Ecological Archives E096036A3
Adrienne L. Godschalx, Martin Schädler, Julie A. Trisel, Mehmet A. Balkan, and Daniel J. Ballhorn. 2015. Ants are less attracted to the extrafloral nectar of plants with symbiotic, nitrogenfixing rhizobia. Ecology 96:348–354. http://dx.doi.org/10.1890/141178.1
Appendix C. Results of structural equation models.
Table C1. Results of structural equation models. The effects of rhizobia on aboveground plant traits and ant attraction according are shown. Arrows indicate the direction of the effect. Given are the unstandardized path coefficients (estimates), covariances, standard error of regression weights and covariances (SE), the critical values for regression weights and covariances (CR), the levels of significance (P) and information on model fit (χ^{2}, AIC, RMSA).
Variables 
Estimate 
SE 
CR 
P 

Regression weights 


Shoot biomass 
← 
Rhizobia 
33.284 
4.248 
7.836 
< 0.001 
Proteins 
← 
Rhizobia 
16.615 
2.948 
5.637 
< 0.001 
HCN 
← 
Rhizobia 
15.507 
3.212 
5.450 
< 0.001 
EFN 
← 
Rhizobia 
1.100 
0.174 
6.430 
< 0.001 
Ants 
← 
EFN 
1.506 
0.229 
6.567 
< 0.001 
Covariances 


HCN 
↔ 
Proteins 
27.44 
15.781 
1.739 
0.082 
HCN 
↔ 
Shoot biomass 
41.346 
22.802 
1.813 
0.070 
Proteins 
↔ 
Shoot biomass 
70.114 
22.463 
3.121 
0.002 







χ2 = 3.71, df = 7, p = 0.81 


AIC = 31.71 


RMSA < 0.001 