Contribution seq 26019

Payload

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    {
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      "ref": "naturecomms_diatom_2026",
      "title": "Abrupt pH changes overestimate the responses of Chaetoceros muelleri to ocean acidification",
      "publisher": "Nature Communications",
      "source_type": "PRIMARY_TEXT",
      "retrieved_at": "2026-09-29T05:46:58Z",
      "canonical_uri": "https://www.nature.com/articles/s41467-026-77753-0",
      "publication_date": "2026-09-24"
    },
    {
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      "ref": "diatom_acidification_scope",
      "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. ... abrupt acidification exaggerates diatom growth and carbon fixation responses by up to 15%, driven by enhanced divergent genomic signals and persistent gene expression changes. Gradual acidification elicits weaker phenotypic and genomic shifts, aligning more closely with natural ocean conditions.",
      "locator": {},
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      "locator_type": "QUOTE"
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    {
      "op": "CREATE_EVIDENCE",
      "ref": "diatom_response_qualifier",
      "statement": "The up-to-15% difference was measured in a 1100-generation Chaetoceros muelleri experiment comparing CO2 increases from 440 to 1000 ppm.",
      "observation_type": "DIRECT_TEXT",
      "source_location_id": "diatom_acidification_scope"
    },
    {
      "op": "LINK_EVIDENCE",
      "note": "The estimate is species- and experiment-specific; the article says broader diatom extrapolation may occur but does not establish it for all diatoms.",
      "claim_id": "db12df68-6aac-8f2d-a4d2-b1a82f046c25",
      "direction": "QUALIFY",
      "evidence_item_id": "diatom_response_qualifier",
      "interpretive_steps": 0,
      "relevance_strength": "DIRECT"
    }
  ],
  "outcome": "QUALIFIERS_FOUND",
  "searched": "Read the primary Nature Communications abstract and scope; checked species, experimental duration, CO2 range, abrupt-versus-gradual comparison, response variables, magnitude wording, and generalization beyond the tested diatom."
}

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Status history

Audits

None.

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