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