Approaches to Golden Algae Control: In-Lake Mesocosm Experiments
2012
Roelke, Daniel L | Brooks, Bryan W | Grover, James P | Kalisek, Danielle M | Harris, Bill L
Prymnesium parvum, a haptophyte alga, occurs worldwide. It is tolerant of large variations in temperature and salinity, and is capable of forming large fish-killing blooms. In the United States, the first recorded P. parvum bloom occurred in 1985 in a semi-arid region of the country (Pecos River, Texas). Since then, the reported incidence of P. parvum blooms dramatically increased in the United States, where the organism has invaded lakes and rivers throughout southern regions and most recently has moved into northern regions. Fortunately, P. parvum population dynamics are influenced by several factors that may serve as tools for management. These include hydraulic flushing, pH, and ammonia additions. This report documents in-lake enclosure experiments conducted during periods of bloom initiation, and bloom development and decline. Three approaches are demonstrated to have promise in controlling blooms in localized areas of lakes. Most promising were manipulations involving pulsed hydraulic flushing (30% water exchange once per week using water deeper in the lake); the neutralization of ambient waters (lowering pH to 7); and ammonia additions (elevating to 40 microM).
Afficher plus [+] Moins [-]The original document contains color images. Prepared in cooperation with Center for Reservoir and Aquatic Systems Research, Waco, TX, and University of Texas at Arlington, Arlington, TX.
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