wunder betaWetland water quality How do coastal wetlands filter water?
Follow runoff, sediment, plants, microbes, nutrients, salinity, and monitoring through how coastal wetlands filter water.
What you’ll learn
- Water carries a mixed loadExplain how runoff, tides, channels, and vegetation control the movement and settling of material.Water brings particles and dissolved substances into wetlands, where flow paths determine contact and residence time.
- Plants and soil hold nutrientsConnect plant uptake, roots, soil minerals, and organic matter to nutrient retention and release.Living tissue, roots, minerals, and organic matter temporarily store nutrients and create sites for reactions.
- Microbes change nitrogenDescribe how oxygen gradients and microbial reactions transform nitrogen in wetland soil.Linked microbial pathways can convert dissolved nitrogen into forms that are stored, exported, or returned to the atmosphere.
- The filter can be overwhelmedEvaluate how loading, salinity, erosion, drainage, and nutrient enrichment limit wetland filtration.Filtration is conditional: changing chemistry, flow, or pollutant supply can shift a wetland from retention toward export.
- Measure the whole pathwayDesign evidence-based measurements of inflow, outflow, storage, transformation, and changing conditions.A reliable filtration claim compares mass and mechanisms across tides, seasons, storms, and management states.
Questions this course answers
Why can a wetland retain suspended sediment?
Lower velocity and greater contact with vegetation and soil allow suspended particles to settle or be retained.
Put the pathway from runoff to settling in order.
Runoff supplies the material, flow transports it, and slower wetland water allows retention.
What happens when plants take up nitrogen or phosphorus?
Plant uptake is a form of retention, but nutrients can later return through decay or export.
Match each wetland component with its filtering role.
Different physical, chemical, and biological components contribute different pathways.
What is the outcome of denitrification described here?
Denitrifying microbes can reduce nitrate through reactions that end in nitrogen gas.
Put the coupled nitrogen pathway in order.
The sequence links decomposition, oxygen-dependent nitrification, and low-oxygen denitrification.
Grounded in trusted sources
- U.S. Geological Survey, Sea level rise and nutrient cycling in coastal wetlands, https://www.usgs.gov/news/sea-level-rise-and-nutrient-cycling-coastal-wetlands
- U.S. Environmental Protection Agency, Criteria Development Guidance for Wetlands Fact Sheet, https://www.epa.gov/nutrientpollution/criteria-development-guidance-wetlands-fact-sheet
- NOAA Fisheries, Coastal Wetland Habitat, https://www.fisheries.noaa.gov/national/habitat-conservation/coastal-wetland-habitat
- NOAA Monterey Bay National Marine Sanctuary, Water Quality, https://sanctuaries.noaa.gov/science/sentinel-site-program/monterey-bay/water-quality.html
- U.S. Geological Survey, Nutrient Cycling in Aquatic Ecosystems, https://www.usgs.gov/centers/upper-midwest-environmental-sciences-center/science/nutrient-cycling-aquatic-ecosystems
- U.S. Environmental Protection Agency, Why Monitoring of the Great Lakes Coastal Wetlands is Important, https://www.epa.gov/great-lakes-monitoring/why-monitoring-great-lakes-coastal-wetlands-important
- U.S. Geological Survey, A complex-systems approach to predicting effects of sea level rise and nitrogen loading on nitrogen cycling in coastal wetland ecosystems, https://pubs.usgs.gov/publication/70146200
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