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Onondaga Lake

Onondaga Lake. Backround. Onondaga Lake was once a major tourist destination. A long history of pollution quickly led to its decline. Today it is one of the most polluted lakes in this region, but scientists are working to restore its natural beauty.

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Onondaga Lake

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  1. Onondaga Lake

  2. Backround • Onondaga Lake was once a major tourist destination. A long history of pollution quickly led to its decline. • Today it is one of the most polluted lakes in this region, but scientists are working to restore its natural beauty.

  3. One of the major pollutants was Mercury, stemming from industrial discharge from a local manufacturer. • In addition, inadequate sewage treatment facilities allow untreated sewage to be drained into the lake. • In the summer, this causes algae blooms and an anoxic hypolimnion.

  4. Weather conditions • Mostly overcast • Steady wind • ~60 degrees F • Choppy waves

  5. Averages • Temp. - 15.77 C • Cond. - 2152.05 uS/cm • DO% - 57.13% • DO conc.- 5.314 mg/L • pH- 7.59 • Turbidity- 14.87 • Chlorophyll- 1.61

  6. Turbidity vs. Depth

  7. Dissolved Oxygen

  8. Chlorophyll vs. Depth

  9. Physical Parameters • Secchi disk: range: 853-2 A significant drop occurred when the spherical dropped just below the surface, then again when it was lowered to two meters.

  10. Macrophytes • Elodea • Myriophyllum • Utricularia • Ceratophyllum • Potamogeton- crispus and pectinatus • Cladophera

  11. Silica

  12. Phytoplankton- Epi

  13. Phytoplankton- Meta

  14. Phytoplankton-Hypo

  15. Zooplankton • Tow one and two both returned 9 species each. • Minor differences were that Cercopagis was found only in the first tow. • Conochilus was found only in the second tow.

  16. Zooplankton cont’d. • Schindler Trap • Hypo yielded 6 species, 78 individuals total • Meta – 4 species, 94 individuals total • Epi – 5 species, 7 individuals sub sample 1, 10 individuals sub sample 2.

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