{
  "id": "ark:/99999/dp-marcescence-litter-chemistry.v1",
  "concept": "ark:/99999/dp-marcescence-litter-chemistry",
  "type": "datasetpaper",
  "title": "Marcescent litter is chemically less recalcitrant than shed litter, so its slower decomposition is not explained by bulk chemistry",
  "discipline": "plant functional ecology",
  "description": "Marcescent (persistent standing-dead) plant litter decomposes more slowly than directly shed litter, which invites a chemical-recalcitrance explanation. T…",
  "url": "https://datasetpapers.com/papers/plant-ecology-marcescence-litter-chemistry/",
  "trust_distance": 0,
  "verification": {
    "claims": 4,
    "re_executed": 4,
    "unverified": 0
  },
  "byline": {
    "software_agent": {
      "name": "Claude Opus 4.8",
      "model_id": "claude-opus-4-8"
    },
    "data_creators": [
      "Sarka Angst",
      "Ondrej Mudrak",
      "Jan Frouz",
      "Veronika Jílková",
      "Renata Schnablova",
      "Petra Straková",
      "Hana Veselá",
      "Gerrit Angst"
    ],
    "question_asker": "Mark Hahnel"
  },
  "source_dataset": {
    "title": "Angst et al. 2024 Functional Ecology raw data (marcescence and decomposition)",
    "doi": "10.6084/m9.figshare.25062800",
    "license": "CC-BY-4.0",
    "landing_url": "https://doi.org/10.6084/m9.figshare.25062800",
    "download_url": "https://ndownloader.figshare.com/files/44230574"
  },
  "components": [
    {
      "name": "analysis",
      "type": "code",
      "path": "analysis.py",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/analysis",
      "produced_by": null
    },
    {
      "name": "fig-1",
      "type": "figure",
      "path": "figures/fig-1-polyphenolics.png",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/fig-1",
      "produced_by": "analysis"
    },
    {
      "name": "fig-2",
      "type": "figure",
      "path": "figures/fig-2-polysaccharides.png",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/fig-2",
      "produced_by": "analysis"
    },
    {
      "name": "fig-3",
      "type": "figure",
      "path": "figures/fig-3-fungi-bacteria.png",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/fig-3",
      "produced_by": "analysis"
    },
    {
      "name": "tbl-1",
      "type": "table",
      "path": "tables/tbl-1-ftir-chemistry.csv",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/tbl-1",
      "produced_by": "analysis"
    },
    {
      "name": "tbl-2",
      "type": "table",
      "path": "tables/tbl-2-fungi-bacteria.csv",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/tbl-2",
      "produced_by": "analysis"
    },
    {
      "name": "tbl-3",
      "type": "table",
      "path": "tables/tbl-3-multiplicity.csv",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/tbl-3",
      "produced_by": "analysis"
    },
    {
      "name": "narrative",
      "type": "narrative",
      "path": "narrative.md",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/narrative",
      "produced_by": null
    }
  ],
  "claims": [
    {
      "n": 1,
      "subject": "marcescent (standing-dead) plant litter",
      "predicate": "has lower polyphenolic (recalcitrant) content than",
      "object": "directly shed litter",
      "assertion_text": "Marcescent litter had significantly lower polyphenolics than shed litter (species-level mean 19.1% vs 27.0% of the FTIR spectrum; paired Wilcoxon signed-rank p < 0.001, rank-biserial r = 0.79, n = 33 species; Benjamini-Hochberg adjusted 0.0005) — the opposite of a chemical-recalcitrance expectation.",
      "supported_by": [
        "fig-1",
        "tbl-1"
      ],
      "confidence": 0.9,
      "novelty_grade": "B",
      "mode": "confirmatory",
      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/claim-1"
    },
    {
      "n": 2,
      "subject": "marcescent (standing-dead) plant litter",
      "predicate": "has higher polysaccharide (labile) content than",
      "object": "directly shed litter",
      "assertion_text": "Marcescent litter had significantly higher polysaccharides than shed litter (26.4% vs 21.8%; paired Wilcoxon p < 0.001, rank-biserial r = 0.62, n = 33 species; Benjamini-Hochberg adjusted 0.0007), indicating it is chemically more labile, not more recalcitrant.",
      "supported_by": [
        "fig-2",
        "tbl-1"
      ],
      "confidence": 0.9,
      "novelty_grade": "B",
      "mode": "confirmatory",
      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/claim-2"
    },
    {
      "n": 3,
      "subject": "the decomposer community fungi:bacteria ratio",
      "predicate": "does not differ significantly between",
      "object": "marcescent and shed litter",
      "assertion_text": "The fungi:bacteria PLFA ratio did not differ significantly between marcescent and shed litter (0.98 vs 1.19; paired Wilcoxon p = 0.20, n = 22 species; non-significant after correction), so there is no evidence for a shift to fungal dominance on marcescent litter in this sample.",
      "supported_by": [
        "fig-3",
        "tbl-2",
        "tbl-3"
      ],
      "confidence": 0.8,
      "novelty_grade": "C",
      "mode": "confirmatory-test-negative",
      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/claim-3"
    },
    {
      "n": 4,
      "subject": "the slower decomposition of marcescent litter",
      "predicate": "is not explained by",
      "object": "greater bulk chemical recalcitrance or a more fungal decomposer community",
      "assertion_text": "Because marcescent litter is chemically more labile (lower polyphenolics, higher polysaccharides) and shows no fungal-dominance shift, its established slower decomposition cannot be attributed to these bulk-chemistry or community markers, redirecting the likely mechanism toward physical or microenvironmental drivers of standing-dead litter.",
      "supported_by": [
        "fig-1",
        "fig-2",
        "fig-3"
      ],
      "confidence": 0.75,
      "novelty_grade": "B",
      "mode": "exploratory",
      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-litter-chemistry.v1/claim-4"
    }
  ],
  "exports": {
    "object_json": "object.json",
    "ro_crate": "ro-crate-metadata.json",
    "code": "analysis.py",
    "emissions": [
      {
        "format": "datapackage",
        "file": "datapackage.json"
      }
    ]
  }
}