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).

From: Plant recording across two centuries reveals dramatic changes in species diversity of a Mediterranean archipelago

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

  1. 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.
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