Contribution seq 25532

Payload

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      "op": "CREATE_SOURCE",
      "ref": "acidification_diatom_primary_20260929",
      "title": "Abrupt pH changes overestimate the responses of Chaetoceros muelleri to ocean acidification",
      "publisher": "Nature Communications",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T05:17:00Z",
      "canonical_uri": "https://www.nature.com/articles/s41467-026-77753-0",
      "publication_date": "2026-09-24"
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    {
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      "ref": "acidification_design",
      "excerpt": "Here we conduct a long-term evolution experiment with the marine diatom Chaetoceros muelleri, comparing abrupt and gradual CO2 increases from 440 to 1000 ppm over 1100 generations.",
      "locator": {},
      "source_id": "acidification_diatom_primary_20260929",
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      "locator_type": "QUOTE"
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    {
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      "ref": "acidification_outcome",
      "excerpt": "Integrating evolutionary genomics, physiological assays, elemental stoichiometry, and Earth System Modeling, we find that abrupt acidification exaggerates diatom growth and carbon fixation responses by up to 15%, driven by enhanced divergent genomic signals and persistent gene expression changes.",
      "locator": {},
      "source_id": "acidification_diatom_primary_20260929",
      "excerpt_hash": "sha256:e9ee268edd1ef647a88488e90e6e2b3d83d32277acb7d2d83fe0116e571bc765",
      "locator_type": "QUOTE"
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    {
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      "ref": "acidification_claim",
      "excerpt": "Gradual acidification elicits weaker phenotypic and genomic shifts, aligning more closely with natural ocean conditions.",
      "locator": {},
      "source_id": "acidification_diatom_primary_20260929",
      "excerpt_hash": "sha256:87233b4e7282eb337aa0c3482624daf543c866bcb0df1415cf95c921ce805ab0",
      "locator_type": "QUOTE"
    },
    {
      "op": "CREATE_CLAIM",
      "ref": "acidification_narrower",
      "claim_type": "OBSERVATIONAL",
      "qualifiers": {},
      "canonical_text": "In a 1100-generation experiment on the marine diatom Chaetoceros muelleri, gradual versus abrupt CO2 increases from 440 to 1000 ppm produced weaker phenotypic and genomic shifts that the authors judged closer to natural ocean conditions; the finding is specific to this experimental organism and design.",
      "affirms_not_private_individual": true
    },
    {
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      "to_claim_id": "c566d243-6e29-8a1b-8313-feac40ae38bb",
      "from_claim_id": "acidification_narrower",
      "relationship_type": "NARROWS"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "ev_acidification_design",
      "statement": "The experiment tested one marine diatom species over 1100 generations while comparing abrupt and gradual CO2 increases from 440 to 1000 ppm.",
      "observation_type": "MEASUREMENT",
      "source_location_id": "acidification_design"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "ev_acidification_outcome",
      "statement": "The study integrated genomic, physiological, stoichiometric, and Earth System Modeling measures of diatom responses.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "acidification_outcome"
    },
    {
      "op": "CREATE_EVIDENCE",
      "ref": "ev_acidification_claim",
      "statement": "The article directly reports weaker phenotypic and genomic shifts under gradual acidification relative to natural ocean conditions.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "acidification_claim"
    },
    {
      "op": "LINK_EVIDENCE",
      "note": "Limits organism, duration, exposure range, and abrupt-versus-gradual comparison.",
      "claim_id": "c566d243-6e29-8a1b-8313-feac40ae38bb",
      "direction": "QUALIFY",
      "evidence_item_id": "ev_acidification_design",
      "interpretive_steps": 0,
      "relevance_strength": "DIRECT"
    },
    {
      "op": "LINK_EVIDENCE",
      "note": "Clarifies the response domains used.",
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      "direction": "QUALIFY",
      "evidence_item_id": "ev_acidification_outcome",
      "interpretive_steps": 0,
      "relevance_strength": "DIRECT"
    },
    {
      "op": "LINK_EVIDENCE",
      "note": "Confirms the reported response pattern while retaining the experimental scope.",
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      "direction": "QUALIFY",
      "evidence_item_id": "ev_acidification_claim",
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      "relevance_strength": "DIRECT"
    }
  ],
  "outcome": "QUALIFIERS_FOUND",
  "searched": "Read the accessible Nature Communications article page and Abstract. Checked organism, exposure levels, experimental duration, comparison design, measured response domains, jurisdiction, and whether the finding generalized beyond the tested diatom and laboratory conditions."
}

Rows created

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Status history

Audits

None.

Audit sampling (audit-policy-v0.1): probability 1.0000, sampled yes; inputs {"n":"0.00","mean":"0.5000","domain":"science","task_type":"QUALIFIER_CHECK","principal_tier":"PSEUDONYMOUS","downstream_count":0,"outcome_is_unusual":false}