Biodiversity on a Small Island: Why Taiwan Is a Global Hotspot

30-Second Overview

Taiwan occupies only 0.025% of Earth’s land area but has recorded more than 59,000 species of plants and animals—around 30% of them endemic. With 60% forest cover and a vertical gradient from sea level to the 3,952‑meter summit of Yushan (玉山), the island contains tropical, subtropical, temperate, and alpine ecosystems in one place. This makes Taiwan both a biodiversity “hotspot” and a living laboratory for island evolution.

Keywords: endemism, biodiversity hotspot, ecosystems, forest cover, conservation species

Why It Matters

Taiwan is a place where biodiversity becomes visible. The island’s species richness is not just a scientific fact; it is a reflection of geography and history. Isolation from the Asian mainland drove unique evolutionary paths, while steep mountains and shifting climates created a mosaic of habitats.

In the age of the sixth mass extinction, Taiwan’s biodiversity functions as a genetic reservoir with global significance. Endemic species such as the Formosan black bear (台灣黑熊), the Mikado pheasant (帝雉), and the leopard cat (石虎) embody evolutionary stories that exist nowhere else.

For Taiwanese society, biodiversity is also a form of cultural wealth. It shapes eco‑tourism, Indigenous knowledge systems, and the way people think about the island as home. Conservation here is not simply ecological—it is a question of identity and responsibility.

Geography and Climate: The Foundation of Diversity

A Crossroads Island

Taiwan sits where the Eurasian Plate meets the Philippine Sea Plate. The Tropic of Cancer cuts through the island, creating a climatic divide between north and south. The result is an ecological crossroads:

• Island isolation encourages speciation and endemism.
• Complex terrain (mountains, plains, coasts, and river valleys) creates many ecological niches.
• Vertical altitude zones compress multiple biomes into a short distance.
• Seasonal monsoons bring heavy rainfall and ecological disturbance that renews habitats.

Climate in Numbers

• Average annual temperature: about 25°C
• Average annual rainfall: over 2,500 mm (mountains can exceed 5,000 mm)
• Typhoon cycles: several per year, acting as ecological “reset” events that shape forest regeneration and species distribution

Forest Ecosystems and Altitude Zones

Taiwan’s forests cover more than 60% of the island. They are not uniform; they shift with elevation:

Tropical Rainforest Zone (0–500m)

• Southern lowlands
• Dominant species: Chinese banyan (榕樹), Sterculia (茄苳)

Subtropical Broadleaf Zone (500–1,500m)

• The most diverse forest layer
• Dominant species: camphor (樟樹), nanmu (楠木)

Temperate Mixed Forest Zone (1,500–2,500m)

• Home to giant conifers such as red cypress (紅檜) and Taiwan cypress (扁柏)

Subalpine Conifer Zone (2,500–3,500m)

• Cold‑adapted forests of Taiwan fir (台灣冷杉) and hemlock (台灣鐵杉)

Alpine Zone (above 3,500m)

• Dwarf shrubs and hardy plants like Yushan rhododendron (玉山杜鵑)

This vertical stratification is a major driver of Taiwan’s biodiversity density.

Animal Diversity: Endemic and Iconic Species

Mammals

Taiwan has around 80 mammal species, 29 of them endemic.

• Formosan black bear (台灣黑熊) — a conservation flagship facing habitat fragmentation.
• Formosan macaque (台灣獼猴) — Taiwan’s only native primate, often at the center of human‑wildlife conflict.
• Leopard cat (石虎) — Taiwan’s last wild felid, threatened by habitat loss and roadkill.
• Formosan clouded leopard (台灣雲豹) — declared extinct in 2014, now a symbol of conservation urgency.

Birds

Taiwan records over 600 bird species, with nearly 30 endemic:

• Taiwan blue magpie (台灣藍鵲) — a charismatic endemic often proposed as a “national bird.”
• Mikado pheasant (帝雉) — featured on the NT$1,000 bill, a cultural icon as well as a conservation priority.
• Black‑faced spoonbill (黑面琵鷺) — a global success story of wetland conservation, with Taiwan as a key wintering site.

Amphibians and Reptiles

Endemism is extremely high: more than 50% of reptiles and 60% of amphibians are endemic. Species such as the Morrison’s tree frog (莫氏樹蛙) and Taiwan salamanders (台灣山椒魚) are living relics of ancient climatic eras.

Insects and Invertebrates

Taiwan’s insect diversity is vast—over 20,000 recorded species and possibly double that number in reality. Many are endemic and tied to micro‑habitats, making them sensitive indicators of ecosystem change.

Marine Biodiversity

Taiwan’s marine ecosystems are just as rich as its forests.

• Coastline length: ~1,566 km
• Marine territory: ~170,000 sq km
• Ocean currents: the Kuroshio Current and China Coastal Current intersect here, creating nutrient‑rich waters.

Coral reefs are particularly significant. Taiwan hosts roughly 300 coral species—about one‑third of the world’s known corals—around Kenting, Green Island (綠島), Orchid Island (蘭嶼), and the northeast coast.

Conservation Challenges

Habitat Loss and Fragmentation

Urban expansion, agricultural development, and road construction fragment habitats—especially in lowland and mid‑elevation areas where biodiversity is highest.

Climate Change

Warming temperatures push alpine species higher, shrinking their living space. Sea‑level rise and ocean acidification threaten coastal wetlands and coral reefs.

Invasive Species

Non‑native species such as the golden apple snail (福壽螺) and red imported fire ant (紅火蟻) disrupt ecosystems and agricultural landscapes.

Over‑exploitation

Illegal wildlife trade, overfishing, and tourism pressure add stress to already vulnerable species.

Conservation Efforts and Success Stories

Taiwan has built a comprehensive protection network:

• National parks: 9
• National nature parks: 2
• Wildlife refuges: 20
• Nature reserves: 22

Notable success stories include:

• Black‑faced spoonbill recovery — from 288 birds in 1988 to over 6,000 by 2024.
• Leopard cat conservation — habitat corridors and “friendly farming” programs in Miaoli and Nantou.
• Coral reef restoration — coral nurseries and artificial reef projects.

Science, Data, and Citizen Participation

Institutions like the Taiwan Biodiversity Research Institute, Academia Sinica, and TaiBIF have made Taiwan a regional hub for biodiversity data. Citizen science also plays a critical role:

• eBird Taiwan for bird records
• iNaturalist for community species observations
• BioBlitz events that crowdsource biodiversity surveys

This blend of formal research and public participation is one of Taiwan’s most powerful conservation tools.

The Global Meaning of Taiwan’s Biodiversity

Taiwan’s biodiversity teaches a global lesson: a small island can be a world‑class conservation actor. Its ecosystems illustrate how geology, climate, and human history intertwine to create extraordinary species richness. Protecting this richness is not just a local duty; it is a contribution to global ecological resilience.

As Taiwan balances economic development with environmental stewardship, its choices will continue to shape the future of one of the planet’s most concentrated biodiversity hotspots.

Further Reading:

• Endemic Species
• National Parks
• Geography and Geology