Prairie wetlands set the pace of annual runoff
In 69% of 109 Prairie Pothole catchments, maximum wetland inundation outpredicts climate for annual runoff, often with a storage threshold.
Source
Wetlands set the pace of annual runoff in the northern Great Plains
Study at a glance
- Design
- Other — 1984–2021 climate/streamflow vs satellite wetland inundation across Prairie Pothole catchments
- N
- N=109 · 109 unregulated Prairie Pothole catchments
- Population
- Prairie Pothole Region catchments with wetland inundation and annual runoff
- Outcome
- Maximum wetland inundation outpredicting climate for annual runoff in most catchments
Structured fields used in claim comparison tables when every cited study has a complete layer.
What they did
Authors combined 1984–2021 daily climate and streamflow for 109 unregulated Prairie Pothole catchments with satellite maximum inundated wetland area (MIWA), then used partial correlations and power-law fits to runoff ratio and high-flow ratio.
What they found
69% of catchments are fill–spill dominated: MIWA beats aridity and snow persistence for runoff, and climate mostly acts by changing inundation. Median MIWA–HFR correlation is 0.71. Among those catchments, 64% have threshold-like buffering (power-law b>1.25); more isolated wetlands mean stronger buffering.
The limits
What it doesn't show
40% of fill–spill catchments have MIWA variability unexplained by the climate indices used. The study is correlative (not a drainage experiment) and does not map nutrient export, only hydrologic connectivity.
Key terms
- Prairie Pothole Region (PPR)
- ~780,000 km² northern Great Plains wetland landscape.
- Fill–spill
- Potholes store water until a threshold, then overflow downslope.
- MIWA
- Annual maximum inundated wetland area from satellites.
- Runoff ratio (ROR)
- Annual streamflow divided by annual precipitation.
- GIWs
- Geographically isolated wetlands away from the river network.
Flashcards
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Fill–spill-dominated catchments are about:
Common questions
What mostly sets year-to-year runoff?
Wetland inundation extent, not climate directly, in 69% of catchments.
Is the inundation–runoff curve linear?
Usually not: 64% are threshold-like buffers.
What landscape trait strengthens buffering?
Larger isolated (GIW) wetland extent (ρ=0.65).
When do inundation and streamflow peak?
Snowmelt: inundation April–May, streamflow April–June.
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