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Legacy Phosphorus and Harmful Algal Blooms in Lake Erie

Legacy Phosphorus and Harmful Algal Blooms in Lake Erie

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Background: NCWQR Monitor<strong>in</strong>g<br />

Rais<strong>in</strong><br />

<strong>Lake</strong> <strong>Erie</strong><br />

Ontario<br />

Vermilion<br />

Gr<strong>and</strong><br />

Indiana<br />

Michigan<br />

Ohio<br />

<strong>Lake</strong><br />

<strong>Erie</strong><br />

Pennsylvania<br />

New York<br />

Maumee<br />

S<strong>and</strong>usky<br />

Cuyahoga<br />

N<br />

0 40 80 120 Kilometers<br />

W<br />

E<br />

S<br />

Autosamplers at USGS stations, 3 samples per day<br />

Sediment, nutrients, major ions<br />

1974 to present, ~15,000 samples per station<br />

Recent extensive soil test<strong>in</strong>g <strong>in</strong> S<strong>and</strong>usky watershed

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