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Frequency distribution of lineage types of H. bivittatus in inshore channels with cold winter water versus offshore reefs with constant warm water.
| habitat type | n tropical lineage | n subtropical lineage |
|---|---|---|
| Florida inshore | 1 | 15 |
| Florida offshore | 16 | 4 |
| Bermuda inshore | 0 | 14 |
| Bermuda offshore | 6 | 6 |
