Approaches to Golden Algae Control: In-Lake Mesocosm Experiments

摘要: Abstract : Prymnesium parvum, a haptophyte alga, occurs worldwide. It is tolerant of large variations in temperature and salinity, capable forming fish-killing blooms. In the United States, first recorded P. parvum bloom occurred 1985 semi-arid region country (Pecos River, Texas). Since then, reported incidence blooms dramatically increased where organism has invaded lakes rivers throughout southern regions most recently moved into northern regions. Fortunately, population dynamics are influenced by several factors that may serve as tools for management. These include hydraulic flushing, pH, ammonia additions. This report documents in-lake enclosure experiments conducted during periods initiation, development decline. Three approaches demonstrated to have promise controlling localized areas lakes. Most promising were manipulations involving pulsed flushing (30% water exchange once per week using deeper lake); neutralization ambient waters (lowering pH 7); additions (elevating 40 microM).