Table 1.
Curve-fitting for the Island Species-Area Relationship (ISAR), based on the Arrhenius’ power function, calculated for plant species richness values of the Tuscan Archipelago islands (n = 16).
| Group of species | Year | Model fitting and parameters | |||
|---|---|---|---|---|---|
| c | z | Achieved convergence tolerance | F | ||
| Native plants | 1830–1950 | 252.2*** | 0.296*** | 2.00E-006 | 94364.8 |
| 1951–2015 | 229.3*** | 0.269*** | 7.97E-006 | 83223.3 | |
| Alien plants | 1830–1950 | 8.5*** | 0.332*** | 4.17E-006 | 397.1 |
| 1951–2015 | 24.4*** | 0.282*** | 9.03E-006 | 2660.4 | |
| Annual herbaceous plants | 1830–1950 | 136.9*** | 0.257*** | 3.48E-006 | 27054.8 |
| 1951–2015 | 122.3*** | 0.228*** | 8.15E-006 | 35458.3 | |
| Perennial herbaceous plants | 1830–1950 | 78.8*** | 0.359*** | 8.72E-006 | 17591.0 |
| 1951–2015 | 77.1*** | 0.328*** | 1.28E-006 | 14904.9 | |
| Woody plants | 1830–1950 | 43.2*** | 0.296*** | 1.61E-006 | 4010.6 |
| 1951–2015 | 51.2*** | 0.282*** | 2.13E-006 | 2462.6 | |
Parameters (c and z) of the ISAR models are shown as well as the achieved convergence tolerance and F-value. Separate models were calculated for different groups of species based on their origin (native and alien) and functional types (annual herbaceous, perennial herbaceous, and woody) and for each study period. Significance codes: ***p < 0.001; **p < 0.01; *p < 0.05.