Depth ranges of four stony coral species
| Species | Location | Minimum depth (meters) | Maximum depth (meters) |
|---|---|---|---|
| Acropora awi | Indo-Pacific | 0 | 5 |
| Indophyllia macassarensis | Indo-Pacific | 20 | 25 |
| Isophyllia rigida | Caribbean | 3 | 20 |
| Scolymia cubensis | Caribbean | 10 | 92 |
A marine biologist is researching four stony coral species in Caribbean and Indo-Pacific waters. The biologist classifies the water column into two zones based on depth below the surface: the shallow zone (less than 30 meters) and the mesophotic zone (30 meters or more). To study a group whose every recorded sighting falls entirely within the shallow zone, the biologist should focus on sightings of species found in __________