Types of Wetlands
Wetlands are found on every continent except Antarctica and come in several distinct types. What they share: soil that is saturated with water for at least part of the year, which creates unique conditions for specialized plants and animals.
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Marsh
Grasses & Reeds
- Shallow, open wetlands dominated by grasses, reeds, and sedges
- No trees — sunlight reaches the water surface, supporting rich aquatic life
- Famous examples: Florida Everglades, Chesapeake Bay marshes, Mississippi Delta
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Swamp
Flooded Forest
- Wetlands dominated by trees and woody shrubs — forests with waterlogged soil
- Cypress swamps of the American South are iconic — knobby "cypress knees" rise from the water
- Mangrove swamps grow in tropical coastlines and protect shorelines from storms
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Bog
Peat & Moss
- Acidic, nutrient-poor wetlands filled with sphagnum moss that builds up into peat
- Some plants turn carnivorous to get nutrients — sundews and pitcher plants eat insects!
- Accumulate peat for thousands of years — storing enormous amounts of carbon
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Fen
Mineral-Rich
- Like bogs but fed by groundwater that brings in minerals — less acidic
- Richer in plant diversity than bogs due to the mineral-rich water
- Common in northern Europe and Canada
Famous Wetlands
Some of the world's most spectacular wetlands are home to extraordinary concentrations of wildlife.
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The Everglades
Florida, USA
- The only subtropical wilderness in North America — home to American alligators and crocodiles
- Critical habitat for 350+ bird species, manatees, and Florida panthers
- Nicknamed "the river of grass" — a slow-moving sheet of water 50 miles wide
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The Pantanal
South America
- The world's largest tropical wetland — covering 75,000 square miles in Brazil
- Home to the highest concentration of jaguars anywhere on Earth
- Floods seasonally — up to 80% of the Pantanal floods each wet season
Wetland Animals
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Alligator
Keystone Species
- Dig "alligator holes" that hold water during droughts — saving many other species
- Have been on Earth for 37 million years — virtually unchanged
- Regulate fish and turtle populations, keeping the wetland ecosystem balanced
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Great Blue Heron
Patient Hunter
- Stands motionless in shallow water then strikes fish with lightning-fast precision
- Wingspan of nearly 6 feet — one of North America's largest birds
- Nests in large colonies called heronries — sometimes with hundreds of nests
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River Otter
Playful Swimmer
- Streamlined body, webbed feet, and dense waterproof fur for aquatic life
- Can hold their breath for up to 8 minutes underwater
- Known for playing — sliding down muddy banks repeatedly just for fun
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Beaver
Ecosystem Engineer
- Build dams that create ponds — artificially expanding wetland habitat for hundreds of species
- Teeth never stop growing — they must constantly chew wood to keep them filed down
- Second largest rodent in the world — up to 60 pounds
Wetland Plants
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Cattail
Marsh Staple
- Iconic brown "hot dog on a stick" seed heads release thousands of fluffy seeds
- Entire plant is edible — roots, shoots, and pollen have been food sources for thousands of years
- Provide nesting material and shelter for marsh wrens, red-winged blackbirds, and ducks
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Mangrove
Coastal Protector
- Grows in saltwater — one of the few trees that can tolerate ocean salinity
- Tangled root systems protect coastlines from storm surge and erosion
- Nursery habitat for countless fish species — juvenile fish hide among the roots
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Water Lily
Floating Beauty
- Flat leaves float on the surface to absorb sunlight while roots anchor in mud below
- Provide shade that reduces algae growth and keeps water cooler for fish
- Flowers open in the morning and close at night — some bloom for only 3 days
Why Wetlands Matter
Wetlands provide irreplaceable services to both wildlife and humans:
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Water Filtration
Nature's Filter
- Plants and soil absorb pollutants, heavy metals, and excess nutrients from water
- Can remove up to 92% of phosphorus and 95% of nitrogen from agricultural runoff
- Provide cleaner water downstream for drinking, farming, and wildlife
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Flood Control
Natural Sponge
- Absorb excess water during heavy rains, slowly releasing it over time
- A single acre of wetland can store up to 1.5 million gallons of floodwater
- Loss of wetlands dramatically increases flood damage in downstream communities
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Fish Nurseries
Where Fish Are Born
- Over two-thirds of commercially harvested fish species depend on wetlands as nurseries
- Shallow, sheltered water protects juvenile fish from predators
- Rich in the tiny invertebrates that young fish need for food
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Carbon Storage
Climate Regulator
- Peat bogs store more carbon per acre than any other ecosystem — including forests
- When drained and destroyed, wetlands release massive amounts of CO2
- Protecting wetlands is one of the most effective climate change strategies
💧 Nature's Water Treatment Plants
Wetlands filter pollutants from water more effectively than most human-built water treatment systems — and for free! Municipalities that protect upstream wetlands spend far less on water treatment than those that allow wetlands to be drained. Despite this, over 35% of the world's wetlands have been lost since 1970 — drained for agriculture, filled for development, or degraded by pollution.
Wetland Facts
35%
of the world's wetlands have been lost since 1970 — faster than any other ecosystem
40%
of Earth's species live in or depend on wetlands for at least part of their life cycle
1.5M gal
of floodwater can be stored per acre of wetland — saving billions in flood damage costs
$47 trillion
estimated annual value of services provided by wetland ecosystems worldwide
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