UK Ecosystems

An ecosystem includes living organisms, such as plants and animals, and the non-living conditions with which they interact, such as water, soil and temperature. The UK has both terrestrial ecosystems, found on land, and marine ecosystems, found in the sea.

The four main terrestrial ecosystems considered here are woodlands, heathlands, wetlands and moorlands. Their distribution means where they occur; their characteristics include their environmental conditions, vegetation and animals. They are not spread evenly across the UK: wetness, altitude, soil and human land use help explain the differences.

Woodlands: tree-covered habitats across the UK

Woodlands occur in pockets throughout the country. Some are deciduous broadleaved woodland, whose trees lose their leaves in winter. Others are coniferous woodland, with trees bearing needle-like leaves. Cool, wet parts of north-west Scotland also support temperate rainforest woodland.

The trees provide the main structure of the ecosystem, but woodland is more than its trees. Plants such as bluebells and ferns grow beneath them, while animals include deer and badgers. Different plants and animals use different parts of the habitat, from the ground vegetation to the trees themselves.

Heathlands: lowland shrubs on poor soils

Heathlands are mainly found in lowland areas of the southern UK, including the New Forest, Surrey Heaths and parts of Suffolk. Their sandy, porous soils allow water to pass through readily. Nutrients can be washed out, leaving soils that are usually acidic and relatively infertile.

Heather and gorse dominate this open landscape, and rabbits are typical animals. These low-growing shrubs give heathland a very different appearance from woodland. Management matters: without suitable management, bracken and trees such as silver birch can spread and change the habitat.

Wetlands: ecosystems shaped by water

Wetlands occur where water covers the ground or keeps soils waterlogged. They include habitats associated with rivers, streams, ponds, open water and floodplains. UK examples include the Somerset Levels, the Norfolk Broads and the floodplain of the River Severn.

The defining characteristic is the abundance of water, rather than a particular altitude. Floodplain soils can be fertile, supporting abundant vegetation. Reeds and bulrushes are typical plants, while otters and many kinds of birds use wetland habitats. Water, vegetation and animals are closely connected: changes to water levels can therefore change the habitat available to organisms.

Moorlands: exposed upland landscapes

Moorlands mainly occur in upland areas with high rainfall, often above about 250 metres. Examples include the Pennines, North Yorkshire, the Cheviot Hills, upland Wales and much of upland Scotland, including the Cairngorms.

Strong winds, cool conditions, heavy rainfall and cloud cover restrict plant growth. Moorlands commonly contain heather, bracken, rough grassland and peat bogs. Animals include deer, foxes and grouse.

Human activity has also shaped these landscapes. Long-term grazing has helped prevent trees and shrubs from becoming established, maintaining open land. Although moorland and heathland can both contain heather, their typical settings differ: moorland is mainly upland and exposed, whereas heathland is mainly lowland with acidic, nutrient-poor soils.

Marine environments provide resources and protection

The seas around the UK support organisms and habitats, but they also provide resources on which people rely.

• Food and employment: fisheries catch wild fish, while aquaculture farms aquatic organisms. These activities supply food and support thousands of jobs. Shoreline plants such as samphire can also be gathered for food.
• Energy: oil and gas reserves lie beneath the North Sea floor. Offshore wind farms, such as the London Array with its 175 turbines, provide renewable electricity. Tides and waves can also be used to generate energy.
• Tourism and recreation: coastal visits, sea angling and wildlife watching bring income and employment to coastal communities.
• Natural protection: saltmarsh and seagrass habitats help protect coasts against flooding and erosion. Coastal waters also contribute to climate regulation by absorbing greenhouse gases.

These benefits connect environmental health with people's livelihoods. For example, damage to fish habitats can affect both marine biodiversity and the fishing communities that depend on them.

Resource use can damage the habitats that provide it

Energy construction and dredging can disturb or destroy seabed habitats. Installing offshore wind turbines or oil and gas rigs affects the seabed. Dredging shipping routes, or fishing with dredging nets, can remove or damage seabed plants and other organisms. This reduces the food and shelter available to fish and other aquatic life. Renewable energy can reduce reliance on fossil fuels while still having local environmental impacts.

Pollution reaches the sea from both land and coastal activities. Fertilisers washed from farmland add nutrients to the water, encouraging excessive algal growth: this is eutrophication. Dense algae reduce the light reaching underwater plants, and oxygen availability can fall, harming marine organisms. Industrial waste can also pollute marine habitats.

Plastic waste harms animals through entanglement and ingestion. An animal caught in plastic may be unable to swim or breathe normally; swallowed plastic can interfere with feeding and lead to starvation.

Overfishing reduces fish stocks when catches exceed the rate at which populations can recover. North Sea cod are an example. The consequences extend beyond the species being caught: cod eat smaller fish, so reducing cod numbers can alter predator–prey relationships and disrupt the food chain.

Coastal development can replace habitats such as saltmarshes with buildings and infrastructure. This removes places where organisms live and can also reduce natural coastal protection.

Changes in marine conditions can also favour invasive species. Wireweed, originally from the Pacific, has spread to Britain from France. Its rapid growth allows it to compete with native seaweeds and seagrasses, potentially reducing biodiversity. Together, these pressures show why obtaining benefits from the sea must be balanced against maintaining functioning marine ecosystems.