Extended Data Fig. 6: , Site-level (pollen record) estimates of millennial changes in diversity over three 1850 year periods over the Holocene: The early Holocene, mid Holocene and the Common Era, by European and North American biome.
From: Floristic diversity and its relationships with human land use varied regionally during the Holocene
a) turnover (Bray-Curtis), b) turnover (Jaccard), c) richness, d) evenness. Values computed for data-rich records (see Methods) by regressing each diversity measure onto age (calibrated years), extracting the slope coefficients and multiplying them by 1000 to give the expected linear change in diversity per millennium (on the log and logit scale for richness and evenness/turnover, respectively). Box and whiskers represent the cohort of pollen records from each biome. Biomes included depending on data inclusion criteria detailed in Methods. Box and whiskers represent the cohort of pollen records from each biome. Plots are zoomed in for clarity of presentation, but retain 95% of slope estimates. Solid boxes represent North American records, dashed boxes represent European records. In the following, ‘NA’ represents North America, ‘EU’ represents Europe, ‘EH’ represents Early Holocene, ‘MH’ represents Mid Holocene and ‘CE’ represents Common Era: NA Tundra, EH n = 149, MH n = 355, CE n = 209; EU Tundra, EH n = 148, MH n = 493, CE n = 186; NA Boreal forests/taiga, EH n = 217, MH n = 895, CE n = 405; EU Boreal forests/taiga, EH n = 111, MH n = 633, CE n = 415; NA temperate conifer forests, EH n = 666, MH n = 1,139, CE n = 1,125; EU temperate conifer forests, EH n = 1,058, MH n = 1,637, CE n = 813; NA temperate broadleaf and mixed forests, EH n = 1,119, MH n = 1,669, CE n = 1,886; EU temperate broadleaf and mixed forests, EH n = 2,043, MH n = 7,373, CE n = 7,535; NA temperate grasslands savannas and shrublands, EH n = 254, MH n = 386, CE n = 349; EU Mediterranean forests, woodland and scrub, EH n = 499, MH n = 1,131, CE n = 878.
