Table 1.

Alternative path models that differ in the direction of causality between eusociality, genome size, and TE accumulation in Synalpheus snapping shrimps

We modeled social organization either categorically as eusocial vs. noneusocial species (pair-living and communal breeding combined) (n = 33) or continuously as the eusociality index (n = 29). Models 1 and 2 (in bold) were equally supported. C statistics summarize the P values from linear models that reflect the conditional independence statements. A path model was rejected if the P value of the C statistic was below 0.05, meaning that the hypothesized causal model did not provide a good fit to the data. CICc: a modified version of AIC for path models; GS: genome size; SOC: social organization; TE: abundance of transposable elements. Path coefficients and confidence intervals are reported in SI Appendix, Table S3. Significant paths are indicated by asterisks (black for models using eusocial vs. noneusocial classifications and gray for models using the eusociality index).