CR

Montipora patula

Declining

Overview

Montipora patula, also called the sandpaper or ringed rice coral, is a coral species in the family Acroporidae endemic to Hawaii and is considered a vulnerable species.

Montipora patula faces severe population declines primarily due to ocean warming and acidification, which cause widespread coral bleaching and reduce the species' ability to build its calcium carbonate skeleton. The species is particularly vulnerable to marine heatwaves that have become increasingly frequent and intense across Pacific reef systems. Additional pressures from coastal development, sedimentation, and pollution further compromise remaining populations in shallow reef environments.

Threat summary

Habitat

Montipora patula inhabits shallow coral reef environments in the Indo-Pacific, typically found in lagoons and protected reef slopes at depths of 1-20 meters. The species forms plate-like colonies that require clear, warm waters with adequate light penetration for its symbiotic zooxanthellae.

Marine neritic· major

Conservation measures underway

Habitat & natural process restorationSpecies recoveryLegislation

Frequently asked questions

Why is Montipora patula classified as Critically Endangered?
Montipora patula is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Montipora patula faces severe population declines primarily due to ocean warming and acidification, which cause widespread coral bleaching and reduce the species' ability to build its calcium carbonate skeleton. The species is particularly vulnerable to marine heatwaves that have become increasingly frequent and intense across Pacific reef systems. Additional pressures from coastal development, sedimentation, and pollution further compromise remaining populations in shallow reef environments.
Where does Montipora patula live?
Montipora patula occurs in French Polynesia, Japan, Marshall Islands, U.S. Outlying Islands, and United States. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Montipora patula?
The main threats to Montipora patula are 11.1, 2.1, 5.4, and 6.1. The full IUCN-classified threat record for this species is detailed on the species page.

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