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Coastal estuaries, such as this one on the Khutze River on British Columbia's mainland coast, are vital as a spring-time food source for coastal grizzly bears.
Image by Adrian Dorst.

Pattern
Wildlife Corridors

Wildlife corridors are necessary because they maintain biodiversity, allow populations to interbreed, and provide access to larger habitats.

Wildlife Corridors connecting Core Reserves are crucial since they increase the effective amount of habitat that is available for species and effectively reverse habitat fragmentation. This is especially important for migratory animals and those with large home ranges. Larger habitats support greater Biodiversity, larger populations, and a wider range of food sources and shelter. They also allow populations to interbreed, improving long-term genetic viability. However, Wildlife Corridors cannot substitute for large areas of protected habitat like those in core reserve systems.

At the largest scale, Wildlife Corridors must be wide enough to allow easy movement for even the largest mammals, including grizzlies, cougars, and wolves. Widths of several miles are typical. However, Wildlife Corridors can serve at smaller scales to provide habitat connectivity for other species, including amphibians, fish, and birds. They are particularly beneficial along riparian corridors, where they provide both aquatic and terrestrial connectivity. In urban areas, they can provide significant recreational opportunities and important linkages in a highly fragmented landscape. Whenever possible, urban and rural parks and open spaces should be linked to form functional Wildlife Corridors, which can then be joined to outlying core reserves.

Since Wildlife Corridors are typically narrow and vulnerable, they must be managed with extreme caution. For instance, pesticide use next to a corridor might have destructive impacts on pollinators, in turn reducing plant diversity. In many cases, Sustainable Forestry, Sustainable Agriculture, and other non-extractive land-uses can be made compatible with Wildlife Corridors with special management practices acknowledging the needs of species using the corridor.

When roads or other infrastructure cross a Wildlife Corridor, it is essential to maintain transportation connections that do not diminish the effectiveness of the corridor. Multiple intersecting Wildlife Corridors offering multiple pathways between Core Reserves provide important resiliency to a wildlands network.

Identify critical existing or potential Wildlife Corridors between Core Reserves, protect them, and mange them for ecosystem connectivity.


Examples of this pattern in action:


For watershed organizing and restoration, the Mattole Restoration Council of Northern California stands out as a pioneering model. In this classic article of bioregional literature, Freeman House, one of the initiators of the Mattole effort, details the Council's history and broader lessons drawn from that experience. This article appeared in Whole Earth Review, Spring 1990.

I-90 Ocean to Mountain Corridor
The Greenway Education Program focuses on the challenge of sustaining a healthy, natural environment in balance with the needs of a growing population. A key element of the Greenway plan is preserving forests along the Interstate 90 corridor in Washington State.


A greenbelt of wilderness and parkland from Goldstream Park to the Sooke Basin. One of the links is a small property between Ayum Creek and the Galloping Goose trail. Sea-to-Sea Green/Blue Belt Alliance (a new coalition of seven local conservation organizations).


Organizations whose work incorporate this pattern:

American Wildlands


References:

Hudson, W.E. Landscape Linkages and Biodiversity. Island Press. Washington, DC. 1991.

Little, C.E. Greenways for America. John Hopkins University Press. Baltimore, MD. 1990.

Smith, Daniel S and Paul Cawood Hellmund, eds.. Ecology of Greenways: Design and Function of Linear Conservation Areas. University of Minnesota Press. Minneapolis, MN. 1993.


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Pattern Index

A Conservation Economy

Social Capital

Fundamental Needs

Subsistence Rights

Shelter For All

Health

Access To Knowledge

Community

Social Equity

Security

Cultural Diversity

Cultural Preservation

Sense Of Place

Beauty And Play

Just Transitions

Civic Society

Natural Capital

Ecological Land-Use

Connected Wildlands

Core Reserves

Wildlife Corridors

Buffer Zones

Productive Rural Areas

Sustainable Agriculture

Sustainable Forestry

Sustainable Fisheries

Ecotourism

Compact Towns And Cities

Human-Scale Neighborhoods

Green Building

Transit Access

Ecological Infrastructure

Urban Growth Boundaries

Ecosystem Services

Watershed Services

Soil Services

Climate Services

Biodiversity

Economic Capital

Household Economies

Green Business

Long-Term Profitability

Community Benefit

Green Procurement

Renewable Energy

Sustainable Materials Cycles

Resource Efficiency

Waste As Resource

Product As Service

Local Economies

Value-Added Production

Rural-Urban Linkages

Local Assets

Bioregional Economies

Fair Trade

True Cost Pricing

Product Labeling