MONROE, Mich. (AP) — Honking geese soar overhead in a V
formation, buffeted by bitter gusts off nearby Lake Erie, while flocks
of mallards bob along the shore. Even blanketed in snow, the sprawling
wetland in southeastern Michigan is a magnet for water birds — one
reason a public-private project is underway to improve it.
Crews
are building levees, canals and pumps that will regulate water levels
and upgrade fish passageways in a 946-acre section of Erie Marsh, making
it a better home for wildlife and limiting the spread of invasive
plants.
It’s an example of decades-old efforts by government
agencies and private groups to rebuild Great Lakes coastal wetlands such
as swamps, bogs and marshes that have been depleted by development. A
federal report released in November suggests the work is beginning to
pay off.
The eight-state Great Lakes region — extending from
western New York to eastern Minnesota— was the only section of the U.S.
where coastal wetland acreage increased during a five-year period when
scientists took extensive measurements with satellites and field
photography.
The gain was modest — 13,610 acres, an area not quite
as large as the New York City borough of Manhattan. Yet it happened as
the rest of the nation’s coastal wetlands shrank by 360,720 acres. The
loss amounted to less than 1 percent of the U.S. total, but continued a
longtime negative trend.
Wetlands don’t have the cachet of
spectacular natural features that oceans and mountains do. They’re
sometimes dismissed as worthless, especially by those wanting to cover
them with shopping centers or highways. But they are immensely valuable,
helping prevent floods by absorbing excessive rainwater. They are known
as "nature’s kidneys," filtering out pollutants that otherwise would
wash into lakes and rivers, and also provide vital wildlife habitat —
nesting grounds for ducks and geese, temporary refuges for migratory
birds, spawning areas for fish.
Scientists say the continental
U.S. has lost roughly half the wetland acreage that existed prior to the
European settlement era. They’ve been relentlessly filled and drained
for farms, housing and cities.
The biggest losses from 2004-09,
the period covered by the study, were along the Gulf of Mexico, where
coastal wetlands form a crucial buffer against storm surge floodwaters
during hurricanes. They have been battered by decades of erosion and
salt water intrusion caused largely by flood-control projects and
development. Atlantic coast acreage also dropped substantially.
Replacing
wetlands is a primary goal of an Obama administration program called
the Great Lakes Restoration Initiative that is focusing on the region’s
biggest environmental problems. Separately, the U.S. and Canada signed
an agreement last year to upgrade the lakes’ water quality that calls
for boosting wetlands.
"If there’s a cure-all for the Great Lakes,
wetland restoration is just about the highest on the list as anything
gets," said Cameron Davis, a senior adviser with the U.S. Environmental
Protection Agency.
Experts say the gains in the Great Lakes region
reflected in the study resulted partially from a prolonged drop in
water levels, which created new wetland areas as vegetation sprouted
along shorelines in places that had been submerged. Some of that acreage
could disappear if the lakes rise again in coming years, said Tom Dahl,
a scientist with the U.S. Fish and Wildlife Service and one of the
report’s authors.
Great Lakes coastal wetlands also face
continuing development threats. Many are along shorelines that would be
prime locations for hotels or condominiums. Regulations designed to
protect them have drawn legal challenges from critics who say they
stifle economic growth and violate property rights.
"It’s
important to make sure that we don’t resume losing wetlands to a greater
extent than we can restore them," said Susan-Marie Stedman, a NOAA
biologist who wrote the national report with Dahl.
As those
battles continue, other government programs encourage voluntary wetlands
restoration through means such as flooding unused cropland. The U.S.
Department of Agriculture’s Natural Resources Conservation Service has
worked with landowners to revive over 40,000 wetland acres in Michigan
alone since 1995, spokesman Brian Buehler said.
"Regulations slow
the loss. But if we’re going to turn the tide and have a net gain, we
need to re-establish wetland acres," said Jim Hudgins, who coordinates
such projects for the Fish and Wildlife Service. "We can work with
people to maintain the values and functions of wetlands in ways that
benefit the landowners."
One such project is Erie Marsh, a network
of wetlands, farm fields and open water along Lake Erie’s North Maumee
Bay. The Nature Conservancy bought the property from a private hunting
club and is working with Ducks Unlimited to improve natural features
that make it hospitable for waterfowl and fish.
Culverts, gates
and other infrastructure are being installed to re-establish a
connection with the bay that was cut off decades ago by construction of
dikes. Group leaders hope the project will be completed by 2017,
enabling fish to reach the wetlands for spawning and foraging.
Farther
up the coast, the Fish and Wildlife Service has bought dozens of acres
of corn and soybean fields that will be partially flooded to create
wetlands and prairie, becoming part of a wildlife refuge covering 48
miles along the Detroit River and Lake Erie.
"You look at it now
and wonder how it could be a wetland," Ducks Unlimited conservation
programs manager Jason Hill said, surveying a snow-covered field on a
recent afternoon. But once the water level rises, it will teem with
swamp vegetation, aquatic birds and critters such as muskrats and snakes
— all within a half-hour’s drive of the Detroit metro area, where
millions rely on the river and the lake for drinking water.
"Having
functioning wetlands in urban areas is good for migratory birds and
endangered species … but it also improves water quality for people,"
Hill said.
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Online:
Federal report: http://1.usa.gov/1cX93qq
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