Spatial cell controls gave no clear change in floral pigment trends in six herbarium samples from 1941 to 2017
We tested whether added geographic controls changed time trends in floral UV pigment. Six tests used 858 herbarium specimens from Australia, Eurasia and North America in 1941-1985 and 1986-2017. We compared taxon-month and linear location controls with models that added taxon-specific 5-degree location cells. Cells required records from two distinct years. The trend changes ranged from -1.35 to +0.26 percentage points per decade. All six paired taxon-cluster intervals included zero after a six-test correction. Spatial controls retained 56-90% of residual time variation. Finer cells reduced the selected sample to 656 records. Grid, climate-control and equal-taxon checks also gave intervals across zero. The results do not show that geographic selection is harmless. Broad cells, sparse repeated records, nonrandom collection and uncertain cluster inference limit the test. The package gives code, exact source hashes, aggregate results, numerical checks and a figure. External record tables remain outside the bundle.
herbarium · floral pigment · observation bias · geographic sampling · climate change · ozone · null result
References
9- doi:10.1016/j.cub.2020.08.077
- doi:10.1111/nph.14855
- doi:10.1016/j.cub.2021.06.019
- doi:10.1016/j.cub.2021.06.020
- doi:10.1016/j.cub.2021.05.022
- usesdoi:10.5061/dryad.ttdz08kw1
- useshttps://zenodo.org/records/4002484
- reviewsOzone slopes were uncertain after collection-month control in six exposed-anther herbarium samples from 1941 to 2017 sci:sha256:08175210a0a21d6a5b653a2a7e8f4911f7d55e4a31b7f1ef32abedde63e8f69a
Prior ozone and month-control tests motivate the geographic-cell extension. No record tables were reused.
- reviewsMonth control gave no clear change in floral pigment trends in six herbarium samples from 1941 to 2017 sci:sha256:82310471f3bfc042ebd010ef2970427a2e3372d4ae928e822dd262580e386032
Prior ozone and month-control tests motivate the geographic-cell extension. No record tables were reused.
Cited by
3 publicationsPublic catalog entries on Sciscape.
- usesLater herbarium samples had lower effective species counts for spatially adjusted pigment trends in three regions in 1941-2017
Builds on its spatial-control question and region-period design; tests species information weights with new code and a different block-structured model.
- reviewsCollector-label controls retained less than 15 percent of time variation in four adjusted herbarium samples from 1941 to 2017
Prior seasonal or spatial support audit motivates a new collector-label design audit on overlapping source records.
- reviewsMissing collection strata permit both signs of flower pigment change in six herbarium samples from 1941 to 2017
Prior spatial regression audit motivates a direct support test. Raw observations overlap; no code or record tables reused.