Claim

In the study’s 2018 European map, an estimated 27–33% of wetland area occurred in map-defined patches smaller than 25 hectares and 7–11% in patches smaller than 1 hectare.

Type QUANTITATIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 22657

28 words; atomic claims are usually under 25a conjunction joins clauses that may be separately evaluable

Referenced 186 times: checked 3, looked up by assistants 0, viewed 143, shared 40. A count of attention, not evidence.

Topics

Environment · 1efd24fe Earth science · 1efd24fe

Assessment

Supported

Score: 0.9381 under ledger-default@0.3.0 at snapshot 27745

3 of 4 review checks done · 1 counted · 2 by the author only

2 independent evidence lineages · review checks 1 of 4 · stability MEDIUM

Main unresolved issue: 9 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:f120cbc0-62ab-8250-ba8d-5b8a95e2aa4f

Not yet independently audited.Evidence reviewed so far supports this claim, but only 1 of 4 review checks has been done.A quoted passage from nature.com was not found on the page when Galedra fetched it.

Why?

Strongest counted support: Science News Denmark reports the study’s 27–33% and 7–11% fragmentation estimates for mapped European wetlands. weight 1.800000 evidence

Suppressed as dependent: The study calculates these patch-size percentages from contiguous clusters of 10-m cells within each wetland class.; The supplied passage directly reports 27–33% of wetland area in patches below 25 hectares and 7–11% below 1 hectare.

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 Leans supported.

Hide calculation

0.9381 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability MEDIUM · 9 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:ac225b3db770e9836774fa12afac6e5d16735712103af677c23275225e68e218

Last changed at entry seq 24369; nothing logged since has borne on this claim.

How the number was reached

Each counted link is weighed by multiplying the factors the model declares; a factor it does not declare is not shown. Every factor name below links to what that number means.

Link	Working	Weight	Counted as
7e2bfd40 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	1.800000
02414ad4 qualify	relevance DIRECT 2.0 × observation DATASET_RESULT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000 (non directional)
b89a1182 support	relevance DIRECT 2.0 × observation DATASET_RESULT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000
d91e23e9 support	relevance STRONG 1.2 × observation DIRECT_TEXT 0.9 × interpretation 1 step, 1 − 0.15 × 1 0.850000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	0.918000	0.918000
40463ebe support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000 (dependent strongest only, kept b89a1182)
43df4e08 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000 (dependent strongest only, kept b89a1182)
a89b2e03 support	relevance DIRECT 2.0 × observation DIRECT_TEXT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000
8bcf3b65 qualify	relevance DIRECT 2.0 × observation DATASET_RESULT 0.9 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000 (non directional)
67b7a39d qualify	relevance STRONG 1.2 × observation EXPERT_ANALYSIS 0.3 × interpretation 0 steps, 1 − 0.15 × 0 1.000000 × authenticity UNVERIFIED 1.0 × extraction UNVERIFIED 1.0 × provenance SELF 0.0 × edition NAMED_OR_UNRELATED 1	0.000000	0.000000 (non directional)

prior 0.50 → log-odds 0.000000 + 2.718000 (the counted weights) = 2.718000 → probability 0.9381

Under neighbouring settings of the same model: 0.8702 to 0.9716, a spread of 0.1014.

Half-even rounding, six places for weights and four for the probability. The same inputs under the same model reproduce this exactly; that is what the trace hash above is for. How a score is worked out explains every factor, why it is there, and what the model sets it to.

Your view

Registered views

Nobody has registered a view yet.

Registered views are personal belief, not evidence: they never change Galedra's assessment. Affiliations are self-declared and shown only for groups of 5 or more.

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 study’s 2018 European map, an estimated 27–33% of wetland area occurred in map-defined patches smaller than 25 hectares and 7–11% in patches smaller...” · 1 claim · 29 September 2026
“In the study’s 2018 European map, an estimated 27–33% of wetland area occurred in map-defined patches smaller than 25 hectares and 7–11% in patches smaller...” · 1 claim · 29 September 2026
“The Nature study mapped European open wetlands at high resolution and quantified their fragmentation: https://www.nature.com/articles/s41586-026-10760-9” · 2 claims · 29 September 2026

Evidence for

The study estimates that 27–33% of European wetland area is in patches smaller than 25 hectares and 7–11% in patches smaller than 1 hectare.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The institutional release repeats the study’s estimate that 27–33% of wetlands are in patches under 25 hectares and 7–11% under 1 hectare.

From New study pinpoints europe’s most critical wetlands for climate action Read 2026-09-29 Relevance STRONG Steps 1 Counted

Secondary institutional release corroborates the fragmentation percentages; it is not independent of the study’s authors.
The supplied passage directly reports 27–33% of wetland area in patches below 25 hectares and 7–11% below 1 hectare.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The excerpt exactly states both patch-size ranges and their area shares.
Science News Denmark reports the study’s 27–33% and 7–11% fragmentation estimates for mapped European wetlands.

From Europe’s maps miss small wetlands whose climate value is at risk Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Independent news coverage; its underlying source lineage should still be audited.
The Nature study estimates 27–33% of European wetland area in map-defined patches under 25 hectares and 7–11% in patches under 1 hectare.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance DIRECT Steps 0 Counted
The study calculates these patch-size percentages from contiguous clusters of 10-m cells within each wetland class.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

The mapped population is six open wetland types in the 2018 European mapping extent.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Clarifies the wetland population underlying the denominator.
The percentages use contiguous 10-m-cell clusters within each wetland class and are explicitly map-defined patches.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Clarifies the operational definition of patch.
European estimates use independent validation data and design-based stratified estimation.

