Davao Oriental, Philippines — Coral reef ecosystems in Davao Oriental are facing serious ecological pressure, according to a new study published in the East Asian Journal of Multidisciplinary Research in 2026. Researchers found that most surveyed reef sites are in poor condition, marked by low live coral cover and increasing dominance of algae.
The study was conducted by Jefferson Centro, Ariel Eballe, France Guillian Rapiz, and Emily Antonio from Davao Oriental State University. Their findings provide critical insights into the health of marine ecosystems that support fisheries, biodiversity, and coastal livelihoods.
Coral reefs are among the most biologically diverse ecosystems on Earth, supporting nearly a quarter of all marine species despite covering less than one percent of the ocean floor. In the Philippines, part of the Coral Triangle, these ecosystems are essential for food security and economic stability. Yet they remain vulnerable to overfishing, pollution, coastal development, and climate-related disturbances.
The research surveyed seven reef communities across Davao Oriental: Banaybanay, Lupon, San Isidro, Baganga-Kinablangan, Baganga-Sauquegui, Cateel, and Bobon. Three of these areas are established Marine Protected Areas.
Using underwater photo-quadrat transects and visual fish census methods, the researchers measured benthic cover and reef fish populations. The assessment included hard corals, soft corals, seagrass, algae, dead coral, and abiotic substrates.
The results showed significant variation across locations. Live hard coral cover ranged from just 3.8 percent in Cateel to 60.3 percent in Baganga-Sauquegui. This made Baganga-Sauquegui the healthiest reef site in the survey, while Cateel ranked as the most degraded.
Several sites were dominated by algae and dead corals with algae, a strong sign of ecological stress and limited reef recovery. Lupon recorded the highest abiotic substrate at 55.6 percent, indicating severe habitat simplification.
Fish communities also varied sharply. Banaybanay recorded the highest fish abundance, with 1,964 individuals per 500 square meters, along with the highest biomass at 45.04 kilograms. In contrast, Baganga-Kinablangan showed the lowest fish biomass at 10.17 kilograms.
Interestingly, Baganga-Sauquegui, despite having the highest coral cover, recorded relatively lower fish abundance. The researchers suggest this may point to selective fishing pressure on economically valuable reef fish species.
According to the authors, coral health and fish population do not always move in the same direction. Other factors such as fishing intensity, food availability, and habitat quality also shape reef ecosystems.
The findings highlight that Marine Protected Areas alone may not guarantee ecosystem recovery without effective enforcement and strong community participation. Many reef systems in the Philippines continue to struggle despite conservation initiatives.
For coastal communities, reef degradation carries serious consequences. Declining coral health can reduce fish stocks, weaken coastal protection, and lower marine tourism potential.
The researchers say this study provides baseline ecological data that can help guide conservation policies, fisheries management, and long-term reef monitoring in Davao Oriental. They recommend stronger marine protection enforcement, habitat restoration, sedimentation control, and wider environmental education.
Ultimately, the study serves as a reminder that protecting coral reefs is not only about preserving biodiversity but also about securing the future of coastal economies and food systems.
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