Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Biology · 1efd24fe Wildlife · 1efd24fe

Assessment

Why?

Strongest counted support: Dominant-species diversity varied with population, edge density, and green cover, while tested variables did not affect species richness. weight 1.800000 evidence

Suppressed as dependent: The passage directly reports associations for dominant-species diversity and explicitly reports no effects of the considered variables on species richness.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Unresolved.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “In the Italian urban-ant study, dominant-species diversity was higher in less populated cities with greater edge density and higher green-to-impervious...” · 1 claim · 29 September 2026
• “A decade-long Italian citizen-science project surveyed urban ants at national scale and found environmental associations for dominant-species diversity but...” · 2 claims · 29 September 2026

Evidence for

• Dominant-species diversity varied with population, edge density, and green cover, while tested variables did not affect species richness.

  From Engaging the public to unveil urban biodiversity: a decade of ant monitoring in Italy Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The passage directly reports associations for dominant-species diversity and explicitly reports no effects of the considered variables on species richness.

  From Engaging the public to unveil urban biodiversity: a decade of ant monitoring in Italy Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

• An independent dataset paper describes 4,698 standardized urban-ant records and 66 species across Italy, supporting the study's broad sampling context but not its causal associations.

  From Urban ants of Italy from a long-term community science-based dataset for biodiversity research Read 2026-09-29 Relevance MODERATE Steps 0 Counted

  This independent dataset corroborates the scale and standardized sampling context while not independently reproducing the reported environmental associations.

Suppressed as dependent

Evidence	Group	Kept instead
134c5ceb		27937ef0

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	c616b048, 27937ef0, 4dc3def1

Summary

Contribution history

seq	event	detail
15857	APPENDED
15858	ACCEPT	AUTOMATIC_AFTER_VALIDATION
15867	LINK_EVIDENCE	by 1efd24fe (accepted)
15872	TASK_RESULT	by 1efd24fe (accepted)
15925	LINK_EVIDENCE	by 1efd24fe (accepted)

Score trace

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  "claim": "c3f519e8-695f-838f-9efb-c15388c0ee46",
  "links": [
    {
      "link": "621f3807-3381-84d5-a6e6-4246c616b048",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "d827bf84-28b7-8241-9a99-d092b3fe3169",
      "direction": "QUALIFY",
      "magnitude": "0.540000",
      "relevance": "MODERATE",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "DATASET",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "ced1933a-9d2a-8ce6-a47f-36b427937ef0",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "67052310-a064-86c2-95b4-16480ae9dff0",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
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      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
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      "interpretive_steps": 0
    },
    {
      "kept": "ced1933a-9d2a-8ce6-a47f-36b427937ef0",
      "link": "fc2384c8-66f5-87bb-ab96-b7e64dc3def1",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "85dbc7d8-dcfb-8eb0-a856-1a0d134c5ceb",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
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      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.1331",
    "permissive": "0.9121",
    "conservative": "0.7790"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.8581",
  "provisional": true,
  "evidence_sum": "1.800000",
  "snapshot_seq": 15926,
  "prior_log_odds": "0.000000",
  "support_groups": 1,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
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      "ok": false
    },
    "primary_source_reviewed": {
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        "fc2384c8-66f5-87bb-ab96-b7e64dc3def1"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "1.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}