Table 2.
Asymptotic regression analyses of estimated species richness and diversity showing significant correlations.
| R2 | Adjusted R2 | AIC | logLik | L(χ2) | df | p-value | |
|---|---|---|---|---|---|---|---|
| Chao 1 species richness | |||||||
| nls(Chao1 ∼ SSasympOrig(moisture, Asym, lrc), data = alpha). | |||||||
| Current model | 0.4283 | 0.3875 | 240.00 | -117.00 | 8.947 | 1 | 0.00278 |
| Intercept model | 246.95 | -121.47 | |||||
| Shannon’s diversity index | |||||||
| gnls [Shannon ∼ SSasympOrig(moisture, Asym, lrc), data = alpha, control = gnlsControl(nlsTol = 0.05), weights = varPower(form = ∼ moisture)]. | |||||||
| Current model | 0.13 | 0.0679 | 34.70 | 6.7603 | -13.35 | 2 | 0.02748 |
| Intercept model | 37.89 | 2.5953 | -16.94 | ||||
AIC, Aikake information criterion; logLik, log likelihood; L(χ2), Chi-squared statistic.