The southernmost forested ecosystem, with 5% of world's non-vascular plant diversity. Lichens and mosses here contain compounds found nowhere else.
Mirko Thiessen, CC BY-SA 2.0, via Wikimedia Commons
The miniature forests
The Cape Horn Biosphere Reserve, established in 2005, protects the world's southernmost forests. This remote wilderness at the tip of South America is a hotspot for bryophytes—the group of non-vascular plants that includes mosses, liverworts, and hornworts. In an area covering less than 0.01% of the planet's land surface, the reserve contains over 5% of the world's known bryophyte species. This includes more than 450 species of mosses and 300 species of liverworts.
These Magellanic subpolar forests are dominated by three species of southern beech: the evergreen Nothofagus betuloides and the deciduous Nothofagus pumilio and Nothofagus antarctica. In the cold, perpetually damp conditions, with annual rainfall reaching 4,000 millimeters (157 inches) in the west, these trees create a perfect habitat for the non-vascular plants that form vast, complex carpets on the forest floor, rocks, and tree bark. This dense, low-growing world is often called the "miniature forests of Cape Horn." To appreciate this biodiversity, a concept known as "ecotourism with a hand lens" is promoted, encouraging visitors to look down and examine the complex ecosystems at their feet.
A subantarctic chemical laboratory
The extreme climate of Cape Horn—defined by high winds, low temperatures, and UV radiation—has driven the evolution of unique survival strategies among its plant life. Lichens and mosses in the reserve produce secondary metabolites, chemical compounds that protect them from the harsh environment. More than 800 of these unique compounds are known from lichens, including depsides, depsidones, and usnic acid derivatives. These substances are a subject of scientific study for their potential pharmaceutical applications.
Lichens, which are a symbiotic partnership between a fungus and an alga, are particularly adept at creating these chemical defenses. Their health and diversity are bio-indicators of air quality; the lichen communities in the Cape Horn Biosphere Reserve confirm that the region has some of the cleanest air on Earth. Researchers with the Sub-Antarctic Biocultural Conservation Program, an international collaboration, study these ecosystems to understand their unique ecological dynamics and to inform conservation policy. The program integrates ecological science with the traditional ecological knowledge of the Yaghan people, who have inhabited this region for millennia.
💡Fun Facts
The reserve is the ancestral territory of the Yaghan people, the world's southernmost indigenous population, who traditionally used the bark of the evergreen *Nothofagus betuloides* to construct canoes.
The region is subject to sudden, violent squalls called williwaws, which are gusts of cold, dense air that descend from coastal mountains and can strike ships with little warning.
The southernmost tree on Earth, a Magellan's beech (*Nothofagus betuloides*), grows on Hornos Island within the reserve.
The South Andean deer or Chilean huemul (*Hippocamelus bisulcus*), an endangered species and the national animal of Chile, is found in the reserve's remote forests.
The reserve is a remote wilderness without set opening hours. Access is almost exclusively through pre-booked, multi-day expedition cruises.
Admission
Access is included in the price of expedition cruises departing from cities like Punta Arenas.
Accessibility
Access is by boat only, often requiring a transfer to a smaller Zodiac for shore landings, weather permitting. Terrain on the islands is rugged and includes wooden walkways and stairs.
