TABLE 7.
Mantel regressions for associations between pairwiseFST and explanatory variables on the two islands with the highest number ofD. longispina pools (Granbusken, 14 pools; Storgrundet, 12 pools)
| Explanatory variable | Island | Test statistic |
Value |
|---|---|---|---|
| Mean age | Granbusken | r | −0.46*** |
| Storgrundet | r | −0.30* | |
| Combined | χ2 | 26.96**** | |
| Mean volume | Granbusken | r | −0.18 |
| Storgrundet | r | −0.43*** | |
| Combined | χ2 | 22.07*** | |
| Distance | Granbusken | r | 0.22* |
| Storgrundet | r | 0.41*** | |
| Combined | χ2 | 21.25*** |
Combined tests were calculated according to Fisher's method of combining probabilities. The Mantel r-values from simple regression are given. The underlined values are also significant (P < 0.05) in a multiple regression after correcting for all other factors.