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Nutrient cycle How do coastal wetlands transform nutrients?

Trace watershed inputs, tides, sediment, roots, microbes, nitrogen, phosphorus, eutrophication, and monitoring through nutrient transformation in coastal wetlands.

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

  1. Nutrients arrive from land and seaExplain how watershed runoff, wastewater, particles, and tides deliver nutrients to coastal wetlands.Nutrients enter from connected land and water pathways, and excess loading can drive eutrophication.
  2. Water and sediment create reaction zonesConnect flow, roots, sediment, salinity, and tidal channels with nutrient retention and transformation.Wetland shape and chemistry create changing places where nutrients can settle or react.
  3. Microbes transform nitrogenDistinguish microbial nitrogen transformations, storage, and permanent removal under changing oxygen and carbon conditions.Microbes move nitrogen among forms, sometimes returning it to the atmosphere and sometimes recycling it locally.
  4. Plants, animals, and sediments store nutrientsDescribe how living tissue, detritus, burial, oysters, and mangroves hold and redistribute nutrients.Biological and sediment pools can delay nutrient transport while remaining connected to future release.
  5. Measure a nutrient budget and manage the loadEvaluate nutrient claims with loads, boundaries, repeated sampling, restoration mechanisms, and source control.Credible management combines upstream reductions with wetland protection and evidence about what crosses the system boundary.

Questions this course answers

Why can excess nitrogen and phosphorus harm an estuary?

Excess nutrients can produce algal blooms whose decomposition consumes oxygen.

Put a watershed nutrient pathway in order.

Nutrients move through connected land, water, wetland, and estuary processes.

Why does slower water often increase wetland processing?

Slower, shallow flow can increase contact with roots, microbes, and sediment.

Match each feature with its nutrient role.

Wetland chemistry depends on connected physical and biological features.

What can denitrification do?

Under suitable low-oxygen conditions, microbes can convert nitrate through steps toward nitrogen gas.

A wetland process that converts nitrate toward atmospheric nitrogen is called ___.

Denitrification is a microbial nitrogen-removal pathway.

Grounded in trusted sources

  • NOAA National Ocean Service, Monitoring Estuaries: Nutrients, https://oceanservice.noaa.gov/education/tutorial_estuaries/est10_monitor.html
  • U.S. Environmental Protection Agency, About Coastal Wetlands, https://www.epa.gov/wetlands/about-coastal-wetlands
  • 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. 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, Why Monitoring of the Great Lakes Coastal Wetlands is Important, https://www.epa.gov/great-lakes-monitoring/why-monitoring-great-lakes-coastal-wetlands-important
  • 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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