Ecological Archives E087-028-A4

Denis Vile, Bill Shipley, and Eric Garnier. 2006. A structural equation model to integrate changes in functional strategies during old-field succession. Ecology 87:504–517.

Appendix D. Unstandardized path coefficients and intercepts of the structural equations, and unexplained (residual) variance of the variables (Error) of the model in Fig. 3. Parameters are given with their respective standard error (SE). R2 is part of variation explained (partial coefficient of multiple determination. SI = successional index, Field age = time since field abandonment, Vm1 = vegetative mass, Stm = stem mass at first seed dispersal, Lm = leaf mass at first seed dispersal, Rm = reproductive mass at first seed dispersal, H = maximum height, SLA = specific leaf area, Sn = number of seeds produced per individual per year, Sm = mean individual seed mass, Flowdate = flowering date of ~50% of plants in the population, Smatdate = date of seed maturation of ~50% of plants in the population.

Y

X

Coefficient

SE

Intercept

SE

Error

SE

R²

SI

Field age

1.000

 

-10.647

2.281

55.33

29.45

0.57

SLA

SI

-0.525

0.143

27.363

2.024

17.75

12.66

0.67

Vm1

SI

0.025

0.008

-0.348

0.117

0.19

0.07

0.30

Lifespan

SI

0.077

0.033

0.086

     

0.43

Lm

Plant size

0.739

0.180

-0.357

0.079

0.28

0.06

0.37

H

Plant size

3.535

0.679

6.952

0.202

1.36

0.73

0.74

Stm

Plant size

1.000

 

-0.009

0.050

0.004

0.027

 

Rm

Plant size

0.954

0.173

-0.045

0.130

0.02

0.07

0.94

 

Lifespan

-0.311

0.109

         

Plant size

Vm1

1.003

0.140

   

0.03

0.03

0.89

Sn

Sm

-0.708

0.158

2.833

0.167

0.35

0.20

0.67

 

Rm

0.993

0.359

         

Flowdate

Sm

-15.782

5.725

92.895

17.636

404

196

0.69

 

SI

1.529

0.678

         
 

H

6.127

3.029

         

Smatdate

Flowdate

1.123

0.220

31.843

32.886

425

208

0.80

Field age

         

72.72

36.18

 

Sm

         

0.79

0.27

 


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