid_water_suspends_free_living_cells`	liquid water	suspends Bulk liquid water supports dispersed, planktonic free-living bacterial cells.	free-living bacteria	`DOI:10.3354/meps010257` Azam and colleagues synthesized bacterial biomass, production, and grazing in the marine water column.
`liquid_water_suspends_polymeric_particles`	liquid water	suspends Aquatic organic particles and high-molecular-weight compounds remain suspended in bulk water as substrates for extracellular enzymes.	polymeric organic matter	`PMID:21329211` Arnosti reviewed how marine extracellular enzymes hydrolyze complex organic matter outside microbial cells.
`polymeric_matter_requires_hydrolysis`	polymeric organic matter	requires Polymeric aquatic organic matter must be hydrolyzed outside the cell before microbes can take up the resulting smaller substrates.	extracellular hydrolysis	`PMID:21329211` Arnosti reviewed extracellular enzymatic hydrolysis as the step that makes macromolecular organic matter available to microbes.
`extracellular_hydrolysis_releases_dom`	extracellular hydrolysis	releases Extracellular hydrolysis converts polymeric particles into smaller dissolved organic molecules in surrounding liquid water.	dissolved organic matter	`PMID:21329211` The review links extracellular enzyme activity to transformations of marine dissolved and particulate organic matter.
`bulk_water_allows_solute_diffusion`	bulk aqueous phase	enables Dissolved substrates diffuse through the aqueous phase around particles, lysed cells, and other localized organic-matter sources.	solute diffusion	`PMID:23204367` Stocker and Seymour reviewed how aquatic nutrient sources generate dynamic dissolved plumes, patches, and gradients around bacteria.
`dom_forms_microscale_gradients`	dissolved organic matter	forms Dissolved organic substrates released from localized sources form transient microscale gradients in water.	microscale solute gradients	`PMID:23118182` Stocker described the microscale chemical heterogeneity encountered by planktonic microbes. `PMID:23204367` Stocker and Seymour synthesized the physical and ecological origins of aquatic microscale nutrient heterogeneity.
`gradients_select_chemotactic_motility`	microscale solute gradients	selects for Transient nutrient gradients reward motile bacteria that can bias swimming toward dissolved substrates.	chemotactic motility	`PMID:23204367` Stocker and Seymour reviewed chemotaxis as an adaptation to short-lived nutrient patches in aquatic habitats.
`chemotaxis_increases_dom_uptake`	chemotactic motility	increases Chemotactic motility helps bacteria remain in nutrient patches long enough to take up dissolved organic substrates.	heterotrophic dissolved-carbon uptake	`PMID:23204367` The review connects high-performance chemotaxis with rapid responses to aquatic chemical gradients.
`dom_supports_heterotrophic_bacteria`	dissolved organic matter	supports Dissolved organic matter supports heterotrophic bacterial growth in liquid-water microbial communities.	free-living bacteria	`DOI:10.3354/meps010257` Azam and colleagues framed dissolved organic matter uptake by water-column bacteria as a central aquatic carbon-flow process.
`uptake_generates_bacterial_biomass`	heterotrophic dissolved-carbon uptake	increases Heterotrophic uptake of dissolved carbon converts aquatic dissolved organic matter into bacterial biomass.	bacterial biomass	`DOI:10.3354/meps010257` The microbial-loop synthesis linked uptake of dissolved carbon to bacterial biomass and productivity in the water column.
`bacterial_biomass_feeds_microbial_loop`	bacterial biomass	contributes to Bacterial biomass produced from dissolved organic matter enters a microbial loop through heterotrophic flagellates and microzooplankton.	microbial loop	`DOI:10.3354/meps010257` Azam and colleagues introduced the water-column microbial-loop model linking bacteria, bacterivorous flagellates, and microzooplankton.

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
Micrococcus luteus `NCBITaxon:1270`	MADIN	—	312	PREGO
Staphylococcus aureus `NCBITaxon:1280`	MADIN	—	312	PREGO
bacillus_licheniformis `NCBITaxon:1402`	MADIN	—	312	PREGO
Clostridium thermoaceticum `NCBITaxon:1525`	MADIN	—	312	PREGO
Listeria monocytogenes `NCBITaxon:1639`	MADIN	—	312	PREGO
chryseobacterium_miricola `NCBITaxon:172045`	MADIN	—	312	PREGO
Mycobacterium kansasii `NCBITaxon:1768`	MADIN	—	312	PREGO
herminiimonas_arsenicoxydans `NCBITaxon:204773`	MADIN	—	312	PREGO
klebsiella_singaporensis `NCBITaxon:244366`	MADIN	—	312	PREGO
Geobacter psychrophilus `NCBITaxon:286698`	MADIN	—	312	PREGO
Pseudomonas aeruginosa `NCBITaxon:287`	MADIN	—	312	PREGO
burkholderia_cepacia `NCBITaxon:292`	MADIN	—	312	PREGO
Brevundimonas diminuta `NCBITaxon:293`	MADIN	—	312	PREGO
pseudomonas_mendocina `NCBITaxon:300`	MADIN	—	312	PREGO
Pelomonas saccharophila `NCBITaxon:304`	MADIN	—	312	PREGO
Microscilla marina ATCC 23134 `NCBITaxon:313606`	MADIN	—	312	PREGO
Pseudomonas stutzeri `NCBITaxon:316`	MADIN	—	312	PREGO
achromobacter_radiobacter `NCBITaxon:358`	MADIN	—	312	PREGO
acinetobacter_johnsonii `NCBITaxon:40214`	MADIN	—	312	PREGO
Rubrobacter radiotolerans `NCBITaxon:42256`	MADIN	—	312	PREGO
Burkholderia thailandensis MSMB43 `NCBITaxon:441157`	MADIN	—	312	PREGO
Planctopirus limnophila DSM 3776 `NCBITaxon:521674`	MADIN	—	312	PREGO
Aerobacter aerogenes `NCBITaxon:548`	MADIN	—	312	PREGO
Escherichia coli `NCBITaxon:562`	MADIN	—	312	PREGO
Acidovorax delafieldii 2AN `NCBITaxon:573060`	MADIN	—	312	PREGO

Showing 25 of 50 kept associations.

Also called

water — ENVO
water — PREGO
waters — PREGO

Curation

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

REVIEW 2026-08-15 · claude-opus-5
Reviewed and endorsed the seeder's own resolution. Co-attestor review (#12): this source names the ontology CURIE itself, so its grounding is definitional rather than a lexical guess — the record IS the term the source pointed at. Recorded so the record it co-attests can reach REVIEWED, which needs every source concept decided. (source concept habitatmech:MADIN.ee80f974c2)
REVIEW 2026-08-15 · claude-opus-5
Reviewed and endorsed the seeder's own resolution. Co-attestor review (#12): this source names the ontology CURIE itself, so its grounding is definitional rather than a lexical guess — the record IS the term the source pointed at. Recorded so the record it co-attests can reach REVIEWED, which needs every source concept decided. (source concept habitatmech:PREGO.9c5507e85a)
ADD_CAUSAL_GRAPH 2026-09-04 · codex
Added a liquid-water planktonic solute-foraging graph backed by PMID:15306380, PMID:25500507, PMID:21663439, PMID:21329211, PMID:23118182, PMID:23204367, and DOI:10.3354/meps010257.

Provenance

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