Limiting Factors



Columbia Plateau Province

Crab Subbasin 386

BLUEGILL
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation..
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Sedimentation from agricultural run-off is problematic throughout the subbasin.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
KOKANEE
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Habitat Quantity and Quality Morphological Changes Freshwater-Floodplain Agricultural Practices; Urbanization Wetland Loss; Impervious Surfaces (Road Density); Riparian Degradation Juveniles Lack of habitat connectivity and channel confinement.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Instream Agricultural Practices; Urbanization Riparian Degradation; Impervious Surfaces Juveniles Channel confinement limits in-stream habitat diversity and complexity.
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation.
Instantaneous Mortality Predation by or Competition with Non-Native Species -- Species Management; Fishery Management Species Introduction; Predators: Fish Juveniles Altered fish communities have resulted in high levels of predation and competition.
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Lack of spawning habitat exists due to sedimentation.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
LARGEMOUTH BASS
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation..
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Sedimentation from agricultural run-off is problematic throughout the subbasin.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
RAINBOW TROUT
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Habitat Quantity and Quality Access and Availability Freshwater-Instream Agricultural Practices; Urbanization Migration Impediments Adults Barriers limit trout production throughout the subbasin.
Habitat Quantity and Quality Morphological Changes Freshwater-Floodplain Agricultural Practices; Urbanization Wetland Loss; Impervious Surfaces (Road Density); Riparian Degradation All Lack of habitat connectivity and channel confinement.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Riparian Agricultural Practices Diking; Filling; Riparian Degradation All Lack of habitat connectivity and channel confinement and invasive plant species contribute to poor riparian conditions.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Instream Agricultural Practices; Urbanization Riparian Degradation; Impervious Surfaces Juveniles Channel confinement limits in-stream habitat diversity and complexity.
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Lack of spawning habitat exists due to sedimentation.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
Water Quantity Decreased Water Quantity; Increased Water Quantity -- Agricultural Practices Water: Storage or Withdrawal, Channelization, Management All Flows have increased in parts of the subbasin due to the management of croplands, whereas elsewhere flows are intermittent. Lack of habitat connectivity due to intermittent surface flows exists throughout the subbasin.
SMALLMOUTH BASS
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation..
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Sedimentation from agricultural run-off is problematic throughout the subbasin.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
SUMMER STEELHEAD
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Habitat Quantity and Quality Access and Availability; Morphological Changes Estuary Agricultural Practices; Urbanization Diking; Filling; Riparian Degradation; Wetland Loss Smolts Historical complex habitats have been modified through channelization, diking, development and other practices.
Habitat Quantity and Quality Morphological Changes Freshwater-Floodplain Agricultural Practices; Urbanization Diking; Impervious Surfaces (Road Density); Riparian Degradation Juveniles Lack of habitat connectivity and channel confinement.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Riparian Agricultural Practices Diking; Filling; Riparian Degradation Juveniles Lack of habitat connectivity and channel confinement and invasive plant species contribute to poor riparian conditions.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Instream Agricultural Practices Diking; Filling; Wood/Structure Removal Juveniles Channel confinement limits in-stream habitat diversity and complexity.
Instantaneous Mortality Anthropogenic Mortality -- Dam or Hydropower Facility Management Migration Impediments Juveniles Juveniles and adults must pass five dams during migration.
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation.
Instantaneous Mortality Predation by or Competition with Non-Native Species -- Species Management; Fishery Management Species Introduction; Predators: Fish Juveniles Altered fish communities have resulted in high levels of predation and competition.
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adults Lack of spawning habitat exists due to sedimentation.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals Summer parr, adult spawners Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration Summer parr, adult spawners Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
Water Quantity Decreased Water Quantity; Increased Water Quantity -- Agricultural Practices Water: Storage or Withdrawal, Channelization, Management All Flows have increased in parts of the subbasin due to the management of croplands, whereas elsewhere flows are intermittent. Lack of habitat connectivity due to intermittent surface flows exists throughout the subbasin.
SUMMER/FALL CHINOOK
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Habitat Quantity and Quality Access and Availability; Morphological Changes Estuary Agricultural Practices; Urbanization Diking; Filling; Riparian Degradation; Wetland Loss Smolts Historical complex habitats have been modified through channelization, diking, development and other practices.
Habitat Quantity and Quality Morphological Changes Freshwater-Floodplain Agricultural Practices; Urbanization Diking; Impervious Surfaces (Road Density); Riparian Degradation Juveniles Lack of habitat connectivity and channel confinement.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Riparian Agricultural Practices Diking; Filling; Riparian Degradation Juveniles Lack of habitat connectivity and channel confinement and invasive plant species contribute to poor riparian conditions.
Habitat Quantity and Quality Small-Scale Structural Complexity; Morphological Changes Freshwater-Instream Agricultural Practices Diking; Filling; Wood/Structure Removal Juveniles Channel confinement limits in-stream habitat diversity and complexity.
Instantaneous Mortality Anthropogenic Mortality -- Fishery Management Harvest Adults Fall Chinook are subject to both ocean and freshwater harvest.
Instantaneous Mortality Anthropogenic Mortality -- Dam or Hydropower Facility Management Migration Impediments Juveniles Juveniles and adults must pass five dams during migration.
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation.
Instantaneous Mortality Predation by or Competition with Non-Native Species -- Species Management; Fishery Management Species Introduction; Predators: Fish Juveniles Altered fish communities have resulted in high levels of predation and competition.
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adults Lack of spawning habitat exists due to sedimentation.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals Summer parr, adult spawners Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration Summer parr, adult spawners Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
Water Quantity Decreased Water Quantity; Increased Water Quantity -- Agricultural Practices Water: Storage or Withdrawal, Channelization, Management All Flows have increased in parts of the subbasin due to the management of croplands, whereas elsewhere flows are intermittent. Lack of habitat connectivity due to intermittent surface flows exists throughout the subbasin.
WALLEYE
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation..
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Sedimentation from agricultural run-off is problematic throughout the subbasin.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.
YELLOW PERCH
Key Limiting Factor Impairment Habitat Affected Threat Type Threat Name Life Stage (s) Description
Instantaneous Mortality Predation -- Dam or Hydropower Facility Management; Species Management Predators: Avian Juveniles Artificial habitat (islands for nesting Caspian terns) has resulted in high levels of predation..
Sediment Conditions Increased Sediment Quantity Freshwater-Instream Agricultural Practices Sediment: Bank Destabilization Adult spawners Sedimentation from agricultural run-off is problematic throughout the subbasin.
Toxic Contaminants Water; Biota -- Pollution and Contamination Pollution: Biological Wastes, Fertilizer, & Pharmaceuticals All Chemicals from agricultural run-off are problematic throughout the subbasin.
Water Quality Temperature -- Water Management Water: Temperature and Gas alteration All Elevated summer water temperatures and low dissolved oxygen levels are problematic throughout the subbasin.