Studies shows mixed Great Lakes wetlands data

10 Feb 2014

bogA recently reported study by the National Fish and Wildlife Service of coastal wetlands from 2004-2009, showed an increase in wetland
area of an estimated 13,610 acres, while the Atlantic, Gulf of Mexico, and Pacific coastal regions experienced net wetland losses of 111,960 acres, 257,150 acres and 5,220 acres, respectively.  In fact, the report noted that re-establishment projects had helped with this increase. One such project is the Erie Marsh project, which is part of the  Detroit River International Wildlife Refuge, established in 2001 as North America’s first International Wildlife Refuge.  The refuge includes islands, coastal wetlands, inland marshes, shoals, and riverfront lands along 48 miles of the Detroit River and western Lake Erie.  This video describes the early positive impacts of the Erie Marsh project

A companion FWS report paints a less rosy picture.  That report studied overall wetland gains and losses and concluded that there was a slight decline across the entire continental US including:

  •  a decline in saltwater wetlands by an estimated 84,100 acres, which reflected an accelerating  rate of loss of intertidal emergent wetland with some gains in beach/shore wetlands
  • a slowing decline in freshwater wetlands;
  • and large losses in forested wetlands with an estimated 392,600 acres of forested wetland area lost to upland land use types or deepwater between 2004 and 2009.

A map showing regions with the highest rate of freshwater wetland loss to upland between 2004 and 2009 included the southeastern US and the western Great Lakes and the Dakotas.  In short, while Great Lakes coastal wetlands are growing,  overall regional wetlands might actually be declining in acreage, if not quality.  What the EPA will make of that, given its current review of Michigan’s program is anyone’s guess.

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