Challenges Facing Riparian Ecosystems

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Presentation transcript:

Challenges Facing Riparian Ecosystems Stan Culling 9/18/2018

Introduction Riparian areas defined: Complexity of riparian vegetation Most productive areas of a region High edge to area ratio 9/18/2018

Biotic Importance Microhabitat diversity provide Nesting sites Thermal cover Migration routes Water Food Cover 9/18/2018

Loss of Riparian Habitat Increased water temperatures Reduced channel stabilization Increases fluctuation and intensity of flow and flood regimes Results in loss of species diversity 9/18/2018

Types of Change and Results Challenges to the integrity of these lotic systems include: Devegetation Silviculture Agriculture Grazing Urbanization Water projects Dams Channelization Hydro-electric generation Recreation 9/18/2018

Types of Change and Results Con’t Short-term catastrophic disturbances Floods Logging Construction Point source pollution 9/18/2018

Types of Change and Results Con’t Sustained disturbances Agriculture Grazing Logging 9/18/2018

Livestock Impacts 273 million acres grazed on public lands 150 million acres grazed on Government land High densities of cattle in or around riparian zones Seek out cover,water,forage 9/18/2018

Livestock Impacts Con’t Sings of cattle damage Vegetation reduction Wider,shallower streams Increased nutrient and sediment loads Bacterial outbreaks Bank trampling Increases soil compaction Inhibits root growth Increases runoff Decreases water availability to plants 9/18/2018

Management Managed separately Different stocking rates and periods Implementation of fencing Seasonality of grazing and herding Monitoring 9/18/2018

Management Con’t Results of various management Decreased channel width Increased bank stabilization Re-growth of native vegetation Decrease in fine sediment Decrease in temperature 9/18/2018