biofilm

ENVO:00002034 ·resolve ·AQUATIC ·EXACT SEEDED

A complex aggregation of microorganisms marked by the excretion of a protective and adhesive matrix; usually adhering to a substratum. — 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	biofilm Physicochemical parameter bands from kg-microbe's environment table.	—
GOLD	Environmental > Aquatic > Marine > Biofouling > Microfouling/Biofilm	—
GOLD	Environmental > Aquatic > Freshwater > Biofouling > Microfouling/Biofilm	—
GOLD	Environmental > Aquatic > Non-marine Saline and Alkaline > Biofouling > Microfouling/Biofilm	—
MADIN	biofilm	39	TAXON
PREGO	biofilm	325	TAXON

Broader habitats

mass of biological material ENVO:01000549
Biofouling habitatmech:GOLD.3ec896865d
Biofouling habitatmech:GOLD.4bd2954af9
Biofouling habitatmech:GOLD.ec116f9a37

Environmental parameters

Physicochemical parameters
Parameter	Value	Source
GRADIENTS	high	kg-microbe environments.csv (biofilm)
NUTRIENTS	high	kg-microbe environments.csv (biofilm)
ORGANIC_MATTER	high	kg-microbe environments.csv (biofilm)
SALINITY_VARIABILITY	small	kg-microbe environments.csv (biofilm)
STRUCTURAL_COMPLEXITY	medium	kg-microbe environments.csv (biofilm)
WATER_AVAILABILITY	high	kg-microbe environments.csv (biofilm)

Causal graphs

Biofilm EPS gradient structuring

Biofilms arise when microbial cells adhere to a substratum, remain together as an aggregate, and secrete an extracellular polymeric matrix. The matrix anchors cells and public goods near a surface, retains extracellular enzymes, slows solute transport, and creates oxygen and nutrient gradients that differentiate the biofilm into physiologically distinct microzones.

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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biofilm_eps_gradient_structuring edges
Edge	Subject	Predicate	Object	Evidence
`biofilm_determined_by_aggregate`	biofilm	determined by A biofilm is a surface-associated microbial aggregate whose cells remain together in a shared matrix.	surface-associated microbial aggregate	`PMID:27510863` Flemming and colleagues reviewed bacterial biofilms as surface-associated communities embedded in self-produced matrix.
`aggregate_adheres_to_substratum`	surface-associated microbial aggregate	adheres to Biofilm organisms use surface adhesion to persist on a substratum rather than living only as planktonic cells.	substratum	`PMID:27510863` The biofilm lifestyle review describes surface attachment as a central transition in the development of biofilm communities.
`aggregate_expresses_surface_adhesion`	surface-associated microbial aggregate	expresses Adhesive traits let cells attach to surfaces and seed multicellular growth.	surface adhesion	`DOI:10.1038/nrmicro.2016.94` Flemming and colleagues reviewed adhesins and appendages that mediate attachment during biofilm development.
`surface_adhesion_enables_aggregation`	surface adhesion	enables Surface attachment keeps founder cells in place long enough for clonal growth and recruitment to build a microbial aggregate.	surface-associated microbial aggregate	`DOI:10.1038/nrmicro.2016.94` The Nature Reviews Microbiology review covers attachment and aggregate development as linked stages of biofilm formation.
`aggregate_produces_matrix`	surface-associated microbial aggregate	produces Biofilm cells secrete extracellular polymeric substances that assemble into the surrounding biofilm matrix.	extracellular polymeric matrix	`PMID:20676145` Flemming and Wingender reviewed the extracellular polymeric substances that form the self-produced matrix of biofilms.
`matrix_contains_edna`	extracellular polymeric matrix	contains Extracellular DNA is one structural constituent of the biofilm matrix.	extracellular DNA	`DOI:10.1038/nrmicro2415` The biofilm-matrix review summarizes extracellular DNA among common matrix components.
`matrix_contains_polysaccharides`	extracellular polymeric matrix	contains Matrix polysaccharides provide hydrated polymers that surround and support embedded cells.	matrix polysaccharides	`DOI:10.1038/nrmicro2415` Flemming and Wingender reviewed polysaccharides as major constituents of extracellular polymeric matrices.
`matrix_contains_proteins`	extracellular polymeric matrix	contains Proteinaceous adhesins and amyloid fibers contribute to matrix architecture and intercellular contacts.	matrix proteins	`PMID:20676145` The matrix review describes protein components that contribute to biofilm matrix structure and function.
`matrix_anchors_aggregate`	extracellular polymeric matrix	retains The extracellular matrix embeds cells and keeps the community cohesive on the surface.	surface-associated microbial aggregate	`PMID:20676145` Flemming and Wingender describe the matrix as the extracellular material surrounding and holding biofilm cells together.
`matrix_generates_cell_cohesion`	extracellular polymeric matrix	produces Shared matrix polymers create cohesion among neighboring biofilm cells.	cell-cell cohesion	`DOI:10.1038/nrmicro2415` The biofilm-matrix review discusses matrix polymers as mediators of stable multicellular organization.
`matrix_retains_extracellular_enzymes`	extracellular polymeric matrix	retains Matrix material keeps secreted enzymes close to the cells that invested in producing them.	extracellular enzymes	`PMID:20676145` Flemming and Wingender reviewed enzyme retention as one function of the extracellular biofilm matrix.
`retained_enzymes_drive_external_digestion`	extracellular enzymes	drives Matrix-retained enzymes support extracellular degradation of polymers and particles near the aggregate.	matrix-localized external digestion	`PMID:20676145` The matrix review explains how localized extracellular enzymes let biofilms metabolize polymers outside the cell.
`matrix_limits_diffusion`	extracellular polymeric matrix	produces Cells and extracellular matrix slow transport of oxygen, electron acceptors, and nutrients through the biofilm depth.	diffusion limitation	`PMID:35149841` Jo, Price-Whelan, and Dietrich reviewed gradient formation and physiological differentiation in biofilms.
`diffusion_limitation_forms_gradients`	diffusion limitation	produces Consumption and limited inward diffusion form steep chemical gradients across a spatially constrained biofilm.	oxygen and nutrient gradients	`DOI:10.1038/s41579-022-00692-2` The gradient review describes biofilm resource gradients generated by local metabolism and spatial transport limits.
`gradients_drive_heterogeneity`	oxygen and nutrient gradients	drives Oxygen and nutrient gradients make nearby biofilm cells occupy different metabolic states.	physiological heterogeneity	`PMID:35149841` Jo and colleagues reviewed how gradients in biofilms cause physiological differentiation among cells in the same assemblage.
`heterogeneity_selects_stress_tolerance`	physiological heterogeneity	selects for Slow-growing and resource-limited biofilm zones increase the prevalence of cells tolerant of chemical or physical stress.	stress-tolerant subpopulations	`PMID:35149841` The heterogeneity review links gradient-driven physiological differentiation in biofilms to stress tolerance.

