Which factor is NOT related to reef erosion?

High water temperatures can lead to coral bleaching, a stress response that affects the health of coral reefs, but they are not directly associated with the erosion of the reef structure itself. Erosion primarily occurs due to physical and biological processes that break down the coral formations.

Physical breakage from storms contributes to reef erosion through strong waves and storm surges which physically damage coral structures. Predation involves organisms like damselfish or certain sea stars, which may consume coral polyps, gradually leading to the weakening and erosion of the reef. Exposure to air during low tides can lead to desiccation of corals, further compromising their health and structural integrity, thus promoting erosion.

In contrast, while high water temperatures affect coral viability and can indirectly contribute to reef degradation, they do not directly result in erosion like the other factors do.