Table 2.
Extent of geographical and environmental distance–decay relationships with host genetics and host microbiome data for Durvillaea antarctica and D. poha. Microbiome distance is based on weighted UniFrac to test for phylosymbiosis. Results are from generalized dissimilarity models. In both instances, geographical distance was removed because it explained zero deviance. Significance was assessed via 1000 random permutations. In some instances, P-values cannot be computed owing to insufficient variables to assess the relative importance of variables (indicated by a dash in parentheses). Predictor importance is assessed as the percentage change in deviance explained in models with and without the variable randomized. Nevertheless, the overall model significance is found in the percentage deviance explained column.
| Species | Model (predictor importance; P) | Percentage deviance explained (P) | Total deviance |
|---|---|---|---|
| Durvillaea poha | WuniFrac ~ Environment (–) | 15.44 (<0.001) | 60.8 |
| Genetics ~ Environment (–) | 30.27 (<0.001) | 163.3 | |
| WuniFrac ~ Genetics (0.09 %; <0.001) + Environment (99.03 %; <0.001) | 15.44 (<0.001) | 60.8 | |
| Durvillaea antarctica | WuniFrac ~ Environment (–) | 9.01 (<0.001) | 13.5 |
| Genetics ~ Environment (2.49 %; <0.001) + Geography (4.83 %; <0.001) | 85.38 (<0.001) | 162.5 | |
| WuniFrac ~ Genetics + Environment (–) | 7.13 (<0.001) | 13.5 |