Slide 1
A meadow visited by the sea
A salt marsh is a coastal wetland flooded by tides. Salt-tolerant plants grow where dry land grades into tidal water.
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Marsh vegetation is mostly non-woody, unlike a mangrove forest. Tidal creeks connect the plants and mud to surrounding water, giving the habitat a branching network of changing edges.
Slide 2
Height changes the timetable
Lower marsh areas flood more often than higher ones. Small changes in elevation can change which plants survive in each zone.
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Flooding affects oxygen in the soil as well as salt exposure. A plant must cope with several linked conditions, so marsh bands cannot be explained by salt tolerance alone.
Slide 3
Young fish gain a refuge
High tides let fish enter parts of the marsh. When water retreats, access changes for both small prey and larger predators.
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The same patch may alternate between feeding ground and refuge. This changing access helps explain why shallow coastal wetlands can support animals that spend adulthood in other habitats.
Slide 4
Dead plants still contribute
Marsh plants trap sediment and leave organic remains. Their roots and accumulated material help build the wetland soil beneath them.
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Decomposition proceeds differently in waterlogged, oxygen-poor soil. Some plant carbon can remain stored instead of rapidly returning to the air, making the soil part of the marsh's ecological value.
Slide 5
A marsh needs space to move
A salt marsh can shift inland as water levels change. A seawall or steep slope can block that movement.
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Its future also depends on sediment supply and plant growth. Rising water and growing ground are competing processes, so one marsh's persistence cannot be predicted from sea level alone.
Sources
- What is a salt marsh?
NOAA
- Wetlands, Marshes and Swamps
National Park Service