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System observation or method study Adjacent aquarium-system evidence

Aquarium Nitrification Revisited: Thaumarchaeota Are the Dominant Ammonia Oxidizers in Freshwater Aquarium Biofilters

Sauder et al., 2011. PLOS ONE 6(8): e23281.

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This record is a claim boundary, not a quality badge. Evidence class and species relationship describe what was studied. They do not make the result universal, complete or automatically applicable to a home aquarium.

Source taxon as published
Freshwater aquarium biofilter microorganisms, not a Neocaridina animal experiment
Environment
Twenty-seven residential and retail freshwater aquarium biofilters in Ontario
Life stages
not applicable
Reviewed
2026-08-12

What was studied

Study shape: qPCR, gene sequencing and water chemistry were compared across sampled freshwater biofilters, with saltwater filters and two supplements as context.

Experimental unit: Sampled aquarium biofilter; technical molecular replicates are not independent aquaria

Endpoints: amoA gene abundance, community fingerprints, ammonium, nitrite, nitrate.

Claim boundary

What it can support: Thaumarchaeal ammonia-oxidizer genes dominated the detectable amoA signal in most sampled freshwater biofilters.

What it cannot support: Gene abundance does not measure complete nitrogen-processing capacity, prove a filter mature or prescribe a product, media volume or cycle duration.

Publication status audit

Canonical DOI outside query result

The record has a canonical DOI but did not appear in the broad Neocaridina query. It requires DOI-specific or alternative-registry status review before any no-update statement.

Metadata snapshot reviewed 2026-08-12. Inspect the method, unmatched queue and limitations.

Correction impact

If this source boundary changes, these are the known downstream consumers. The list distinguishes scientific re-review from generated parity and historical follow-up.

Editorial review required (7)

This curated wording or synthesis must be reconsidered when the source boundary changes. A passing generator test cannot decide the new scientific meaning.

  • A tank is cycled after a fixed number of weeks Curated claim check
    The exact claim trace uses this record as interpretive context: Aquarium nitrification is a measurable microbial process rather than a calendar label.
  • cycling decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • filtration decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • nitrogen decision card Tank-side decision card
    The card translates this guide into an observation, first action, next record and stopping boundary, so all four require editorial review when the source changes.
  • cycling practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • filtration practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
  • nitrogen practical guide Practical guide
    The guide uses this evidence record and its practical wording must remain inside the revised source boundary.

Generated from governing registry (19)

This surface derives from a governing registry and should update with it, but release tests must still prove parity and routing.

Inspect the corpus-wide propagation audit.

How this record is classified

System observation or method study: An aquarium, analytical or biological system was observed without an assigned Neocaridina animal treatment. The species relationship still identifies whether the evidence is biological or system-adjacent.

Adjacent aquarium-system evidence: The source studied aquarium chemistry, filtration, measurement or another engineered system rather than a Neocaridina animal endpoint.

Topics: Filtration, Nitrogen waste

Critically appraise this source without a score

These questions fit this record's system observation or method study role. They are prompts, not automatic judgments. Open the original source to answer them.

  1. Identity and provenance: How were the organism, population, stock and life stage identified and sourced? A published name or seller label can hide a taxonomic, population or life-stage transfer.
  2. Independent unit: What unit was independently assigned or sampled, and how many units support each comparison? Animal counts do not create independent replication when animals share a vessel, site, family or treatment history.
  3. Comparison and context: What was the actual comparator, allocation process, environment, duration and material condition? A result has meaning only against the comparison and conditions that produced it.
  4. Endpoint and measurement: Which endpoint was measured, with what method, unit, timing, resolution and decision rule? One endpoint cannot silently become survival, welfare, diagnosis, reproduction or long-term population performance.
  5. Denominators and missingness: Are starting counts, exclusions, losses, missing observations and analysis denominators reconciled? Unreported or changing denominators can alter the apparent direction, precision and applicability of a result.
  6. Transfer boundary: What is the nearest tempting aquarium claim that this source design cannot establish? Direct evidence can still be narrow, and adjacent evidence can be useful only while the inference remains visible.
  7. System relationship: Was the measured unit an aquarium system, analytical method, another taxon or another biological level? A system or method result is not automatically a Neocaridina animal response.
  8. Inference mechanism: What explicit mechanism or shared property makes the adjacent evidence relevant? Similarity must be stated and tested rather than assumed from a broad label.
  9. Target validation: Has the method or inference been validated in Neocaridina, the intended water, life stage and decision range? Analytical validity in one matrix or biological validity in another species may not transfer.
  10. Permitted use: Is the source being used only for its method or system role rather than promoted to animal evidence? Useful adjacent evidence becomes misleading when its role is silently upgraded.

Read the complete appraisal framework.

Where it is used

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