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: The abstract reports an approximately 24.6% reduction in genome-wide heterozygosity across Britain. weight 2.000000 evidence

Suppressed as dependent: The excerpt directly reports 101 museum specimens, 1894–2019, and an approximately 24.6% Britain-wide heterozygosity reduction.

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.

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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.

• “Whole-genome data from 101 museum specimens indicate an approximately 24.6% reduction in genome-wide heterozygosity in the moss carder bumblebee across...” · 1 claim · 29 September 2026
• “Whole-genome data from 101 museum specimens of the moss carder bumblebee collected across Britain and Ireland from 1894 to 2019 showed a 24.6% reduction in...” · 2 claims · 29 September 2026

Evidence for

• The abstract reports an approximately 24.6% reduction in genome-wide heterozygosity across Britain.

  From Museum specimens reveal the genomic consequences of long-term population decline in an insect pollinator Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The study commentary reports about a 25% reduction in genome-wide genetic diversity and progressive twentieth-century heterozygosity decline in the moss carder bumblebee.

  From A century of genetic erosion in a British bumblebee – a new study just published Read 2026-09-29 Relevance STRONG Steps 1 Counted

  Author commentary about the same study; corroborating context, not an independent research lineage.

• The excerpt directly reports 101 museum specimens, 1894–2019, and an approximately 24.6% Britain-wide heterozygosity reduction.

  From Museum specimens reveal the genomic consequences of long-term population decline in an insect pollinator Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Evidence against

None.

Qualifications

• The estimate is based on a museum-derived sample of more than 100 specimens from five UK institutions collected across 1890–2019, not a census of the British population.

  From Threatened British bumblebee populations face severe genetic declines Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The heterozygosity decline is Britain-wide, while the accompanying inbreeding signal is specifically emphasized for England and Wales and is not uniform across Britain.

  From Threatened British bumblebee populations face severe genetic declines Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• Genome-based checking found 29 initially identified museum specimens were close relatives, an important sampling and denominator qualification.

  From Threatened British bumblebee populations face severe genetic declines Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Suppressed as dependent

Evidence	Group	Kept instead
54dd1cf5		8d991d4b

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

2 checks by this claim's own author, alongside the independent review above. 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	8d991d4b, 65f8e3e8

Summary

Contribution history

seq	event	detail
18460	APPENDED
18461	ACCEPT	AUTOMATIC_AFTER_VALIDATION
18472	LINK_EVIDENCE	by 1efd24fe (accepted)
18524	LINK_EVIDENCE	by 1efd24fe (accepted)
24711	TASK_RESULT	by 1efd24fe (accepted)
25901	TASK_RESULT	by 1efd24fe (accepted)