Ecological Archives E094-250-A3

Brian J. Spiesman, Brian D. Inouye. 2013. Habitat loss alters the architecture of plant–pollinator interaction networks. Ecology 94:2688–2696. http://dx.doi.org/10.1890/13-0977.1

Appendix C. Supplementary structural-equation model results.

Table C1. Unstandardized/standardized path coefficients and covariance/correlations. Bias is the difference between the original estimate and the mean of bootstrap estimates. P is the bias-corrected P value indicating the significance of the original estimate as derived from the bootstrapping process.

 

Unstandardized Path Coefficients

 

Standardized Path Coefficients

Path

Original Estimate

Mean of Bootstrap Estimates

Bias

SE mean bootstrap

SE Bias

P

 

Original Estimate

Mean of Bootstrap Estimates

Bias

SE mean bootstrap

SE Bias

P

Habitat amount → Richness

52.2356

52.3528

0.1172

13.4412

0.1344

<0.0001

 

0.7136

0.6988

-0.0148

0.1453

0.0015

0.0012

Habitat amount → Abundance

621.0377

621.7267

0.6890

274.0459

2.7405

0.0108

 

0.5069

0.4967

-0.0101

0.1976

0.0020

0.0351

Canopy → Richness

-64.1618

-64.2926

-0.1308

28.1593

0.2816

0.0104

 

-0.4125

-0.4125

0.0001

0.1784

0.0018

0.0322

Canopy → Abundance

-1312.306

-1316.679

-4.3734

587.9161

5.8792

0.0112

 

-0.5041

-0.4948

0.0093

0.1991

0.0020

0.0357

Richness → Connectance

-0.0009

-0.0009

0.0000

0.0002

0.0000

<0.0001

 

-0.7705

-0.7629

0.0077

0.1206

0.0012

0.0026

Richness → Nestedness

0.3904

0.3903

-0.0001

0.0769

0.0008

<0.0001

 

1.8437

1.8756

0.0319

0.4288

0.0043

0.0002

Richness → Modularity

-0.5177

-0.5173

0.0004

0.0931

0.0009

<0.0001

 

-1.8019

-1.8014

0.0005

0.3527

0.0035

0.0001

Abundance → Nestedness

-0.0137

-0.0317

0.0000

0.0035

0.0000

<0.0001

 

-1.0795

-1.0983

-0.0187

0.3154

0.0032

0.0012

Abundance → Modularity

0.0112

0.0112

0.0000

0.0042

0.0000

<0.0001

 

0.6513

0.6561

0.0048

0.2581

0.0026

0.0101

Composition → Modularity

-5.1722

-5.1923

-0.0201

3.0883

0.0309

0.0211

 

-0.2221

-0.2275

-0.0054

0.1379

0.0014

0.0909

Connectance → Nestedness

182.7264

182.3673

-0.3591

46.5890

0.4659

<0.0001

 

0.9576

-0.9681

0.0105

0.2761

0.0028

0.0009

Connectance → Modularity

-214.2098

-213.0318

1.1779

59.0728

0.5907

<0.0001

 

-0.8274

-0.8278

-0.0004

0.2680

0.0027

0.0009

 

Covariance

 

Correlation

Richness ↔ Abundance

1614.436

1264.183

-350.252

696.195

6.9620

0.0004

 

0.6432

0.6250

-0.0182

0.1944

0.0019

0.0313

Nestedness ↔ Modularity

-2.1143

-1.5138

0.6004

1.0614

0.0106

0.0027

 

-0.5328

-0.5291

0.0037

0.2636

0.0026

0.1887

 

Table C2. Matrices of standardized total (A) and indirect (B) effects.

A. Standardized Total Effects

 

Habitat amt.

Canopy

Richness

Abundance

Composition

Connectance

Richness

0.7136**

-0.4125*

 

 

   

Abundance

0.5069*

-0.5041*

 

 

   

Connectance

-0.5498**

0.3179*

-0.7705**

 

   

Modularity

-0.5007*

0.1520

-1.1643**

0.6513*

-0.2221°

-0.8247***

Nestedness

0.2419

0.0880

1.1058**

-1.0795**

 

0.9576***

 

 

B. Standardized Indirect Effects

 

Habitat amt.

Canopy

Richness

Abundance

Composition

Connectance

Richness

     

 

   

Abundance

     

 

   

Connectance

-0.5498**

0.3179*

 

 

   

Modularity

-0.5007*

0.1520

-1.1643**

 

   

Nestedness

0.2419

0.0880

1.1058**

 

   

Bootstrapped P values: ° < 0.1, * < 0.05, ** < 0.01, *** < 0.001


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