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Table 6 Growth models of silver fir on Mont-Ventoux, France, following comparisons of growth between infected (N = 14) and uninfected trees (N = 6) using Student’s t test (p < 0.05)

From: Individual vulnerability factors of Silver fir (Abies alba Mill.) to parasitism by two contrasting biotic agents: mistletoe (Viscum album L. ssp. abietis) and bark beetles (Coleoptera: Curculionidae: Scolytinae) during a decline process

 

Model 1964–1996

Student’s t test 1997–2007

Tree

Class

Infection year

R 2

F

p

 

t

df

p

 

BAIm

BAIs

TC4_S7

0

–

0.480

4.70

0.00147

**

3.15

19.9

0.00498

*

839

650

TC12_S6

0

–

0.429

5.00

0.00158

**

1.88

19.9

NS

NS

740

526

TC13_S12

0

–

0.332

3.27

0.0131

*

−1.42

16.7

NS

NS

231

251

TC15_S13

0

–

0.451

7.57

<0.001

***

2.04

12.5

NS

NS

693

457

TCR14

0

–

0.594

4.89

0.00346

**

2.50

13.2

0.0262

*

556

403

TCR49

0

–

0.952

62.2

<0.001

***

3.19

10.2

0.00931

**

2,600

412

TCR58

1

1997

0.235

4.27

0.0129

*

−0.28

14.4

NS

NS

735

765

TC8_S3

1

1997

0.0900

2.61

NS

NS

–

–

–

–

–

–

TC3_S17

1

1999

0.375

7.40

0.000793

**

−1.39

18.8

NS

NS

677

778

TC1_S7

1

2001

0.859

25.4

<0.001

***

3.41

18.6

0.00299

**

814

710

TC7_S8

1

2001

0.402

3.15

0.0118

*

6.72

19.8

<0.001

***

816

205

TCR16

1

2002

0.376

5.83

0.00153

**

−4.71

11.2

0.000600

**

1,426

2,504

TCR45

1

2004

0.583

9.95

<0.001

***

−2.94

12.9

0.0114

*

515

727

TCR38

2

1997

0.579

7.31

<0.001

***

−5.81

19.9

<0.001

***

2,262

3,284

TCR5

2

1997

0.868

31.0

<0.001

***

−4.42

10.7

0.00110

**

1,774

3,844

TC3_S10

2

2001

0.539

5.16

0.000702

**

1.11

19.7

NS

NS

846

740

TC4_S11

2

2001

0.407

8.32

<0.001

***

3.11

17.8

0.00613

*

995

805

TC15_S1

3

1992

0.367

5.63

0.00186

**

3.80

16.5

0.00148

**

2,048

1,363

TCR13

3

1996

0.331

4.97

0.00373

**

−0.813

11.8

NS

NS

1,560

1,774

TCR6

3

2000

0.822

19.5

<0.001

***

−0.770

16.5

NS

NS

979

1,037

  1. For each tree, BAIm and BAIs were the mean value of observed and simulated growth, respectively. For each tree, class was the infection level (class 0 = absence of mistletoe, class 1 = low infection, class 2 = moderate infection, class 3 = strong infection) and infection year was the starting year of mistletoe infection
  2. NS non-significant
  3. *p < 0.05, **p < 0.01, ***p < 0.001