Currently, a 30 m depth limit, based on SCUBA regulations, separates shallow and deep
mesophotic coral ecosystems (MCE s). This definition, however, fails to explicitly
accommodate environmental variation. Here, we posit a novel definition for a regional or
reef‐to‐reef outlook of MCE s based on the light vs. coral community–structure relationship.
A combination of physical and ecological methods enabled us to clarify the ambiguity in …