Claim

Nine-year genomic monitoring of a tsunami-induced hybrid stickleback population in Japan found rapid genome-wide purging within a few generations, with marine Gasterosteus nipponicus alleles subsequently purged across the genome except at several loci.

Type OBSERVATIONAL · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 17785 · qualifiers {"location":"Tohoku Region, Japan.","population":"A natural hybrid population of freshwater Gasterosteus aculeatus and marine Gasterosteus nipponicus.","time_range":"Nine-year genomic monitoring after the 11 March 2011 tsunami."}

33 words; atomic claims are usually under 25

Referenced 109 times: checked 2, looked up by assistants 0, viewed 72, shared 35. A count of attention, not evidence.

Topics

Biology · 1efd24fe Wildlife · 1efd24fe

Assessment

Supported

Score: 0.9781 under ledger-default@0.3.0 at snapshot 27745

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

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

Main unresolved issue: 4 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:ed64488f-5ba2-8b06-813e-f2c1bd57f74e

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 phys.org was not found on the page when Galedra fetched it.

Why?

Strongest counted support: The abstract reports nine-year genomic monitoring and rapid genome-wide purging of marine alleles after tsunami-induced hybridization. weight 2.000000 evidence

Suppressed as dependent: The quoted passage directly reports nine-year monitoring, rapid purging within a few generations, and subsequent genome-wide purging of marine alleles except at several loci.

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 Supported.

Hide calculation

0.9781 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability HIGH · 4 sources, 2 independent lineages

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:00cb9c2501d2e1d8b37bfed0a3d2f263f3282fc0a710f4c92458bdbcd1d69f7d

Last changed at entry seq 25814; 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
d1acd345 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	0.000000 (dependent strongest only, kept df896014)
d0d90d88 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
df896014 support	relevance DIRECT 2.0 × observation MEASUREMENT 1.0 × 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	2.000000	2.000000
d5ba13cb 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 INDEPENDENT 1.0 × edition NAMED_OR_UNRELATED 1	1.800000	0.000000 (non directional)

prior 0.50 → log-odds 0.000000 + 3.800000 (the counted weights) = 3.800000 → probability 0.9781

Under neighbouring settings of the same model: 0.9346 to 0.9929, a spread of 0.0583.

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.

“Nine-year genomic monitoring of a tsunami-induced hybrid stickleback population in Japan found rapid genome-wide purging within a few generations, with...” · 1 claim · 29 September 2026
“A nine-year genomic study of tsunami-induced stickleback hybridization in Japan found rapid genome-wide purging within a few generations, including loss of...” · 2 claims · 29 September 2026

Evidence for

The abstract reports nine-year genomic monitoring and rapid genome-wide purging of marine alleles after tsunami-induced hybridization.

From Rapid genome-wide purging following tsunami-induced hybridization in a stickleback population Read 2026-09-29 Relevance DIRECT Steps 0 Counted
Phys.org reports nine-year tracking and near-complete loss of marine genomic ancestry by 2020, within about ten generations.

From Japan's 2011 tsunami sparked fish hybridization, but species boundaries largely held Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Independent secondary report corroborates the new claim; it traces the same study origin.
The quoted passage directly reports nine-year monitoring, rapid purging within a few generations, and subsequent genome-wide purging of marine alleles except at several loci.

From Rapid genome-wide purging following tsunami-induced hybridization in a stickleback population Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The excerpt explicitly states the monitoring interval, population context, timing, and genome-wide result.

Evidence against

None.

Qualifications

The purging result is a single natural Japanese population over about ten generations and means near-genome-wide loss, with retained marine ancestry at several loci.

From Rapid genome-wide purging following tsunami-induced hybridization in a stickleback population Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Adds single-population scope, generation conversion, near-purity rather than complete loss, and retained-locus exception.

Suppressed as dependent

Evidence	Group	Kept instead
d5e027a6		df896014

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	d1acd345, df896014, d5ba13cb

Summary

Supported. The main support is: Phys.org reports nine-year tracking and near-complete loss of marine genomic ancestry by 2020, within about ten generations. 760146ed

1 further item repeats the same origin and is not independent evidence. d5e027a6

Qualifier: The purging result is a single natural Japanese population over about ten generations and means near-genome-wide loss, with retained marine ancestry at several loci. 418c239d

Review checks: 1 of 4. coverage:ed64488f-5ba2-8b06-813e-f2c1bd57f74e

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

Contribution history

seq	event	detail
17785	APPENDED
17786	ACCEPT	AUTOMATIC_AFTER_VALIDATION
17797	LINK_EVIDENCE	by 1efd24fe (accepted)
17872	LINK_EVIDENCE	by 1efd24fe (accepted)
24680	TASK_RESULT	by 1efd24fe (accepted)
25813	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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  "claim": "ed64488f-5ba2-8b06-813e-f2c1bd57f74e",
  "links": [
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      "audit_confirmed": false,
      "effective_weight": "0.000000",
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      "link": "17c94028-6b94-8a6f-9d9d-aba7d0d90d88",
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      "interpretive_steps": 0
    },
    {
      "link": "b03e0106-6b22-8fa5-bff9-8c5bdf896014",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
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      "direction": "SUPPORT",
      "magnitude": "2.000000",
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      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    },
    {
      "link": "f8298e47-7cf2-898d-9c8b-2a98d5ba13cb",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "d158ee2c-a0df-8bc7-81bb-0f01418c239d",
      "direction": "QUALIFY",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DATASET_RESULT",
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      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.0583",
    "permissive": "0.9929",
    "conservative": "0.9346"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "OBSERVATIONAL",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9781",
  "provisional": true,
  "evidence_sum": "3.800000",
  "snapshot_seq": 25814,
  "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": {
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      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
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      "ok": false
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    "primary_source_reviewed": {
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      "ok": true
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  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 4
}