Mesophotic Coral Ecosystems - Summary

Depth in metres The mesophotic coral ecosystem

Shallow surface reefs

Approx. limit of most recreational scuba diving Shallow reefs dominated by scleractinian corals

30 m

“Upper”mesophotic coral ecosystems

60 m

90 m

Decrease in light intensity

120 m

“Lower”mesophotic coral ecosystems

Lower range for most research diving with mixed-gas equipment Upper range for most research using deep-diving vehicles

150 m

180 m

Source: Richard Pyle, unpublished data.

MCEs can form on high-angle continental and insular slopes as illustrated here, or on low-angle outer insular shelves and on the tops of submerged banks. Decreased light penetration rather than reduced temperature appears to be the primary limiting factor controlling the depth distribution of MCEs at most locations.