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https://w3id.org/sciencelive/np/RAybO8c8qx0p5bz9lMhMxzNsXhp0aXyd8GHnGC3i53vQY/soroye2020-iberian-bombus-cea-and-healpix-nside64
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TEI mechanism replicated on Iberian Bombus — CEA grid + HEALPix nside=64 substrate extension
https://w3id.org/sciencelive/np/RAybO8c8qx0p5bz9lMhMxzNsXhp0aXyd8GHnGC3i53vQY/soroye2020-iberian-bombus-cea-and-healpix-nside64
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1. Pixelisation. Soroye 2020 fit at the CEA grid (~100 km, equal-area cylindrical projection at the equator). This Study additionally fits at HEALPix-NESTED nside=64 (~92 km cells on the WGS84 ellipsoid). Cell area is comparable (within ~10%); cell shape and topology differ.
2. Region. Soroye 2020 fit on North America + whole Europe (all Western Palearctic Bombus). This Study fits on Iberian peninsula only. Iberia is a subset of Soroye's European fitting domain; the same GLMM specification applies.
3. Inference engine. Soroye 2020 used MCMCglmm (R). This Study uses two independent Python implementations (statsmodels variational-Bayes for the fast first pass; bambi/PyMC NUTS for the authoritative posterior HDIs reported in the Outcome). Both target the same Bayesian posterior.
4. Prior choices. Soroye 2020's MCMCglmm priors (default informative inverse-Wishart on variance components) are not exactly reproducible across to bambi (Half-StudentT default on group SDs). This is the largest non-trivial methodological deviation; it should not affect the headline coefficient sign or order of magnitude (verified: it does not). The full prior table is in notebooks/03h_analysis_healpix.py.
5. Climate inputs. Soroye 2020's CRU TS 3.24.01 from his Figshare deposit is used unchanged — NOT a deviation, this is the SAME climate dataset.
6. Sampling-effort proxy. Same as Soroye (cells_per_decade × records_per_cell from the cleaned occurrence table) — NOT a deviation.
https://w3id.org/sciencelive/np/RAybO8c8qx0p5bz9lMhMxzNsXhp0aXyd8GHnGC3i53vQY/soroye2020-iberian-bombus-cea-and-healpix-nside64
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METHOD
Tier 1 — historical fit.
(1) Climate inputs. Soroye's bundled CRU TS 3.24.01 NetCDFs (mean monthly temperature and total monthly precipitation, 1901–2014, 0.5° lat-lon grid) are downloaded from Soroye's Figshare deposit and used unchanged. No substitution with cdsapi or other reanalysis sources at fit time — by design, to keep the climate forcing identical to the original.
(2) Occurrence inputs. GBIF Iberian Bombus occurrences are issued via own-DOI download (cited in the Outcome step 05 "evidence" field). Filtering follows Soroye's species list (genus Bombus, valid taxonomy, occurrences geo-referenced to the Iberian peninsula bounding box).
(3) GLMM specification. Replicates Soroye's exact formula:
extinction ~ continent + sc_sampling + sc_TEI_bs + sc_TEI_delta + sc_TEI_bs:sc_TEI_delta + sc_PEI_bs + sc_PEI_delta + sc_PEI_bs:sc_PEI_delta + sc_TEI_bs:sc_PEI_bs + sc_TEI_delta:sc_PEI_delta + (1|species)
where TEI = (T_obs − T_min_spp) / (T_max_spp − T_min_spp), PEI is the analogous precipitation index, and sc_ is within-substrate z-scoring.
(4) Two spatial substrates.
Pass 1 (CEA): cell coverage and per-species niche limits computed on Soroye's original CEA grid (~100 km cells); GLMM fit on this grid.
Pass 2 (HEALPix nside=64): cell coverage re-computed on HEALPix-NESTED nside=64 cells of the WGS84 ellipsoid (using the healpix-geo Python library); per-species niche limits and the GLMM are refit at this substrate.
(5) Inference. Two independent fitting strategies on the same Pass-2 design matrix:
(a) variational-Bayes mean-field via statsmodels.BinomialBayesMixedGLM (fast first pass);
(b) full-posterior NUTS via bambi/PyMC, 4 chains × 2000 samples (authoritative HDIs).
Tier 2 — SSP3-7.0 future projection — runs on the DestinE Jupyter platform and is part of this same chain's Outcome (step 05), not a separate Study. Briefly: DestinE Climate DT IFS-NEMO standard SSP3-7.0 GRIB files are retrieved via polytope on LUMI for the 2020–2029 and 2030–2039 horizons, decoded with eccodes (Python API, NESTED-aware), subset to pre-computed Iberian HEALPix cells, aggregated to monthly means matching the CRU TS units, and used to compute future TEI_delta and PEI_delta per species per cell. Per-species ranking is reported following the protocol established in the methodological sibling chain.
Code: notebooks/01_data_download.py (CRU TS + GBIF), notebooks/02_data_clean.py (CEA Pass 1 cleaning), notebooks/02h_data_clean_healpix.py (HEALPix Pass 2 cleaning), notebooks/03_analysis.py (CEA fit), notebooks/03h_analysis_healpix.py (HEALPix fit), notebooks/04_figures.py + 04h_figures_healpix.py (figures).
https://w3id.org/sciencelive/np/RAybO8c8qx0p5bz9lMhMxzNsXhp0aXyd8GHnGC3i53vQY/soroye2020-iberian-bombus-cea-and-healpix-nside64
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SCOPE: the GLMM coefficient on standardised TEI_delta (Soroye et al. 2020's "climatic position index change" between baseline 1901–1974 and recent 2000–2014), restricted to Bombus species observed on the Iberian peninsula in GBIF.
IN SCOPE
- Soroye 2020's GLMM specification: extinction ~ continent + sc_sampling + sc_TEI_bs + sc_TEI_delta + sc_PEI_bs + sc_PEI_delta + (TEI:PEI interactions) + (1|species).
- Soroye 2020's CRU TS 3.24.01 climate inputs (Figshare bundle, identical NetCDFs).
- Two spatial substrates: original CEA grid (~100 km cells, Pass 1) and HEALPix-NESTED nside=64 on the WGS84 ellipsoid (~92 km cells, Pass 2).
- Tier 1 historical fit on the 1901–1974 baseline period and 2000–2014 recent period.
OUT OF SCOPE for this Replication Study (handled by separate chains)
- Higher-resolution substrates (HEALPix nside=128) — see weatherxbiodiversity-projection-nside128.
- Cross-substrate methodological diagnostic (substrate-coupling at projection time) — see weatherxbiodiversity-substrate-sensitivity.
- Tier 2 SSP3-7.0 future projection — reported as a separate Outcome contribution within this same chain (see step 05), not as a separate Study.
- Bombus species outside the Iberian peninsula (Soroye's original ranges in North America + whole-Europe).
https://w3id.org/sciencelive/np/RAybO8c8qx0p5bz9lMhMxzNsXhp0aXyd8GHnGC3i53vQY/soroye2020-iberian-bombus-cea-and-healpix-nside64
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Anne Fouilloux
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2026-05-11T18:27:02.619Z
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TEI mechanism replicated on Iberian Bombus — CEA grid + HEALPix nside=64 substrate extension
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