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OceansSeverity: Moderate

Coral reefs and marine biodiversity in Palawan

Palawan's reefs and mangroves are rich in biodiversity but face pressure from warming, destructive fishing and tourism.

Palawan · Philippines

01 · The problem

What is happening

Palawan lies at the edge of the Coral Triangle, the global centre of marine biodiversity. The Tubbataha Reefs Natural Park, a UNESCO World Heritage Site in the Sulu Sea, is a well-studied example of a well-protected, no-take reef. Elsewhere, reefs face pressure from marine heatwaves that cause coral bleaching, destructive fishing practices, sedimentation from land clearing and mining, and rapid tourism growth in destinations such as El Nido and Coron.

Moderate severity. Material effects on people or ecosystems; actively managed. Severity is descriptive editorial metadata summarising documented effects. It is not a measured index or a score.

02 · Causes

Why it is happening

  1. 01

    Marine heatwaves

    Elevated sea temperatures cause coral bleaching.

  2. 02

    Destructive fishing

    Blast and cyanide fishing damage reef structure and wildlife.

  3. 03

    Sediment and runoff

    Land clearing and mining send sediment onto nearshore reefs.

  4. 04

    Tourism pressure

    Boat traffic, anchoring and wastewater affect popular sites.

03 · Impacts

Who and what it affects

  1. 01

    Coral bleaching and mortality

    Repeated heat stress can kill corals and reduce reef complexity.

  2. 02

    Fisheries decline

    Damaged reefs support fewer fish, affecting food security.

  3. 03

    Loss of tourism value

    Degraded reefs reduce the attraction of dive and island destinations.

04 · Solutions

Documented approaches

  1. Marine protected areas

    Well-enforced no-take zones such as Tubbataha.

    Expected effectSupports fish biomass and reef resilience.

  2. Palawan's Strategic Environmental Plan

    A province-wide law establishing an environmentally critical areas network.

    Expected effectProvides a framework for zoning and conservation.

  3. Tourism carrying capacity limits

    Visitor caps, wastewater rules and managed access at popular sites.

    Expected effectReduces local pressure on reefs and lagoons.

Explore an illustrative What-If

05 · Key indicators

What can be measured

No reliable quantitative indicator is included for this issue. TerraLens shows figures only where a credible source supports them — consult the sources below for current data.

06 · Sources

Where this comes from

  1. [1]Tubbataha Reefs Natural Park — World Heritage ListUNESCO World Heritage Centrewhc.unesco.org(opens in a new tab)
  2. [2]Palawan Council for Sustainable DevelopmentGovernment of the Philippinespcsd.gov.ph(opens in a new tab)
  3. [3]Coral Reef WatchNOAAcoralreefwatch.noaa.gov(opens in a new tab)

Links open the publishing organisation's site. Some point to the publisher's main page, where the named report or dataset can be found.

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