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Wetland migration How do coastal wetlands migrate inland?

Trace relative sea level, sediment, roots, barriers, habitat shifts, monitoring, and adaptation through inland coastal-wetland migration.

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

  1. Rising water changes the wetland's addressExplain how relative sea level, inundation, and salinity change the conditions experienced by a coastal wetland.Local water levels and ground movement determine the flooding schedule that plants and soils experience.
  2. Vertical growth buys timeConnect sediment, roots, organic matter, erosion, and subsidence to wetland elevation.Wetland surfaces can build upward, but only the balance of gains and losses determines whether they keep pace.
  3. Migration needs roomExplain how coastal wetlands move inland and why elevation, connectivity, and barriers shape migration potential.Landward movement is possible only where tides, organisms, and space remain connected.
  4. A moving wetland is a changing communityEvaluate how plant, animal, carbon, and habitat changes interact during wetland migration.A changing wetland can gain one habitat type while losing another, so function and community matter as much as area.
  5. Adaptation is an evidence loopUse goals, diagnosis, monitoring, comparison, and revision to reason about wetland adaptation.Evidence-led adaptation protects processes where possible and keeps decisions adjustable as the shoreline changes.

Questions this course answers

Why can two coastal wetlands experience different flooding changes even when global sea level rises at the same rate?

Local subsidence, uplift, compaction, and water levels combine to determine relative sea-level change at each wetland.

Put the wetland elevation balance in a useful order.

A comparison is meaningful only after the water pattern, gains, and losses are measured in the same reference frame.

Match each map layer to what it helps reveal.

Migration estimates need both physical reach and the landscape conditions that make a future habitat connected or unavailable.

In your own words, why can a gain in salt-marsh area still represent an ecological loss?

Area alone does not say which wetland type changed or which organisms and people depended on the habitat that was replaced.

Complete the adaptation sequence.

Changing conditions and monitoring results make revision part of the method rather than an afterthought.

Grounded in trusted sources

  • NOAA Digital Coast, Sea Level Rise Wetland Impacts and Migration, https://coast.noaa.gov/digitalcoast/data/slr-wetland.html
  • NOAA Digital Coast, Marshes on the Move: A Manager's Guide, https://coast.noaa.gov/data/digitalcoast/pdf/marshes-on-the-move.pdf
  • U.S. Geological Survey, Constraints on the adjustment of tidal marshes to accelerating sea level rise, https://www.usgs.gov/publications/constraints-adjustment-tidal-marshes-accelerating-sea-level-rise
  • U.S. Geological Survey, Chesapeake Bay marsh migration potential under sea-level rise, https://www.usgs.gov/data/chesapeake-bay-marsh-migration-potential-under-sea-level-rise-ver-20-may-2026
  • U.S. Environmental Protection Agency, Protect Coasts, https://www.epa.gov/green-infrastructure/protect-coasts
  • 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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