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
chryseobacterium_molle `NCBITaxon:216903`	MADIN	—	39	PREGO
hoyosella_altamirensis `NCBITaxon:616997`	MADIN	—	39	PREGO
Capnocytophaga gingivalis `NCBITaxon:1017`	PREGO	1	325
Capnocytophaga ochracea `NCBITaxon:1018`	PREGO	2	325
Capnocytophaga sputigena `NCBITaxon:1019`	PREGO	3	325
Rhodospirillum rubrum `NCBITaxon:1085`	PREGO	4	325
Leptotrichia trevisanii `NCBITaxon:109328`	PREGO	5	325
Arthrobacter sp. 'SMCC G984' `NCBITaxon:110639`	PREGO	6	325
Hominimerdicola alba `NCBITaxon:1264`	PREGO	7	325
Ruminococcus flavefaciens `NCBITaxon:1265`	PREGO	8	325
Micrococcus luteus `NCBITaxon:1270`	PREGO	9	325
Staphylococcus epidermidis `NCBITaxon:1282`	PREGO	10	325
Carboxydothermus hydrogenoformans `NCBITaxon:129958`	PREGO	11	325
Streptococcus parasanguinis `NCBITaxon:1318`	PREGO	12	325
Bacillus sp. (in: firmicutes) `NCBITaxon:1409`	PREGO	13	325
Limosilactobacillus vaginalis DSM 5837 = ATCC 49540 `NCBITaxon:1423814`	PREGO	14	325
Clostridium `NCBITaxon:1485`	PREGO	15	325
[Clostridium] symbiosum `NCBITaxon:1512`	PREGO	16	325
[Clostridium] aminophilum `NCBITaxon:1526`	PREGO	17	325
Anaerocolumna aminovalerica `NCBITaxon:1527`	PREGO	18	325
Hungatella hathewayi `NCBITaxon:154046`	PREGO	19	325
Clostridium subterminale `NCBITaxon:1550`	PREGO	20	325
Leptotrichia wadei `NCBITaxon:157687`	PREGO	21	325
Megamonas hypermegale `NCBITaxon:158847`	PREGO	22	325
Lactobacillus gasseri `NCBITaxon:1596`	PREGO	23	325

Showing 25 of 50 kept associations.

Also called

Microfouling/Biofilm — GOLD
biofilms — PREGO

Curation

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

GROUND 2026-08-12 · claude-opus-5
Grounded to ENVO:00002034 'biofilm' (EXACT). Slash alternative naming one thing; grounded to the head term. ENVO preferred over BTO for an environmental biofilm. Pulled out of the class-level sweep, whose note wrongly claimed no term matched. Label: 'Microfouling/Biofilm'. (source concept habitatmech:GOLD.00cc26ac8b)
GROUND 2026-08-12 · claude-opus-5
Grounded to ENVO:00002034 'biofilm' (EXACT). Slash alternative naming one thing; grounded to the head term. ENVO preferred over BTO for an environmental biofilm. Pulled out of the class-level sweep, whose note wrongly claimed no term matched. Label: 'Microfouling/Biofilm'. (source concept habitatmech:GOLD.3911678ce4)
GROUND 2026-08-12 · claude-opus-5
Grounded to ENVO:00002034 'biofilm' (EXACT). Slash alternative naming one thing; grounded to the head term. ENVO preferred over BTO for an environmental biofilm. Pulled out of the class-level sweep, whose note wrongly claimed no term matched. Label: 'Microfouling/Biofilm'. (source concept habitatmech:GOLD.f8048a6e2a)
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.94bda4d522)
ADD_CAUSAL_GRAPH 2026-09-04 · codex
Added a biofilm EPS gradient structuring graph backed by PMID:27510863, DOI:10.1038/nrmicro.2016.94, PMID:20676145, DOI:10.1038/nrmicro2415, PMID:35149841, and DOI:10.1038/s41579-022-00692-2.

Provenance

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