From Highly fragmented European wetlands with uneven restoration needs Read 2026-09-29 Relevance STRONG Steps 0 Counted

Clarifies the estimation and validation basis.

Suppressed as dependent

Evidence	Group	Kept instead
f5499750		b89a1182
e9e7bf6d		b89a1182

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

From	Relationship	To
d1f95189	NARROWS	95e2aa4f
389e5f2c	NARROWS	95e2aa4f
f774050d	NARROWS	95e2aa4f

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	02414ad4, b89a1182, 40463ebe, 43df4e08, a89b2e03, 8bcf3b65, 67b7a39d

Summary

Supported. The main support is: Science News Denmark reports the study’s 27–33% and 7–11% fragmentation estimates for mapped European wetlands. d4791584

2 further items repeat the same origin and are not independent evidence. f5499750e9e7bf6d

Qualifier: The mapped population is six open wetland types in the 2018 European mapping extent. 5ed5d981

Qualifier: The percentages use contiguous 10-m-cell clusters within each wetland class and are explicitly map-defined patches. 9695f78f

Qualifier: European estimates use independent validation data and design-based stratified estimation. 091c26e7

A narrower version of this claim is supported. d1f95189

Generated by stub-v0.1; every sentence cites graph ids.

Contribution history

seq	event	detail
22657	APPENDED
22658	ACCEPT	AUTOMATIC_AFTER_VALIDATION
22667	LINK_EVIDENCE	by 1efd24fe (accepted)
22683	LINK_EVIDENCE	by 1efd24fe (accepted)
22741	TASK_RESULT	by 1efd24fe (accepted)
23240	TASK_RESULT	by 1efd24fe (accepted)
23250	LINK_EVIDENCE	by 1efd24fe (accepted)
24368	TASK_RESULT	by 1efd24fe (accepted)

Score trace

{
  "claim": "f120cbc0-62ab-8250-ba8d-5b8a95e2aa4f",
  "links": [
    {
      "link": "1c4fae11-2227-848a-a541-dd577e2bfd40",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "5cb2325b-6944-8e12-93a4-03edd4791584",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "link": "29beba92-b01d-8daa-8d95-49ba02414ad4",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "f826a2b8-110d-8084-8d17-9aaf5ed5d981",
      "direction": "QUALIFY",
      "magnitude": "0.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "DATASET_RESULT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "380285bf-3dbe-8aa6-bc38-7478b89a1182",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "c7e08d21-5550-87e7-844c-b0efa05289f5",
      "direction": "SUPPORT",
      "magnitude": "0.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "DATASET_RESULT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "730128da-6d20-8d09-86dc-bdadd91e23e9",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "c526b1da-7414-862b-ac90-5763ac20416d",
      "direction": "SUPPORT",
      "magnitude": "0.918000",
      "relevance": "STRONG",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "SECONDARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.918000",
      "interpretive_steps": 1
    },
    {
      "kept": "380285bf-3dbe-8aa6-bc38-7478b89a1182",
      "link": "877e8eff-7888-8549-b152-092440463ebe",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "e96993e0-a074-867e-a447-7ae8f5499750",
      "direction": "SUPPORT",
      "magnitude": "0.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "kept": "380285bf-3dbe-8aa6-bc38-7478b89a1182",
      "link": "8f9129c5-e711-8e84-8c36-2af043df4e08",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "48aec792-27b3-889b-9212-dcf5e9e7bf6d",
      "direction": "SUPPORT",
      "magnitude": "0.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "95dfb95d-2f0b-8ab3-8b66-216ba89b2e03",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "e32ea70a-538b-865a-915d-174620a78ed9",
      "direction": "SUPPORT",
      "magnitude": "0.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "ddd56bc8-2783-8934-b551-cece8bcf3b65",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "f23f104e-6a62-80fb-b06d-8f7a9695f78f",
      "direction": "QUALIFY",
      "magnitude": "0.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "DATASET_RESULT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    },
    {
      "link": "f0ec7e50-f160-849f-9670-60ca67b7a39d",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "db9dface-f0fd-8c48-a708-ceb4091c26e7",
      "direction": "QUALIFY",
      "magnitude": "0.000000",
      "relevance": "STRONG",
      "extraction": "UNVERIFIED",
      "provenance": "SELF",
      "observation": "EXPERT_ANALYSIS",
      "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": "0.1014",
    "permissive": "0.9716",
    "conservative": "0.8702"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "QUANTITATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9381",
  "provisional": true,
  "evidence_sum": "2.718000",
  "snapshot_seq": 24369,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "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": {
      "by": [],
      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "29beba92-b01d-8daa-8d95-49ba02414ad4",
        "380285bf-3dbe-8aa6-bc38-7478b89a1182",
        "877e8eff-7888-8549-b152-092440463ebe",
        "8f9129c5-e711-8e84-8c36-2af043df4e08",
        "95dfb95d-2f0b-8ab3-8b66-216ba89b2e03",
        "ddd56bc8-2783-8934-b551-cece8bcf3b65",
        "f0ec7e50-f160-849f-9670-60ca67b7a39d"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "2.718000",
  "not_applicable_reason": null,
  "independence_unreviewed": 9
}