Status and trends of wetlands in the coastal watersheds of the eastern united states
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Status and Trends of Wetlands in the Coastal Watersheds of the Eastern United States PowerPoint PPT Presentation


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Status and Trends of Wetlands in the Coastal Watersheds of the Eastern United States. Susan-Marie Stedman, NOAA Fisheries Service Tom Dahl, US Fish and Wildlife Service. Some Background…. National Wetlands Trends (US FWS) Time Periodacres/year net change 1955-1975-458,000

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Status and Trends of Wetlands in the Coastal Watersheds of the Eastern United States

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Status and Trends of Wetlands in the Coastal Watersheds of the Eastern United States

Susan-Marie Stedman, NOAA Fisheries Service

Tom Dahl, US Fish and Wildlife Service


Some Background….

National Wetlands Trends (US FWS)

  • Time Periodacres/year net change

  • 1955-1975-458,000

  • 1973-1983-290,000

  • 1986-1997 -58,550

    ------------ “No net loss”

  • 1998-2004 +32,000


“Coastal” Wetlands Trends

Gosselink and Bauman, 1980 (mostly tidal wetlands)

  • 1922-1954: 19,000 ac/yr loss

  • 1954-1974: 46,000 ac/yr loss

    Brady and Flather, 1994 (mostly tidal wetlands)

  • 1982-1987: 19,000 ac/yr loss

    Brady and Goebel, 2002 (wetlands in coastal counties)

  • 1992-1997: 32,600 ac/yr loss


Coastal Wetlands are Important as:

Habitat for commercial and recreational fish

98% of Chesapeake Bay commercial landings and

97% in the Gulf of Mexico are estuarine-dependent

Habitat for waterfowl

majority of black ducks winter on Atlantic coast

majority of gadwalls winter along Gulf Coast

Protection from coastal

storms and floods - $23B/yr

Recreation

And more………


Defining “Coastal”


Coastal Wetlands are….

  • Salt marshes

  • Brackish marshes

  • Fresh tidal marshes

  • Fresh tidal scrub/scrub

  • Tidal riverine

  • As well as….

  • Non-tidal fresh wetlands


Total coastal drainage area: 212.6 million acres

Data segmented by coastline – Great Lks., Atlantic, Gulf

Sample plots:

2,265 (48 % of national total)

Field verification plots: 824 (36%)

National data points vs. Coastal data points


Coastal Wetlands Status 2004


Coastal Wetlands Trends 1998-2004(including Great Lakes)

  • Average annual net loss of 60,000 acres per year

  • Freshwater wetlands experienced 82% of that loss

  • About 70% of the loss was due to development

  • The Gulf of Mexico experienced the majority of the wetland loss


Gains and Losses by Coastal Region


Agriculture, 3.6%

Deepwater, 14.5%

Intertidal

Wetlands,

0.05%

Urban & Rural

Development

22.4%

OtherDevelopment

Activities, 59.4%

Attribution of fresh water wetland losses: Atlantic, Gulf of Mexico, and Great Lakes


Gulf Coast – Wetland Change Regions


Coastal development


Coastal development


Attribution of saltwater wetland losses – Atlantic and Gulf Coasts


Atlantic Coast Inundation Regions


Focus on Coastal Areas

Coastal watersheds of the eastern coterminous US:

  • Have 12% of the land area

  • Have 38% of the wetlands

  • Have >50% of the people

  • Support about 70% of the fish landings

  • Experienced approximately the same average annual net wetland loss from 1998-2004 as the entire coterminous US from 1986-1997


Conclusions:

  • Although wetland loss has reversed on a national basis, it continues at an alarming rate in coastal areas.

  • Coastal areas need greater efforts to reverse the trend of continuing wetland loss.


What next?

  • Can we increase coastal wetland conservation through existing programs?

  • Do we need new programs focused on coastal wetlands?

  • How can we quantify coastal wetland trends on the Pacific coasts?


Questions?


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