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Table 11 Effects of environmental variables and species traits on species composition obtained in steps of double constrained correspondence analysis

From: Diversity and composition of moss guilds on uprooted trees in Central European mountain forests: effects of uprooting components and environmental variables

 

Explained variation %

F

p

Step 1 of dc-CA: CCA constraining species composition by environmental variables

Simple term effects

   

LF

6.9

16.3

0.002

Elevation

5.5

12.8

0.002

CVP

4.6

10.6

0.002

Age

1.8

4

0.002

P

1.8

3.9

0.002

PA-PF

1.5

3.3

0.002

Size

1.4

3.1

0.006

Canopy

1.1

2.4

0.004

R

1

2.3

0.004

AP

1

2.2

0.004

M

0.6

1.3

0.138

Conditional term effects

   

LF

6.92

16.3

0.002

CVP

2.18

5.2

0.002

P

1.58

3.8

0.002

Age

1.3

3.2

0.002

Canopy

0.85

2.1

0.016

Elevation

0.73

1.8

0.012

PA-PF

0.58

1.4

0.114

Size

0.43

1.1

0.338

M

0.36

0.9

0.604

Step 3 of dc-CA: CCA constraining transposed species composition table by functional traits

Simple term effects

   

Perennials

7.2

1.8

0.002

Light preferences

6

1.5

0.002

Colonists

4.9

1.2

0.166

Long-lived shuttles

4.6

1.1

0.22

Moisture preferences

3.6

0.9

0.694

Orthotropic

3.4

0.8

0.734

Plagiotropic

3.4

0.8

0.742

Conditional term effects

   

Perennials

7.2

1.8

0.002

Light preferences

5.3

1.3

0.044

Long-lived shuttles

4.8

1.2

0.164

Colonists

4

1

0.3

Orthotropic

3.8

1

0.438

Moisture preferences

3.7

0.9

0.598

  1. Explanations: F, p values of statistics obtained in Monte Carlo permutation test, R root plates, P pits, M mounds; forest communities: AP Abieti-Piceetum abietis, PA-PF plantations of spruce Picea abies in the lower montane forest belt, CVP Calamagrostio villosae-Piceetum abietis, LF Luzulo luzuloidis-Fagetum; Elevation altitude above sea level, Age age of uprooted trees, Canopy cover of tree crowns, Size size of the components of RPM complexes, Conditional term effects the effects of the correlated variables, Simple term effects the effects of the separate variables