Coastal Wetland Restoration:

Several wetland-dependent species have become endangered with extinction due to habitat losses of 75% or more of Southern California natural coastal wetlands. While there are many plans to restore degraded wetlands and enhance disturbed estuaries, recent PERL research at (funded by Calif. Sea Grant) has shown that constructed salt marshes do not match the functioning of natural wetlands--even 10 years after construction.

Impacts of non-point source inflows:

Raw sewage entered Tijuana Estuary daily through 1991 and intermittently thereafter. Treatment facilities at the US-Mexico border will be built in 1995. To characterize the water quality at the Tijuana Estuary, NOAA's Marine and Estuarine Management Division funds our long-term studies of estuary biota.

Wastewater Management:

In a region where most of the water supply comes from distant watersheds, irrigation runoff and wastewater spills often enter coastal wetlands, making the normally marine waters brackish. Recent research has sought to determine 1) how much salinity dilution the sensitive estuarine animals can tolerate, 2) how exotic plant invasions respond to lowered marsh soil salinity, and 3) how wastewater wetlands might be used to reduce the problem.

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