Claim

In the study, abrupt acidification produced diatom growth and carbon-fixation responses up to 15% larger than under gradual acidification.

Type QUANTITATIVE · truth-evaluable: yes · status at snapshot: ACTIVE · created seq 19921

a conjunction joins clauses that may be separately evaluable

Referenced 125 times: checked 1, looked up by assistants 0, viewed 98, shared 26. A count of attention, not evidence.

Topics

Biology · 1efd24fe Climate · 1efd24fe

Assessment

Supported

Score: 0.8808 under ledger-default@0.3.0 at snapshot 27745

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

1 independent evidence lineage · review checks 1 of 4 · stability MEDIUM

Main unresolved issue: 3 counted evidence items have no independence review; repeats of one origin may be counted as several coverage:db12df68-6aac-8f2d-a4d2-b1a82f046c25

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

Why?

Strongest counted support: The primary study reports the difference in growth and carbon-fixation responses. weight 2.000000 evidence

Suppressed as dependent: The passage directly reports that abrupt acidification exaggerates diatom growth and carbon-fixation responses by up to 15%.

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.

Hide calculation

0.8808 under ledger-default@0.3.0 at snapshot 27745 · state Supported · Review checks: 1 of 4 · stability MEDIUM · 3 sources, 1 independent lineage

Model ledger-default@0.3.0 (the default model, not the answer) · snapshot 27745 · trace sha256:17838f1d6161eef731aac47923060d6afd766a11224bc70eeca2d800449ee249

Last changed at entry seq 26020; 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
cd6169a8 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
01757e13 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 cd6169a8)
ba6b23b7 qualify	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 (non directional)

prior 0.50 → log-odds 0.000000 + 2.000000 (the counted weights) = 2.000000 → probability 0.8808

Under neighbouring settings of the same model: 0.8022 to 0.9309, a spread of 0.1287.

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.

“A long-term evolution experiment compared abrupt and gradual ocean acidification in the marine diatom Chaetoceros muelleri.” · 3 claims · 29 September 2026

Evidence for

The primary study reports the difference in growth and carbon-fixation responses.

From Abrupt pH changes overestimate the responses of Chaetoceros muelleri to ocean acidification Read 2026-09-29 Relevance DIRECT Steps 0 Counted

Primary quantitative result.
The passage directly reports that abrupt acidification exaggerates diatom growth and carbon-fixation responses by up to 15%.

From Abrupt pH changes overestimate the responses of Chaetoceros muelleri to ocean acidification Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The excerpt identifies abrupt acidification, both responses, and the up-to-15% comparison.

Evidence against

None.

Qualifications

The up-to-15% difference was measured in a 1100-generation Chaetoceros muelleri experiment comparing CO2 increases from 440 to 1000 ppm.

From Abrupt pH changes overestimate the responses of Chaetoceros muelleri to ocean acidification Read 2026-09-29 Relevance DIRECT Steps 0 Counted

The estimate is species- and experiment-specific; the article says broader diatom extrapolation may occur but does not establish it for all diatoms.

Suppressed as dependent

Evidence	Group	Kept instead
b73c7509		cd6169a8

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	cd6169a8, 01757e13, ba6b23b7

Summary

Supported. The main support is: The primary study reports the difference in growth and carbon-fixation responses. 36f8ae29

1 further item repeats the same origin and is not independent evidence. b73c7509

Qualifier: The up-to-15% difference was measured in a 1100-generation Chaetoceros muelleri experiment comparing CO2 increases from 440 to 1000 ppm. 60aa0347

Review checks: 1 of 4. coverage:db12df68-6aac-8f2d-a4d2-b1a82f046c25

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

Contribution history

seq	event	detail
19921	APPENDED
19922	ACCEPT	AUTOMATIC_AFTER_VALIDATION
19937	LINK_EVIDENCE	by 1efd24fe (accepted)
24802	TASK_RESULT	by 1efd24fe (accepted)
26019	TASK_RESULT	by 1efd24fe (accepted)

Score trace

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  "claim": "db12df68-6aac-8f2d-a4d2-b1a82f046c25",
  "links": [
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      "link": "2317a6d7-ddc6-8676-b82b-f5f0cd6169a8",
      "group": null,
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      "direction": "SUPPORT",
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      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
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    {
      "kept": "2317a6d7-ddc6-8676-b82b-f5f0cd6169a8",
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      "group": null,
      "reason": "dependent_strongest_only",
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      "audit_confirmed": false,
      "effective_weight": "0.000000",
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    },
    {
      "link": "f2298df0-79e2-8a21-933f-96d8ba6b23b7",
      "group": null,
      "reason": "non_directional",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "96640693-faf4-8ca2-a7a8-fa9760aa0347",
      "direction": "QUALIFY",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
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      "audit_confirmed": false,
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  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.1287",
    "permissive": "0.9309",
    "conservative": "0.8022"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "MEDIUM",
  "claim_type": "QUANTITATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.8808",
  "provisional": true,
  "evidence_sum": "2.000000",
  "snapshot_seq": 26020,
  "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": {
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      "ok": false
    },
    "opposing_search_done": {
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    },
    "independence_reviewed": {
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      "ok": false
    },
    "primary_source_reviewed": {
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        "5e07c936-9b50-8826-87ea-69df01757e13",
        "f2298df0-79e2-8a21-933f-96d8ba6b23b7"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "2.000000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}