1. Understanding Impacts of Environmental Change on Lake Champlain Water Quality Andrew Schroth

2. 20th Century Environmental Change Preserved by Lake Sediments
2010
20th Century Eutrophication:
Increasing Carbon, Phosphorus,
Bloom Indicators
Ag. Intensification ~1970
(Missisquoi Basin)
Urbanization ~1960
(St. Albans)
Sewer Expansion ~1900
(St. Albans)
Europeans Arrive 1690

3. Changes Revealed by Long-Term Monitoring Program 1992-present
Detected Change:
Decreasing River N
Increasing River P
Decreasing Wind
Increasing Discharge
Increasing Temp.
Lake Response:
Total N
Total P
TN:TP
Bottom Line:

4. Conceptual Model from Long-Term Monitoring: Opportunities to Prioritize and Partition Efforts!
Most sensitive to internal nutrient loading and changes that impact that process
Control sediment P input and manipulate conditions/composition of lake sediments
Most sensitive to changes in river dissolved nutrient concentrations
Focus on suppressing dissolved nutrient loading from rivers

5. High frequency monitoring tells us more about agents and impacts of change
Algal Blooms
Environmental Conditions(weather, lake physics, chemistry)
Combinations of biological, physical, chemical sensors allow us to understand the complex relationship between weather, lake and river flow, chemistry and biology and drivers of change

6. Thank You!
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