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Randomization tests for phylogenetic conservatism of range limits (see text for details) in the NE Pacific bivalve genera with different levels of species richness. (Separate tests were performed for each range of species richness. The results are qualitatively the same for the W. Atlantic genera.)
| species richness | total number of genera | total number of species | p-value (north, south) |
|---|---|---|---|
| 2–4 | 147 | 380 | <0.001,<0.001 |
| 5–7 | 36 | 207 | <0.001,<0.001 |
| 8+ | 8 | 89 | <0.001, 0.001 |
