Table 1.
Results from multiple phylogenetic generalized least squares (PGLS) analyses with holoploid genome size (1C: Mbp) as the response variable
| Predictor variable(s) | logLik | Estimate | s.e. | t-value | R 2 adj | AIC | delta AIC | AICw | P |
P
(corrected) |
|---|---|---|---|---|---|---|---|---|---|---|
| Prec_dry_month | –224.93 | 0.03 | 0.01 | 2.42 | 0.01 | 453.87 | 0 | 0.31 | 0.02 | 0.17 |
| EOO | –225.42 | –0.02 | 0.01 | –2.22 | 0.01 | 454.83 | 0.96 | 0.19 | 0.03 | 0.17 |
| Prec_cold_quarter | –225.63 | 0.01 | 0 | 2.11 | 0.01 | 455.27 | 1.40 | 0.15 | 0.04 | 0.17 |
| Prec_ann | –226.31 | 0.09 | 0.05 | 1.77 | 0 | 456.61 | 2.75 | 0.08 | 0.08 | 0.26 |
| SOC | –226.64 | 0.06 | 0.04 | 1.56 | 0 | 457.29 | 3.42 | 0.06 | 0.12 | 0.28 |
| Latitude | –226.72 | 0.03 | 0.02 | 1.51 | 0 | 457.44 | 3.57 | 0.05 | 0.13 | 0.28 |
| Intercept | –227.87 | NA | NA | NA | 0 | 457.73 | 3.87 | 0.04 | NA | NA |
| Diurnal_range | –227.36 | –0.09 | 0.08 | –1.01 | 0 | 458.72 | 4.85 | 0.03 | 0.31 | 0.58 |
| pH | –227.62 | –0.15 | 0.22 | –0.7 | 0 | 459.24 | 5.37 | 0.02 | 0.48 | 0.69 |
| P | –227.85 | –0.01 | 0.06 | –0.15 | 0 | 459.71 | 5.84 | 0.02 | 0.88 | 0.98 |
| Temp_ range |
–227.85 | –0.01 | 0.07 | –0.16 | 0 | 459.71 | 5.84 | 0.02 | 0.88 | 0.98 |
| Niche | –227.86 | 0 | 0.01 | –0.13 | 0 | 459.72 | 5.85 | 0.02 | 0.90 | 0.98 |
| Elevation | –227.46 | 0 | 0 | 0.90 | 0 | 458.92 | 5.05 | 0.02 | 0.37 | 0.60 |
Results are ranked in order of descending AICw values. Analyses were performed using the R package CAPER v.1.0.1 (Orme, 2013) and all variables were log transformed, except for Prec_dry_month, Prec_cold_quart, Niche, Latitude and Elevation, which were transformed by the square root. Lambda was fixed at 0.872. The following abbreviations are used to represent the environmental variables included in these analyses: pH (soil pH); ‘SOC’ (soil organic carbon); ‘P’ (available phosphorus); ‘Diurnal_range’ (mean diurnal air temperature range); ‘Temp_range’ (annual range of air temperature); ‘Prec_ann’ (annual precipitation); ‘Prec_dry_month’ (precipitation of the driest month); ‘Prec_cold_quart’ (precipitation of the coldest quarter); ‘EOO’ (extent of occurrence) and ‘Niche’ (niche size). Corrections for multiple comparisons were implemented using the method of Benjamini and Hochberg (1995), and the alpha value was set at 0.05. Only species with a minimum number of 25 observations were included in the analyses (494 observations retained).