Promotive performance of shrimp Neocaridina denticulata on Typha angustifolia leaf litter decomposition

What was studied

Study shape: Four treatments separated litter alone, direct shrimp contact with feces falling away, feces contact without direct shrimp contact, and shrimp plus litter plus feces together. Each shrimp unit held eight animals and 3 g of air-dried cattail litter. Four independently prepared buckets represented each treatment at each 35-day destructive harvest, for 64 buckets total. Filtered river water was replaced weekly.

Experimental unit: Four-litre bucket, with four independent buckets per treatment and harvest time; the paper describes destructive treatment-by-time units but reports date as a repeated factor without explaining how repeated units were linked

Endpoints: cumulative litter dry-mass loss, decomposition coefficient, interval mass loss, leaf-associated extracellular enzyme activities, pH, chemical oxygen demand, ammonium nitrogen, nitrate nitrogen, total nitrogen, total phosphorus.

Claim boundary

What it can support: After 140 days, cumulative litter mass loss was 51.7 percent in litter-only controls, 83.4 percent where shrimp contacted litter but feces fell away, 57.8 percent where feces contacted litter without shrimp contact, and 84.5 percent where shrimp, litter and feces remained together. The treatment contrasts support faster breakdown when shrimp had direct access under this microcosm protocol; water chemistry and enzyme responses also differed among treatments.

What it cannot support: Litter mass loss is not measured ingestion. Direct shrimp access combines grazing on leaf tissue or associated microbes, fragmentation and physical disturbance, while the reported grazing and feces shares were derived from treatment contrasts rather than measured intake. The experiment used one river population, one cattail preparation, eight shrimp in four litres and filtered river water replaced weekly, which the discussion says helped provide food; no formulated-food baseline was described. Reported zero mortality does not establish dietary adequacy because growth, condition, molting, reproduction and health were not measured. The paper switches between Typha angustifolia and Typha orientalis in treatment text and figure material, gives conflicting one-week versus one-to-two-day animal holding descriptions, does not report random allocation, lacks an obvious sham-mesh control, and does not reconcile destructive harvest with repeated-measures analysis. It also labels P values above 0.05 through 0.10 as biologically significant but noisy. The result does not recommend cattail, catappa or alder, establish a ration or replacement interval, prove a complete diet, or promise home-aquarium water safety.

Publication status audit

Matched in dated Crossref query

The canonical DOI appeared in the dated broad query and carried no registered update in that response. This is a metadata observation, not proof that the work has never changed.

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 (12)

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

• Neocaridina clean the tank Curated claim check
  The exact claim trace uses this record as limitation context: Separates litter breakdown and fecal effects from proven intake or whole-tank cleaning.
• algae 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.
• feeding 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.
• habitat 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.
• Grazing on algae is not the same as cleaning an aquarium Curated evidence comparison
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• algae practical guide Practical guide
  The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
• feeding practical guide Practical guide
  The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
• habitat practical guide Practical guide
  The guide uses this evidence record and its practical wording must remain inside the revised source boundary.
• round1-synthesis-grazing Curated first-round reviewer assignment
  The frozen reviewer scope or consequential-failure check uses this record through the assigned claim trace or comparison and must be reconsidered before invitation or response.
• botanical-litter-outcomes knowledge gap Canonical knowledge gap
  The current knowledge-gap boundary depends on a dated search that used this exact source and must be reconsidered if the source meaning changes.
• botanical-litter-outcomes answerability brief Answerability brief
  The decision, endpoint, minimum design or closure rule may change when evidence used in the linked gap search is corrected.
• botanical-litter-outcomes research allocation Current research allocation
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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.

• Record CSL-JSON citation Citation export
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• Record RIS citation Citation export
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• Complete RIS bibliography Citation export
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• cleanup claims teaching card Generated claim teaching card
  The teaching card is generated from the curated claim wording.
• cleanup claims portable reply Generated claim text
  The portable reply is generated from the curated claim wording.
• algae portable decision card Generated decision-card text
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• feeding portable decision card Generated decision-card text
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• habitat portable decision card Generated decision-card text
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• algae complete visual decision card Generated decision-card visual
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• feeding complete visual decision card Generated decision-card visual
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• habitat complete visual decision card Generated decision-card visual
  The typography-only visual and exact accessibility description derive from the curated decision-card registry and must preserve every card section.
• Promotive performance of shrimp Neocaridina denticulata on Typha angustifolia leaf litter decomposition Canonical evidence page
  The canonical evidence page derives from the current evidence registry record.
• algae evidence dossier Generated guide dossier
  The dossier derives its linked evidence set from the record care path.
• feeding evidence dossier Generated guide dossier
  The dossier derives its linked evidence set from the record care path.
• habitat evidence dossier Generated guide dossier
  The dossier derives its linked evidence set from the record care path.
• cleanup claims review item Generated independent-review item
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• Machine-readable knowledge export Machine-readable knowledge export
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• Research map record Research map
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Historical record needs follow-up decision (3)

Do not silently rewrite history. Decide whether the prior change record remains accurate and publish a new correction or scope note when needed.

• Which direct leaf-litter studies separate preference, consumption, decomposition, water effects and long-term shrimp outcomes? Dated literature search
  The dated search used this exact source as a candidate (included: Promotive performance of shrimp Neocaridina denticulata on Typha angustifolia leaf litter decomposition). Preserve the search history and decide whether a revised or additional search is required.
• Faster cattail breakdown is not measured leaf intake Historical research change
  The historical change cites this source. Preserve the old decision and decide whether a new public correction is required.
• Leaf preference and leaf breakdown are not complete-diet results Historical research change
  The historical change cites this source. Preserve the old decision and decide whether a new public correction is required.

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