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Water filter How do coastal wetlands filter and transform water?

Follow runoff through wetland flow, sediment settling, microbial nutrient transformations, pollutant storage, and evidence-based restoration.

5
lessons
~20 min
to learn
🔬 Science
subject
Adults
level
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What you’ll learn

  1. Water arrives with a historyExplain how watershed runoff, residence time, tides, and flow determine what a coastal wetland receives and can process.Water-quality function begins with the source, timing, volume, and path of incoming water.
  2. Sediment slows and settlesDescribe how vegetation, roots, channels, and settling move suspended sediment and particle-bound pollutants.Wetland structure slows flow and stores sediment, but disturbance can remobilize that material.
  3. Microbes transform nutrientsTrace how microbes, plants, carbon, oxygen, and sediment change nitrogen and phosphorus forms.Nutrients may be transformed, stored, exported, or released through linked biological and chemical pathways.
  4. Pollutants have different fatesEvaluate how metals, pesticides, pathogens, heat, salinity, and disturbance alter pollutant risk.A lower water concentration does not always mean a pollutant was destroyed or made harmless.
  5. Management follows the evidenceChoose source controls, restoration actions, and monitoring designs that test a specific water-quality claim.Effective management protects the watershed and measures the process and outcome over time.

Questions this course answers

Why should a water-quality study measure both an inlet and an outlet?

An inlet-outlet comparison, combined with flow and timing, tests whether a change is due to wetland processing rather than dilution or a changing source.

Put a wetland filter study in a useful order.

A claim needs a defined target, paired measurements, and an interpretation that accounts for water volume and chemical pathways.

What do marsh stems and roots do to suspended sediment?

Vegetation increases drag and stabilizes soil, which can help particles settle, although storms and erosion can reverse storage.

Why is storing a pollutant in sediment not the same as destroying it?

A lower water concentration identifies a new location, not necessarily a harmless substance.

What can happen to nitrate in low-oxygen wetland sediment?

Denitrifying microbes can use nitrate and release nitrogen gas, when carbon, oxygen conditions, and other requirements support that pathway.

Match each nutrient process with its description.

Nutrients move among living biomass, sediment, dissolved forms, and gases through different processes.

Grounded in trusted sources

  • U.S. Environmental Protection Agency, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • U.S. Environmental Protection Agency, Wetlands, https://www.epa.gov/report-environment/wetlands
  • NOAA Fisheries, Coastal Wetland Habitat, https://www.fisheries.noaa.gov/national/habitat-conservation/coastal-wetland-habitat
  • NOAA National Estuarine Research Reserve System, Estuaries: Nature's Water Filters, https://coast.noaa.gov/estuaries/news/filtration-animation.html
  • U.S. Geological Survey, Wetland Hydrology, Water Quality, and Associated Functions, https://water.usgs.gov/nwsum/WSP2425/hydrology.html
  • U.S. Environmental Protection Agency, National Guidance Water Quality Standards for Wetlands, https://www.epa.gov/cwa-404/national-guidance-water-quality-standards-wetlands
  • Wikimedia Commons MediaWiki API image records, https://commons.wikimedia.org/w/api.php

Every Wunder lesson is built from real, reputable sources — never invented.

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