Extended Data Table 2 Acceleration of the increase in species richness over time

From: Accelerated increase in plant species richness on mountain summits is linked to warming

  1. Linear mixed effects models (Gaussian family error distribution) showed an acceleration of the increase in species richness over time (ΔSR/∆t ~ t). Different random effect structures were implemented. The species richness from the summit’s first survey and the number of years between two consecutive observations (period) were included as additional explanatory variables. The lower panel further includes a breakpoint in the relationship between rate of richness change and time. The breakpoint was fitted independently by minimizing model deviance and was estimated for the year 1971. All models were based on 396 observations (comparison of survey and resurveys). Significant effects are indicated by asterisks (*P < 0.05, **P < 0.01, ***P < 0.001; P values > 0.001 are additionally reported in brackets). Note that models without random structure performed best.
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