Table 4. Variance partitioning resulting from the partial canonical analyses of ecological and socioeconomical variables on species richness; data are for Tierra Colorada.
 
Fraction of variation

Proportion of variation

F ratio

df

P


Ecological (a + b)

0.510

5.27

3,26

0.004

Socioeconomical (b + c)

0.710

10.27

4,26

0.001

Total variation

0.811

8.12

9,26

0.001

Fraction decomposed





Ecol. not explained by soc. (a)

0.101

2.27

4,17

n.s.

Soc. explained by ecol. (b)

0.409




Soc. not explained by ecol. (c)

0.301

5.42

5,17

0.01

Unexplained variation (d)

0.189



 
Notes: Three RDAs serve as the basis for the present table. The ecological variation (a + b) was obtained by RDA with ecological variables only, whereas the socioeconomical variation (b + c) was obtained by RDA with socioeconomical variables only. Total variation (a + b + c) was obtained by a joined RDA with ecological and socioeconomic variables. The fractions of variations are then decomposed arithmetically to isolate the effect of the strictly ecological and socioeconomical variation.
