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Wonderful Wetlands!

Objectives
After this lesson, students will be able to:
1. Define wetlands.
2. List six different types of wetlands, and describe characteristics of each.
3. List five functions or benefits of wetlands.
4. Give an example of a typical wetland food chain.
5. Sample a wetland’s plants, soils and hydrology to determine its type.

What is a Wetland?
Wetlands are characterized by:
• hydrology – water at surface for some part of year.
• wet soils
• water-loving plants (sedges, willow, cattails)


Types of Wetlands
· Marsh - mostly water-loving rushes, sedges, grasses, and other
plants growing in the water. May dry up in late summer.
· Swamp - mostly water-loving shrubs and trees
· Pond - open bodies of water less than 20 acres in size, with some
floating vegetation around edges.
· Bog (acidic) – receives only precipitation, characterized by sphagnum moss and floating mat of vegetation, as well as, bog rosemary, bog laurel, labrador tea, and black spruce.

· Fen (less acidic and more alkaline) – receives ground and surface water inflows, characterized by sphagnum moss, sedges, woody shrubs, and may have floating mat of vegetation

· Vernal pond that results from spring runoff that eventually evaporates in summer)


Characteristics of Major Wetland Types

Characteristic

Swamp

Marsh

Fen

Bog

 

Vegetation

 

trees

large shrubs

 

grasses

sedges

 

grasses

sedges

shrubs

trees

 

mosses

herbaceous

trees

shrubs

 

 

Hydrology

 

 

Receives precip & surface and groundwater

 

 

Receives precip & surface and groundwater

 

Receives precip & groundwater

 

Ombrotrophic*

(fed only by precip)

 

Soil

 

 

mineral

organic (old)

 

 

mineral

 

organic (peatlands)

 

organic

(peatlands)

 

pH

 

basic

neutral (7.0)

acidic

 

neutral

 

Basic to slightly acidic

(pH ~ 6.0-9.0)

 

acidic

(pH < 5.0)

 

Trophic

State

 

 

oligo-eutrophic

 

meso-eutrophic

 

meso-eutrophic

 

oligotrophic


Wetland Functions
· Act like giant sponges to soak up water, reduce floods, and recharge groundwater.
· Provide resting place for migrating birds.
· Filter out pollutants, trap sediments, and improve water quality.
· Provide water, food, protective cover and breeding areas for wildlife.
· Reduce soil erosion by slowing runoff from storms and spring runoff.
· Provide nursery areas and protection for fish.
· Supply shade, water, and forage for livestock.
· Act as carbon sinks, helping to keep atmospheric carbon in balance (reduce global warming).
· Supply agricultural products: cranberries, peat, blueberries
· Provide recreational, educational, and scientific opportunities.

Wetland Functions Activity (Wetland Metaphors in WOW! The Wonders of Wetlands , p. 85)

Wetlands help wildlife and people in lots of different ways. Play Put different objects listed below into a bag. Explain what a metaphor is. Hand out objects one at a time to groups of 2-3 students, and ask them to explain how each object represents what a wetland is or does.

Sponge = soaks up water, helps prevent floods, adds to groundwater.

Pillow = resting place for migrating birds. Wetlands are like MOTELS for migrating birds.

Egg beater = mixes nutrients and oxygen into the water.
Strainer = strains out dirt; keeps water clean.
Coffee filter = filters out pollution; keeps water clean.
Antacid = takes away (neutralizes) effect of acid rain.
Wild rice or cereal = provides food for wildlife and people. Wetlands are like RESTAURANTS
for wildlife.

Soap = helps clean the environment.
Baby bottle = wetlands are NURSERIES for raising baby insects (larva) and baby animals
because there are lots of plants for hiding/shelter, food, and water nearby for drinking.

Wetlands Provide Habitat for Many Plants & Wildlife
List the four parts of habitat?
• food • water • • shelter • space
These must be in the proper amounts and arrangement for each type of plant or animal, i. e. . too much water v. too little water. Different animals have different needs for space, i. e. bear v. ant.


Many different kinds of plants and animals live in a wetland habitat:
frogs turtles birds beaver alder cattails
tadpoles fish insects moose willow sandhill crane
sedge water lily algae duck weed heron Canadian geese
(encourage students to research additional plants and animals that live in wetlands)

Food Chains in Wetlands

Design a food chain for a wetland:

phytoplankton — zooplankton — insect larva — frog — heron/snake


Wetland Sampling Activity

Materials/Equipment Needed:
Shovel or soil auger
pH and dissolved oxygen water chemistry kits or probes
Meter stick
Plant ID books
Ziploc bags
Data forms

Procedure
Organize students into groups to:
· Test the pH and dissolved oxygen of the water.
· Describe soil.
· Measure depth to groundwater.
· Identify plants
· Determine wetland type
· Delineate wetland boundaries?

Assessment: need to add

Summary
Rephrase objectives as questions.


Field Trip Rules:
1. This pond is home to lots of animals.
Treat the pond the way you’d want a stranger to treat your special place. Don’t walk in it! It makes the water all murky— hard for us to see critters and hard for them to see their food.

2. This pond is a nursery for young animals.
Be careful with the animals that you collect so you don’t injure them.
• Don’t handle them with your hands.
• Put all animals back in the water when you are through.

3. These animals need water.
All collected animals must be placed in a container with water ASAP.

4. Be careful of equipment.
Rinse all nets and containers when you’re through. Anyone not being safe and careful with equipment will lose it.


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Last Update: May28, 2003

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