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 SilicaConc.Absorb. HYPO8.76470.171 META13.1470.216 EPI19.1480.278

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 Hypo yielded 6 species, 78 individuals total Meta – 4 species, 94 individuals total Meta – 4 species, 94 individuals total Epi – 5 species, 7 individuals sub sample 1, 10 individuals sub sample 2. Epi – 5 species, 7 individuals sub sample 1, 10 individuals sub sample 2.