About the Coral Triangle

The Coral Triangle is a marine region that spans those parts of Indonesia, Malaysia, Papua New Guinea, the Philippines, the Solomon Islands and Timor-Leste with at least 500 species of reef-building corals. The Coral Triangle encompasses portions of 2 biogeographic regions: the Indonesian-Philippines Region, and the Far Southwestern Pacific Region.

Coral Triangle biodiversity

Corals

• 76% (605) of the world’s coral species (798) are found in the Coral Triangle, the highest coral diversity in the world.
• The epicenter of that coral diversity is found in the Bird’s Head Peninsula of Indonesian Papua, which hosts 574 species (95% of the Coral Triangle, and 72% of the world’s total). Within the Bird’s Head Peninsula, the Raja Ampat archipelago is the world’s coral diversity bull’s eye with 553 species.
• The Coral Triangle has 15 regionally endemic coral species (species found nowhere else in the world), and shares 41 regional endemic species with Asia.

Coral reef fishes

 

• The Coral Triangle has more coral reef fish diversity than anywhere else in the world: 37% (2,228) of the world’s coral reef fish species (6,000), and 56% of the coral reef fishes in the Indo-Pacific region (4,050).
• 8% (235 species) of the coral reef fishes in the Coral Triangle are endemic or locally restricted species. Within the Coral Triangle, four areas have particularly high levels of endemism (Lesser Sunda Islands, Papua New Guinea – Solomon Islands, Bird’s Head Peninsula, and the Central Philippines).

Marine turtles

• 6 of the world's 7 marine turtle species, including the leatherback marine turtle, found in places such as the Northern Bird's Head Peninsula / Waigeo region, Papua (Indonesia), as well as Lea region (Papua New Guinea), New Georgia (Solomon Islands).

The Coral Triangle is defined by marine zones containing at least 500 species of reef-building coral—the darkest area that is roughly triangular in shape shown in the map above.

Certain neighbouring countries, including Australia and Fiji, contain rich coral biodiversity as well, but with somewhat lower numbers.

The main criteria used by scientists and conservationists to delineate the Coral Triangle were:

• High species biodiversity (more than 500 coral species, high biodiversity of reef fishes, foraminifera, fungid corals, and stomatopods) and habitat diversity
• Oceanography (currents)⁵

The Coral Triangle region is highlighted below in blue.


 

The Coral Triangle supports livelihoods and provides income and food security, particularly for coastal communities. Resources from the area directly sustain more than 120 million people living in the area.

The Coral Triangle’s economic value is nothing short of phenomenal:

• Tuna spawning and nursery grounds support a multi-billion dollar tuna industry and supply millions of consumers worldwide
• Marine resources contribute to a growing nature-based tourism industry, valued at over US$12 billion annually

The Coral Triangle is part of an area that has emerged as one of the planet’s economic hubs. Fast population and economic growth have fuelled unsustainable coastal development and boosted demand for expensive marine resources such as tuna, shark fin, turtle products and live reef fish.

Now, the challenge is to ensure that the growing needs of the region do not make the wonders of the Coral Triangle something of the past…