Forecasting a 2-methylisoborneol outbreak in a brackish lake

Area of Science:

• Environmental Science
• Limnology
• Water Quality Management

Background:

• 2-Methylisoborneol (2-MIB) causes earthy/musty odors, degrading water and fishery product quality.
• Few studies address 2-MIB in brackish lakes, crucial for capture fisheries.

Purpose of the Study:

• Examine the relationship between water quality and 2-MIB outbreaks in a brackish lake.
• Develop predictive models for 2-MIB outbreaks in Lake Ogawara.

Main Methods:

• Statistical analysis of long-term monitoring data from Lake Ogawara.
• Logistic regression analysis with 2-MIB presence/absence as the dependent variable.
• Identification of key water quality parameters influencing 2-MIB outbreaks.

Main Results:

• 2-MIB-producing cyanobacteria density increased with low dissolved inorganic nitrogen under relaxed phosphorus limitation.
• Higher salinity and micronutrient concentrations also correlated with increased 2-MIB-producing cyanobacteria.
• Forecasting models achieved high predictive power for 2-MIB outbreaks using early season water quality parameters.

Conclusions:

• Water quality parameters like nutrient levels, salinity, and pH are critical indicators for 2-MIB outbreaks in brackish lakes.
• Early season monitoring of dissolved inorganic phosphate, pH, total nitrogen, total phosphorus, and salinity can forecast 2-MIB outbreaks.