Sediments as a non-point source of nutrients to Malibu Lagoon, California (USA)

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Malibu Lagoon is a 7.5 ha (18.5-acre) brackish water coastal lagoon situated at the base of the Malibu Creek watershed in Los Angeles County, California. Land use changes in the Malibu Creek watershed have lead to increased freshwater and nutrient loads to the Lagoon and have resulted in a decline in the Lagoon’s wildlife beneficial uses. In 1996 the Los Angeles Regional Water Quality Control Board (LARWQCB) placed Malibu Lagoon on the federal 303(d) list of impaired water bodies due to the excessive abundance of primary producers (Rhizoclonium hookeri, a green, mat-forming alga, and Ruppia maritima, a submerged aquatic vascular plant) in the Lagoon and associated dissolved oxygen (DO) problems. To reduce excessive primary producer abundance and DO problems in Malibu Lagoon, the U.S. Environmental Protection Agency (USEPA) promulgated a Total Maximum Daily Load (TMDL) to limit nutrient pollution in the watershed.

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