Chesapeake Bay. The Chesapeake Bay Watershed Largest estuary in the United States.

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Presentation transcript:

Chesapeake Bay

The Chesapeake Bay Watershed

Largest estuary in the United States

Fishing Industry of: No other American estuary has a higher yield Blue CrabOystersStriped BassClams

The Bay Is Not Healthy

Nutrient Pollution Causes Algal Blooms and Fish Kills

Nutrients, Algae and Fish Kills Dead zones appear in the bay where nothing can live Low dissolved oxygen in the water kills fish and other organisms Microbes use the oxygen in the water Detritus is decomposed by microbes, microbe populations boom. Algae die and become detritus (decaying matter) Adding nutrients causes algal blooms In normal ecosystem low nutrient levels keep algae in check Fish kill caused by nutrient build-up, Nanticoke River, Chesapeake Bay, 1992

What causes the excess nutrients? Rivers and tributaries are bringing the nutrients to the Chesapeake Bay: Sewage Farming Factory farms discharge 650 million lbs of chicken manure each year

To Investigate this question you will: Analyze historic and modern day food webs Chart trends in harvesting and ocean health using real data on the Chesapeake Bay Draw conclusions from your analyses and make recommendations for restoring Chesapeake Bay ecosystems Watch a short film about the Chesapeake Bay and discuss your seafood consumption choices

Image Credits 1.Chesapeake Bay: US Coast Guard 2.Chesapeake Bay Watershed: US Department of Agriculture 3.Chesapeake Bay Map: NASA 4.Blue Crab: The Children's Museum of Indianapolis Oyster: David Monniaux Striped Bass: Mike Smedley Clam: Aung/Wikipedia 5.Map: NASA 6.Algal Blooms: Jennifer L. Graham/US Geological Survey 7.Dead Fish: US Geological Survey 8.Hog Farm Waste: USDA Chickens: SRAP Pigs: Farm Sanctuary 9. Longshoreman Atlantic City: Isabella & Carroll Walker Collection/The Norfolk Public Library