Overview
The Palearctic ecozone (also spelled Palaearctic) is one of the principal biogeographic realms used to describe the distribution of terrestrial life. It is the largest of the Earth's terrestrial ecozones, encompassing a broad range of climates and landscapes that influence the composition of plants and animals across continents.
Extent and boundaries
Geographically the Palearctic includes most of Europe, Asia north of the Himalayan foothills, the northern portion of Africa, and the northern and central parts of the Arabian Peninsula. Its northern edge reaches into the Arctic, while its southern margins are defined by mountain chains, deserts and biogeographic transitions such as the Sahara and the Himalayas.
Major habitats and ecoregions
- Boreal forests (taiga) stretching across northern Eurasia.
- Temperate broadleaf and mixed forests in much of Europe and eastern Asia.
- Arctic tundra along the northern coasts and islands.
- Mediterranean woodlands and scrub around the Mediterranean Basin.
- Temperate grasslands and steppe, and interior deserts and semi-deserts.
Flora, fauna and notable features
Plant and animal communities in the Palearctic vary from the lichen- and moss-dominated tundra to coniferous taiga, and to sclerophyllous shrubs in Mediterranean regions. Typical large mammals include various deer species, wolves, brown bears and wild boar in suitable habitats, while migratory and resident birds form a rich avifauna. Many species show wide Palearctic ranges, whereas some regions—like the Mediterranean Basin—support high endemism and distinct assemblages.
History, connections and biogeography
The Palearctic has been shaped by past climate oscillations, glaciation and land connections. During colder periods, ranges shifted southward and later recolonized northern areas. The realm is often considered together with the Nearctic (North America) under the collective term Holarctic because of shared species and historical exchanges across former land bridges such as Beringia.
Human impacts and conservation
Human activity has profoundly altered Palearctic landscapes through agriculture, urban expansion, logging and infrastructure. Some ecoregions remain relatively intact in remote areas of Siberia and northern tundra, while others—especially in Europe and the Mediterranean—face fragmentation and biodiversity loss. Conservation responses include protected areas, restoration projects and regional strategies to preserve representative habitats and threatened species.
Distinctions and importance
The Palearctic is distinguished by its size, climatic breadth and role in hosting species adapted to temperate and boreal conditions. Its study is central to understanding northern hemisphere biogeography, patterns of endemism, and how continental-scale processes influence biodiversity.