Extended Data Figure 4: Sensitivity analyses of historical trends from 1978 to 2007 in nectar productivity and species diversity with alternative data sets.
From: Historical nectar assessment reveals the fall and rise of floral resources in Britain
a, b, Box plots of log10 (x + 1) nectar productivity (a) and box plots of species nectar diversity per habitat (b) based on vegetation data for 1978, 1990, 1998 and 2007 discounting the contribution of grazed white clover in improved grassland. c, d, Box plots of log10 (x + 1) nectar productivity (c) and box plots of species nectar diversity per habitat (d), based on vegetation data for 1978, 1990, 1998 and 2007 and computed with the alternative rectangular phenology function. e, f, Box plots of log10 (x + 1) nectar productivity (e) and box plots of species nectar diversity per habitat (f), based on vegetation data for 1978, 1990, 1998 and 2007 and computed considering only the species with empirical nectar values. Significant differences of time periods per habitat are indicated by asterisks (*P ≤ 0.05; **P ≤ 0.01; ***P ≤ 0.001). See Supplementary Table 3 for sample sizes and Supplementary Information for details. See ‘Statistical analyses’ section of the Methods for detailed statistical methods and definition of box plot elements.
