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agriculture. urbanization. industry. channel alteration. upstream impoundment. riparian devegetation. WWTP effluent. other point sources. industrial effluent. stormwater drainage. downstream impoundment. groundwater withdrawals. surface water withdrawals. watershed devegetation.

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Presentation Transcript

agriculture

urbanization

industry

channel alteration

upstream impoundment

riparian devegetation

WWTP effluent

other point sources

industrial effluent

stormwater drainage

downstream impoundment

groundwater withdrawals

surface water withdrawals

watershed devegetation

tile drains

forestry & silviculture

mining & resource extraction

human activity

↓ groundwater inputs

↓ surface water inputs

↑ overland transport efficiency

↑ discharge regulation

↑ discharge into surface waters

↓ infiltration

Δ channel morphology

↓ water uptake

↓ sinuosity

↑ armoring

↑ surface runoff

↓ permeability

↑ incision

additional step in causal pathway

source

Δ physical habitat

other stressors

↑ stranding

Δ discharge patterns

Δ structural habitat

mode of action

↑ water velocity

↓ water depth

↓magnitude, ↑ frequency of low discharges

↑ magnitude, ↑ frequency of high discharges

↓magnitude, ↓ frequency of high discharges

Δ discharge pattern timing or sequencing

↑ magnitude, ↓ frequency of low discharges

↑ daily discharge variability

↓ seasonal discharge variability

Δ discharge duration

response

↑ water column habitat

↑ scouring & displacement

↑ channel drying

↓ scouring & displacement

Δ life cycle cues

↓ floodplain inundation

↓ wetted channel area

↓ scouring & displacement

↑ scouring & displacement

↓ slow water habitat

↓ water column habitat

Detailed conceptual diagram for FLOW ALTERATION

Developed 7/2007 by Kate Schofield & Rick Ziegler; modified 7/2010

↓ macrophytes

↓ EPT taxa

↑ bryophytes

↑ macrophytes

↑ lentic taxa

LEGEND

↑ water depth

↓ water velocity

proximate stressor

interacting stressor

↑ non-native taxa

↓ floodplain-dependent taxa or life stages

↓ drought-tolerant taxa

↑ drought-tolerant taxa

↓ water column taxa

↑ water column taxa

↓ benthic taxa or life stages

↓ benthic taxa or life stages

↓ fish richness or diversity

↓ invertebrate richness or diversity

↑ other impairments

↓ plant richness or diversity


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