{
  "id": "ark:/99999/dp-marcescence-decomposition.v1",
  "concept": "ark:/99999/dp-marcescence-decomposition",
  "type": "datasetpaper",
  "title": "Marcescent plant litter decomposes more slowly than shed litter, and the slow-down is concentrated in forbs",
  "discipline": "plant functional ecology",
  "description": "Across 34 herbaceous species grown in a common garden, litter that stood as persistent standing-dead (marcescent) tissue lost substantially less mass than…",
  "url": "https://datasetpapers.com/papers/plant-ecology-marcescence-decomposition/",
  "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": [
    {
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      "type": "code",
      "path": "analysis.py",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/analysis",
      "produced_by": null
    },
    {
      "name": "fig-1",
      "type": "figure",
      "path": "figures/fig-1-marcescent-vs-shed.png",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/fig-1",
      "produced_by": "analysis"
    },
    {
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      "type": "figure",
      "path": "figures/fig-2-diff-by-functional-group.png",
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    {
      "name": "fig-3",
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      "produced_by": "analysis"
    },
    {
      "name": "tbl-1",
      "type": "table",
      "path": "tables/tbl-1-species-level.csv",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/tbl-1",
      "produced_by": "analysis"
    },
    {
      "name": "tbl-2",
      "type": "table",
      "path": "tables/tbl-2-by-functional-group.csv",
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      "produced_by": "analysis"
    },
    {
      "name": "tbl-3",
      "type": "table",
      "path": "tables/tbl-3-multiplicity.csv",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/tbl-3",
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    },
    {
      "name": "narrative",
      "type": "narrative",
      "path": "narrative.md",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/narrative",
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    }
  ],
  "claims": [
    {
      "n": 1,
      "subject": "marcescent (persistent standing-dead) plant litter",
      "predicate": "decomposes more slowly than",
      "object": "directly shed litter across herbaceous species",
      "assertion_text": "Across 34 herbaceous species, marcescent litter lost less mass than shed litter (species-level mean 38.5% vs 56.6%; paired Wilcoxon signed-rank z = -4.49, p < 0.001, matched-pairs rank-biserial r = 0.77), decomposing more slowly in 30 of 34 species.",
      "supported_by": [
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      "confidence": 0.95,
      "novelty_grade": "B",
      "mode": "confirmatory",
      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/claim-1"
    },
    {
      "n": 2,
      "subject": "the marcescent-versus-shed decomposition difference",
      "predicate": "depends on plant functional group",
      "object": "being far larger in forbs than in grasses",
      "assertion_text": "The per-species (marcescent - shed) mass-loss difference was -23.1 percentage points in forbs versus -2.2 in grasses (Mann-Whitney U = 18, p = 0.0007; Benjamini-Hochberg adjusted 0.001), so the marcescence effect is functional-group dependent.",
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      "novelty_grade": "B",
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      "ark": "ark:/99999/dp-marcescence-decomposition.v1/claim-2"
    },
    {
      "n": 3,
      "subject": "the marcescent decomposition slow-down",
      "predicate": "is significant within forbs but not within grasses",
      "object": "at the species level",
      "assertion_text": "Within-group paired Wilcoxon tests give p = 0.0001 for forbs (BH-adjusted 0.0002) but p = 0.24 for grasses (non-significant), consistent with the functional-group interaction; the grass result is under-powered (n = 7) rather than a demonstrated null.",
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      "confidence": 0.85,
      "novelty_grade": "B",
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      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/claim-3"
    },
    {
      "n": 4,
      "subject": "microbial biomass on the litter (Cmic)",
      "predicate": "is positively associated with",
      "object": "litter decomposition (percent mass loss)",
      "assertion_text": "Microbial biomass was positively correlated with mass loss (Spearman rho = 0.43, p < 0.001, n = 58; Benjamini-Hochberg adjusted 0.001), an observational association that cannot separate microbial cause from litter-quality confounds.",
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      "confidence": 0.75,
      "novelty_grade": "C",
      "mode": "exploratory",
      "verification_status": "re_executed",
      "ark": "ark:/99999/dp-marcescence-decomposition.v1/claim-4"
    }
  ],
  "exports": {
    "object_json": "object.json",
    "ro_crate": "ro-crate-metadata.json",
    "code": "analysis.py",
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      {
        "format": "datapackage",
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}