https://w3id.org/np/RAvVR9Re79H23sELPwIDo0mENN_iqMEl-0FGIin_bQTLE
.trig | .trig.txt | .jelly | .jelly.txt | .jsonld | .jsonld.txt | .nq | .nq.txt | .xml | .xml.txt
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<https://w3id.org/delphi/resource/assessment/darwin1859-ch04-20--claim-test> a <https://w3id.org/delphi/ontology/Assessment>;
dc:description "Jena 2002 plot biomass (the sown-community dry-weight column) was joined to the plot-information table linked from that PANGAEA record, which holds the sown species number. The highest sown richness is 60 and has 4 plots, below the pre-registered minimum of 8, so Jena does not qualify. Cedar Creek E120 was read from the LTER member node because the PASTA public read returned HTTP 403. Live biomass, excluding rows labelled litter, was summed to plot-year. NumSp 0 was dropped. For each of 26 years with at least 8 monocultures and 8 plots at 16 sown species, the monoculture ratio and the Spearman correlation were computed, and the medians were the dataset statistics. A year-level p-value had to be below 0.01 in every qualifying year. Functional-group correlations were computed and were not used for the verdict.";
<http://www.w3.org/2000/01/rdf-schema#comment> "Measured: 2.781371 median across 26 Cedar Creek years of mean biomass at 16 sown species divided by mean monoculture biomass (n = 4162, yearly ratios from 1.683597 to 3.954947; median Spearman rho 0.662979; largest yearly two-sided p 4.37e-6). Interpretation: Darwin's amount of life is read as harvested aboveground plant biomass, and diversification of structure is read as the number of species the experimenters sowed. That is a species-count proxy, not a measurement of structural or functional-trait diversity. The experiments are grasslands at Jena and Cedar Creek, not a sample of every local community, and they contain no animals. A higher biomass in richer plots is the pattern the claim predicts for these plant plots. It does not show that the greatest possible amount of life, across all habitats, is caused by structural divergence.";
<http://www.w3.org/2000/01/rdf-schema#label> "Claim test of darwin1859-ch04-20: mixed, confidence 0.64";
<http://www.w3.org/2000/01/rdf-schema#seeAlso> <https://github.com/fractastical/delphisci/blob/bf2af6ee0a84e23ffa6414ad7a0a50a8c276506e/test-data/claim-tests/darwin-origin/darwin1859-ch04-20/result.json>;
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<https://w3id.org/delphi/ontology/admissibleDatasets> "A plant biodiversity experiment that assigns sown species number and measures aboveground community biomass on the same plots, public and reusable. Observational surveys without an assigned richness do not qualify.";
<https://w3id.org/delphi/ontology/assessmentType> "claim-test/0.1.0";
<https://w3id.org/delphi/ontology/dataKind> "biological";
<https://w3id.org/delphi/ontology/disconfirmingObservation> "In either experiment, monocultures have higher mean aboveground biomass than the highest sown richness.";
<https://w3id.org/delphi/ontology/evidenceAgainst> "Functional-group count, which was not a verdict statistic, has Spearman rho 0.362801 with biomass at Jena (82 plots) and 0.44725 across Cedar Creek plot-years. The Cedar Creek figure pools years and the plot-years are not independent.",
"Jena does not qualify. Its highest sown richness is 60 species and that level has 4 plots, under the pre-registered minimum of 8. Sixteen monocultures are present. The Jena richness comparison was not used for the verdict.",
"Miscellaneous litter was excluded from Cedar Creek totals. The PASTA public API returned HTTP 403; the table was read from the LTER DataONE member node. That node's licence statement was not retrieved, so the Cedar Creek licence is null here.",
"Plant plots only, in two grassland experiments. Animals and natural communities were not tested. Sown species number is a proxy for diversification of structure, not a trait or body-plan measurement.",
"Support required both experiments. Cedar Creek passes: median biomass ratio 2.781371, median Spearman rho 0.662979, and every one of 26 years has two-sided p below 0.01. The smallest yearly ratio is 1.683597, still above 1.50.",
"The PANGAEA page states Creative Commons Attribution 3.0 Unported.";
<https://w3id.org/delphi/ontology/expectedObservation> "In both plant experiments, mean aboveground biomass at the highest sown richness is at least 1.5 times the monoculture mean, and biomass rises with sown richness.";
<https://w3id.org/delphi/ontology/failCriterion> "Pre-registered. REFUTES if either qualifying dataset has ratio below 1.0, computed on a year or a pooled single year with at least 8 monoculture plots and at least 8 plots at the highest richness. If only one dataset can be fetched, a ratio below 1.0 still refutes; a pass or an intermediate result on the single dataset is MIXED, because support requires both experiments. If both fetches fail, the verdict is inconclusive (data-unavailable). Any other outcome in which at least one dataset qualifies is MIXED. Animals are untested.";
<https://w3id.org/delphi/ontology/hasConfidence> "0.64"^^xsd:double;
<https://w3id.org/delphi/ontology/hasEvidence> <https://w3id.org/delphi/resource/evidence/darwin1859-ch04-20--claim-test--dataset-1>,
<https://w3id.org/delphi/resource/evidence/darwin1859-ch04-20--claim-test--dataset-2>;
<https://w3id.org/delphi/ontology/hasVerdict> "mixed";
<https://w3id.org/delphi/ontology/hypothesis> "In a plant biodiversity experiment, plots sown with more species produce more aboveground biomass, and the highest sown richness produces at least half again as much biomass as monocultures.";
<https://w3id.org/delphi/ontology/inferenceMethod> "Within each experiment, divide mean biomass at the highest sown richness by mean biomass of sown monocultures, and compute the Spearman correlation of sown richness and biomass. Years are summarized by the median when a file has several years. Support requires ratio >= 1.50 and a positive Spearman p < 0.01 in both experiments. Ratio < 1 in either experiment refutes.";
<https://w3id.org/delphi/ontology/passCriterion> "Pre-registered, before opening either biomass table. Scope is plant plots only. Amount of life is aboveground community plant biomass per plot. Diversification of structure is the experimentally assigned number of sown species, not a trait index; if a file has no assigned sown-richness column the dataset does not qualify. Functional-group counts are reported when a column exists and do not decide the verdict. Datasets: Jena Experiment main experiment, year 2002, PANGAEA 10.1594/PANGAEA.846320; Cedar Creek Biodiversity II (E120) plant aboveground biomass, EDI package knb-lter-cdr.273.12, DataCite DOI 10.6073/pasta/87b179ac496a0343e6860b19f33158fc. If a table is species-level, biomass is summed to plot (and year, if a year column exists) before the test. All plots are used. For a dataset with one year, ratio = mean biomass at the highest sown richness divided by mean biomass at sown richness 1, and rho is the Spearman correlation of sown richness and biomass. For a dataset with several years, the ratio and the Spearman rho are computed inside each year that has at least 8 plots at richness 1 and at least 8 plots at that year's highest richness, and the dataset's ratio and rho are the medians of those yearly values. A dataset passes if its ratio is at least 1.50 and its Spearman rho is positive with two-sided p below 0.01. SUPPORTS only if both datasets qualify and both pass.";
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dc:license "CC BY 3.0";
<http://www.w3.org/2000/01/rdf-schema#label> "Dataset: Aboveground community and species-specific plant biomass from the Jena Experiment (Main Experiment, year 2002)";
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dc:description "species-sorted aboveground biomass and sown species number, 1996-2021";
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<http://www.w3.org/2000/01/rdf-schema#label> "Dataset: Plant aboveground biomass data: Biodiversity II (E120), Cedar Creek LTER";
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