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Diversion & Regulation of Stream Water

Discharge of Contaminants Into Stream System. Diversion & Regulation of Stream Water. Structural Alteration & Development of Floodplain. Introduction and Spread of Non-native Vegetation.

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Diversion & Regulation of Stream Water

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  1. Discharge of Contaminants Into Stream System Diversion & Regulation of Stream Water Structural Alteration & Development of Floodplain Introduction and Spread of Non-native Vegetation Conceptual Ecological Model of San Acacia Reach of Middle Rio Grande River – 2/13/07 1st DraftIbis Ecosystem Associates, Inc. Degraded Water Quality River Channel Fragmentation Severe Flow Reductions Loss of Natural Variability In Annual & Seasonal Discharge Pattern & Hydrograph Floodplain Loss & Fragmentation Floodplain Lowered Water Table Saltcedar Proliferation High Temperature, High pH, Low DO • Hydrologic Degradation of River Channel Habitat: • Reduced Magnitude & Duration of Spring Peak Flows • Reduced Flowing Water With Low-Moderate Currents • Narrowing of River Channel • Reduced Over-bank Flooding in Spring • Dewatering of River Channel & Formation of Isolated Pools • Reduced Sand and Silt Substrates • Reduced Eddies From Debris Piles, Pools, & Backwaters Loss of Connectivity Between Floodplain & Native Desert Habitat Loss of Persistent Moisture Levels & Wetland Habitats In Riparian Areas Increased Fire Frequency & Intensity In Riparian Areas Barrier to Upstream Movement of Silvery Minnow Loss of Dynamic Cycles Of Riparian Habitat Succession • River Channel Habitat Quality: • Perennially Flowing River With Peak • Spring Flows and Over-bank Flooding • Aggrading River With Shifting • Sand Substrate • Sinuous, Braided River That • Freely Migrates Across Floodplain, • Producing Eddies From Debris Piles, • Pools, & Backwaters • Floodplain Habitat Quality: • Persistent Moisture Levels & • Wetland Habitats in Riparian Areas • Highly Variable Mosaic of • Ephemeral Wetland Habitats, • Supporting Willow & Cottonwood • Stands Adjacent to Wetland Areas • Unfragmented Landscape of Wide • Lateral Extent, With Riparian Habitat • Connected to Native Desert Habitat Rio Grande Silvery Minnow Southwestern Willow Flycatcher* Drivers Effects Stressors Attributes * Impact of cowbird on flycatcher nesting to be covered in text.

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