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DNR: Why wetlands are vital to Michigan's environment
While many wildlife species find homes in Michigan’s wetlands, many people find recreation destinations there. This includes waterfowl hunting – Michigan regularly ranks in the top three states for Canada goose harvest and hunters in the nation ...
During the past 200 years, about half of Michigan's original wetlands have been drained and filledMichigan DNR explains why the remaining habitat is a state treasure.
BY CASEY WARNER / Michigan Department of Natural Resources
When thinking about Michigan’s important, valuable landscapes, many of us first think of the Great Lakes, northern forests and sandy beachesWetlands might not immediately come to mind.
They certainly didn’t for early Michigan settlers, who were less than impressed with the state’s abundance of swamps and marshes – more than 10 million acres of wetlands before European settlement.
“The banks of the Detroit River are handsome, but nine-tenths of the land in the Territory is unfit for cultivation,” said General Duncan McArthur, stationed at Fort Detroit, in 1814.
The 1816 Tiffin Report by Edward Tiffin, surveyor general of the United States, had equally disparaging things to say about Michigan’s land and agricultural potential, including: “Michigan apparently consisted of swamps, lakes, and poor, sandy soil not worth the cost of surveyingNot more than one acre in a hundred, or perhaps a thousand, could be cultivated.”
In the two centuries that followed, about half of Michigan’s original wetlands have been drained and filled.
“Michigan was once considered a mosquito-infested, godforsaken swamp, and wetlands were drained to establish roads and agriculture and build communities,” said Steve Shine, who coordinates wetland mitigation banking – the process of establishing new wetland areas before development or other projects impact existing wetland areas – for the Michigan Department of Natural Resources“This historic conversion of wetlands has made Michigan what it is today, but now we’re focused on restoring wetlands to replace those impacted by agriculture, public works projects and development that are also important to the state.”
Today, we recognize the value of wetlands, even celebrate them with observances like American Wetlands Month in May, and the need to conserve them.
“Michigan residents, whether they know it or not, have a strong connection to our state’s wetlands and the waterfowl that rely on them,” said Barb Avers, DNR waterfowl and wetland specialist“Some go duck hunting every year, while others sit on their back porches and watch the annual fall waterfowl migrationsAnd many citizens get clear drinking water from groundwater purified by Michigan’s wetlands.”
In 1979, the Michigan legislature passed the state’s wetlands protection statute, which recognizes the benefits and important functions and values provided by wetlandsAdministered by the Michigan Department of Environmental Quality, Michigan’s wetlands protection statute requires permits for construction activities in wetlands.More than half of Michigan’s wetlands, like this one, have been lost over the past two centuries.
What exactly is a wetland?
Michigan law defines a wetland as “land characterized by the presence of water at a frequency and duration sufficient to support, and that under normal circumstances does support, wetland vegetation or aquatic life, and is commonly referred to as a bog, swamp, or marsh.”
More simply put, wetlands are areas where land and water meet.
They are characterized by the presence of water that saturates the soil or covers the land for some or all of the year, which leads to the development of plant and animal communities adapted to these conditions.
The three major types of wetlands are marshes, which have standing water from less than an inch to several feet deep and might be called flooded grasslands; swamps, dominated by woody plants and best described as flooded woodlands or shrublands; and bogs, which occur where accumulations of decaying vegetation form mats that eventually cover and then fill in old ponds or lakes.
Wetlands play a critical role in managing Michigan’s water-based resources, providing flood storage, groundwater recharge, wildlife habitat, pollution treatment, erosion control and nutrient uptake.
Wetlands are a significant factor in the health and existence of Michigan’s other natural resources, such as inland lakes, groundwater, fisheries, wildlife and the Great Lakes.
Wetlands are “like nature’s kidneys,” Avers said, in that they filter pollutants from surface runoff, trapping fertilizers, pesticides, sediments and other contaminants, helping to break some of them down into less harmful substances, improving water clarity and quality.
They also replenish surface and underground drinking water sources.
Home to a wide variety of birds, including the secretive sora, Michigan’s wetlands make great wildlife viewing destinations.“ Wetland soils help to filter pollutants and excess nutrients out of the water to create a cleaner water supply for all of us,” said Holly Vaughn, DNR wildlife communications coordinator“They also provide important flood control, acting like sponges to soak up extra rain and storm water.”
Wetlands are vital to Michigan’s wildlife as wellAcre for acre, they produce more wildlife and plants than any other Michigan habitat type.
“About 25 percent of mammals, 50 percent of birds, nearly all reptiles, and every amphibian in Michigan use wetlands,” said AversAvers added that, although wetlands make up only 5 percent of the area of the contiguous US., more than a third of threatened and endangered species live only in wetlands.
“Wetlands provide excellent benefits to wildlife, including important migratory stopover habitat for waterfowl and migratory songbirds too,” Vaughn said.
While many wildlife species find homes in Michigan’s wetlands, many people find recreation destinations there.
This includes waterfowl hunting – Michigan regularly ranks in the top three states for Canada goose harvest and hunters in the nation, and in the top 10 for average annual sales of federal duck stamps – and a variety of other outdoor pursuits.
“Michigan has exceptional wetland recreation opportunities,” Vaughn said“Among the best of them, our Wetland Wonders ( the DNR’s managed waterfowl areas) offer great waterfowl hunting, wildlife viewing, trapping, hiking, fishing and boating.”
Those recreation opportunities lead to significant economic impact.
“Wetlands are important for the state’s economy,” said Avers“Waterfowl hunting trips, which take place largely in wetland areas, generate $ 22 million each year in MichiganFish, wildlife and recreational activities related to Michigan’s coastal wetlands generate $52 million annually.”Waterfowl hunting trips, which take place largely in wetland areas, generate $22 million each year in Michigan.
Avers added that renowned waterfowl and coastal wetland areas like Saginaw Bay, StClair Flats and the Detroit River have built and supported local economies and communities with industries such as duck decoys, boats and hunting clubs.
“Great Lakes coastal wetlands are highly productive and rare ecosystems, and are widely recognized as vital to the overall Great Lakes ecosystem, providing habitat for migratory waterfowl, wading birds, sport and forage fish, amphibians and reptiles, and many other native wildlife,” said Anne Garwood, DEQ Great Lakes coastal wetland ecologist“In some parts of the state, where up to 90 percent of Michigan’s coastal wetlands have been lost, the protection and restoration of coastal wetlands is especially critical.” Although now recognized for their importance to wildlife, people, the environment and the economy – and with laws in place that have helped slow their loss – wetlands still face threats.
These threats include invasive species, climate change and declining Great Lakes water levels, and demand for development on existing wetlands.
“More than 50 percent of Michigan’s historic wetland base has been lost, and the rate of wetland loss in key waterfowl landscapes exceeds 90 percent,” said Avers“We need to do more to conserve Michigan’s wetlands and our great waterfowl heritage.”
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