Kootenay Lake shore and riparian area.

ECOSYSTEMs

Riparian Areas

"Riparian" is taken from the Latin word ripa which means bank or shore. Riparian ecosystems are found alongside rivers, creeks, wetlands and any other water networks. They are the interface between water and land-based ecosystems, where components of both ecosystems can act and water-loving plants thrive in the water rich soils. Typically, riparian areas comprise less than 1% of the landmass across North America. These areas provide critical ecosystem services and are vital for both aquatic and terrestrial organisms. Natural disturbance along with fluvial processes are continually creating these dynamic and distinctive ecosystems that are crucial for biological habitat diversity. They are usually comprised of several structural layers with grasses, forbs, shrubs, and trees along with dead standing trees. Because of this, riparian areas are arguably the biggest contributors to biodiversity on the landscape.

Ecosystem services provided by riparian areas include: soil conservation and bank stabilization; supply of course woody debris for stream channel stability; sediment filtering of run off which is critical in agricultural and urban areas; water storage and release; and aquifer recharge. Riparian areas also contribute to the scenic landscape and are aesthetically pleasing.

Map

Biodiversity Interactive Maps - Slocan River Riparian Classification

Biodiversity Interactive Maps - Slocan River Riparian Ecosystem Sensitivity

Threats

Riparian areas are threatened in a number of ways across the province. In the southern interior of BC, many low elevation valleys have waterways that are lined with the Black Cottonwood Plant Community. This is one of the rarest ecosystems in the province of British Columbia and because of this it is on the provincial red list, which is akin to being endangered. The loss and degradation of riparian areas is caused by a number of factors including dams and dyking, livestock grazing, urban and agricultural development, recreation, logging, invasive plants and grasses, and changes to the natural hydrological regime.

Animal Species Supported

Many wildlife species, both aquatic and terrestrial, depend on riparian areas for food, water, security, rest, travel, and reproduction. There are several birds that are considered threatened or endangered that can be found in riparian areas of southern BC, including: the yellow-breasted chat, western screech owl, and Lewis’s woodpecker. Amphibians and reptiles such as the tiger salamander and the western rattlesnake also depend on riparian areas for food and refuge. Large mammals, such as elk, deer, and bears, will use the security of cover found in riparian areas for travel. Aquatic organisms and fish also depend upon riparian areas. Riparian vegetation provides both cover and shade to help maintain water temperature which in turn maintains desired oxygen levels. Vegetation that creates organic litter—such as leaves, needles, branches, and lichens falling from overhanging riparian vegetation—decomposes and becomes a primary food source for aquatic invertebrates, which in turn feeds the aquatic food chain.

Riparian Facts

  • Riparian areas add stability to banks and decrease the risk of erosion
  • Riparian vegetation increases the surface roughness of banks and decreases flow rates, thereby lowering the risk of downstream erosion
  • Filters surface runoff of sedimentation and contaminants
  • Riparian vegetation slows down surface water allowing material to settle out (less sediment entering water body)
  • Biggest contributor to biodiversity on the landscape
  • Vegetation provides shade and can reduce stream water temperature which leads to improved dissolved oxygen levels
  • Takes in and stores carbon
  • Section 9 of the Water Act states “a person may only make changes in and about a stream under an Approval in accordance with Part 7 of the Water Regulation.”
  • Under the Water Act, “changes in and about a stream” mean:
    • any modification to the nature of the stream including the land, vegetation, natural environment or flow of water within the stream, or
    • any activity or construction within the stream channel that has or may have an impact on a stream

Learn More About Riparian Areas

Related Reports

 

Ecosystems

Deciduous Forests

Grasslands

Riparian

Wetlands

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