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.

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Presentation transcript:

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.

 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.

Weather conditions  Mostly overcast  Steady wind  ~60 degrees F  Choppy waves

Averages  Temp C  Cond uS/cm  DO% %  DO conc mg/L  pH  Turbidity  Chlorophyll- 1.61

Turbidity vs. Depth

Dissolved Oxygen

Chlorophyll vs. Depth

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

Macrophytes  Elodea  Myriophyllum  Utricularia  Ceratophyllum  Potamogeton- crispus and pectinatus  Cladophera

Silica SilicaConc.Absorb. HYPO META EPI

Phytoplankton- Epi

Phytoplankton- Meta

Phytoplankton-Hypo

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.

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.