Why is the Philippines the center of marine biodiversity?

The Verde Island Passage holds the highest density of marine species on Earth — 605 coral species versus 410 on the Great Barrier Reef, and roughly 1,700 fish species.

Do marine protected areas actually work?

Yes. Protected reefs show 4 to 5 times the fish biomass of fished reefs within about five years (Russ & Alcala, Apo Island).

Verde Island Passage

The center of the center of marine biodiversity.

More coral species than any reef on Earth. Crank the pressures on the right and watch this stretch of sea bleach, empty, and crumble — then bring it back.

Coral species present

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Living reef cover

— %

Fish biomass

— %

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reef health · drag the sliders

Pressures on the reef

Bleaching events / decade2

Marine heatwaves expel the algae corals live on. Pre-industrial reefs saw one every ~25 years; warming has pushed the Coral Triangle toward several per decade.

Destructive fishing15% of reefs

Dynamite and cyanide. Each blast kills everything in a ~15 m radius and the reef structure with it — 5+ years to regrow.

MPA coverage3%

No-take marine protected areas. PH commits to 10% by 2030 (Aichi Target 11). Today it sits near 3%.

What protection buys—×

Fished

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Protected

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Fish biomass after ~5 years, inside vs outside a no-take zone. Apo Island reached 4–5×.

How to read this

Drag bleaching events, destructive fishing, and MPA coverage. The reef on the left responds live — corals lose colour and shrink, fish thin out, the water clouds. The cards track coral species present, living cover, and fish biomass. Protection is the only lever that pushes health up.

Why the PH is the center of marine biodiversity

The Verde Island Passage between Mindoro and Batangas has the highest density of marine species per unit area on Earth — about 60% richer than the Great Barrier Reef.

605 coral species here versus 410 on the GBR. Roughly 1,700 fish species. The Philippines is the spawning heart that seeds the rest of the Coral Triangle.

The destruction tools

Blast fishing: kills everything in a 15 m radius and kills the reef itself. Used in ~15% of PH coastal areas. Each blast = 5+ years of recovery.

Cyanide: stuns reef fish for the aquarium trade. Coral polyps die on contact. The live trade is worth ~$50M/yr to coastal villages.

MPAs work: protected reefs show 4–5× the fish biomass of fished reefs after five years.

Citations

Carpenter & Springer (2005) — "The center of the center of marine biodiversity," Env. Biol. Fishes 72, 467.
Veron et al. (2009) — Coral Triangle delineation, Galaxea 11, 91.
Burke et al. (2012) — Reefs at Risk Revisited, WRI.
Russ & Alcala (2010) — Apo Island MPA recovery, Ecol. Appl. 20, 1610.
BFAR (2023) — Philippine fisheries profile, dynamite/cyanide use estimates.

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