Table 4 Location of optimum (μ), predicted maximum probability of occurrence (h) and niche amplitude based on 2t tolerances, for species with unimodal response with respect to %G of Pinus pinaster, as well as the frequency of species appearance in the plots (%)

Agrostis castellana Boiss. and Reut

IV

2.83

36.68

66.94

70.59

Aira caryophyllea L.

IV

4.61

31.97

9.03

41.18

Deschampsia flexuosa (L.) Trin.

V

3.76

72.89

58.75

41.18

Erica arborea L.

IV

6.48

34.46

43.25

23.53

Erica australis L.

V

24.10

78.97

43.50

82.35

Hypnum spp.

V

18.58

19.47

42.55

94.12

Juniperus oxycedrus L.

IV

10.74

6.37

3.21

11.76

Potentilla montana Brot.

IV

4.79

29.86

36.93

52.94

Pteridium aquilinum (L.) Kuhn

IV

9.28

18.02

13.95

29.41

Quercus pyrenaica Willd.

IV

4.08

40.93

60.88

29.41