Cortegada Island in Galicia: The World's Densest Fungal Hotspot 2026

Cortegada Island in Galicia, Spain, may be the world's densest fungal hotspot, with nearly 1,000 species recorded on just 44 hectares. This tiny island in the Ría de Arousa has become a statistical anomaly that fascinates mycologists globally.

While no one has thoroughly surveyed tropical forests—obvious contenders for the record—Cortegada's density is unmatched in documented studies. The island's fungal catalog represents almost half of all known fungi in Galicia, a region spanning three million hectares.

Why Cortegada Island Is a Fungal Paradise

Cortegada's 44 hectares—about 60 football fields—host more fungal species than Doñana National Park, which covers 1,081 square kilometers. This comparison, highlighted by a University of Santiago de Compostela (USC) team after 15 years of continuous sampling, underscores the island's extraordinary biodiversity.

The catalog now approaches 1,000 species, up from around 800 in 2020. That's roughly 40% of Galicia's mycological archive. Researcher Saúl de la Peña of the Ambiosol group noted that Cortegada quadruples Doñana's taxa and nearly doubles the 526 taxa found in Garajonay National Park, which spans 40 square kilometers.

Seven organisms have been described here for the first time for science, adding to the island's scientific value. Such discoveries highlight how much remains unknown even in well-studied regions.

How Researchers Uncover Hidden Fungal Diversity

Detecting fungi requires meticulous fieldwork. Researchers use transects—systematic paths through the island—to collect samples from soil, wood, and living plants. Over 15 years, this artisanal methodology has built a comprehensive picture of Cortegada's fungal community.

The island's varied habitats, including forests, shrubs, and coastal areas, provide diverse niches for fungi. Its isolation from the mainland also limits human disturbance, allowing sensitive species to thrive.

• Cortegada Island covers 44 hectares but hosts nearly 1,000 fungal species.
• This density is four times that of Doñana National Park and almost double that of Garajonay.
• Seven species were first described on the island, underscoring its scientific importance.
• Fifteen years of continuous sampling by USC researchers built the catalog.
• The island is part of the Atlantic Islands National Park of Galicia.

Cortegada vs. Other Protected Areas: A Fungal Showdown

The table below compares Cortegada's fungal richness with other notable parks. Despite its tiny size, Cortegada outpaces much larger protected areas in species count.

These figures are based on available studies and may change as research continues. Still, the contrast is striking and positions Cortegada as a global hotspot for fungal diversity.

What This Means for Mycology and Conservation

Cortegada's fungal richness highlights the importance of small, undisturbed habitats. Such areas can harbor exceptional biodiversity, challenging the assumption that larger reserves always protect more species. The background to this story is set out in Wealth Concentration in Galicia: More Owners Hold Multiple Properties. A related thread runs through Galicia's 'Crebas' Phenomenon: When the Sea Returns Printers. Earlier coverage in Hurricane Risk in Spain: Why Galicia Faces Growing Threat shows how the argument developed.

The island's inclusion in the Atlantic Islands National Park provides some protection, but invasive species and climate change remain threats. Continued monitoring is essential to safeguard this unique mycological treasure. A closer look at the same subject appears in Octopus Decline in Galicia: Why Spain's Fishing Industry Isn't Worried. Anyone following the wider picture can start with Spain Water Crisis: 12-Hour Storm Front Brings Relief to Galicia. The same theme surfaces in Galicia's Centenarian Secret: Why So Many Live Past 100, which takes a different angle.

For mycologists, Cortegada offers a natural laboratory to study fungal ecology, evolution, and biogeography. The seven species described there new to science are just the beginning; more discoveries likely await. Context on how this played out before sits in Trending: latest articles. A companion piece, Fresh Kills: New York's 53-Year Landfill Becomes a Massive Park, approaches the same subject from another angle.

FAQ

For those interested in exploring more of Galicia's natural wonders, consider reading about traveling in France for a different European perspective. The region's rich biodiversity is just one of many reasons to visit.

Understanding fungal hotspots like Cortegada can inform conservation strategies worldwide. Protecting small, biodiverse areas is crucial for maintaining global ecosystem health.

As research continues, Cortegada Island will likely yield more surprises, reinforcing its status as a mycological jewel.