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March 3, 1993

Status and population trends of Hawaii's native waterbirds, 1977-1987 Status and population trends of Hawaii's native waterbirds, 1977-1987

Status and population trends of Hawaiis ’ native waterbirds were examined from 1977 through 1987. Waterbird population fluctuations were analyzed in relation to rainfall and land use dynamics. Numbers of Hawaiian Duck (Koloa) (Anus wyvilliana) and Hawaiian Common Moorhen (Gallinula chloropus sandvicensis) appeared stable over time; however, surveys were limited. Increase in Black-crowned...

Authors

Andrew Engilis, Thane K. Pratt

Ecosystems Mission Area, Pacific Island Ecosystems Research Center

January 1, 1992

Trophic interactions and direct physical effects control phytoplankton biomass and production in an estuary Trophic interactions and direct physical effects control phytoplankton biomass and production in an estuary

San Francisco Bay has recently been invaded by the suspension-feeding clam Potamocorbula amurensis. Previous work has shown that phytoplankton biomass in the upper estuary is low (2-3 mg Chl a m-3) during seasonal periods of high river flow and short residence time and it is usually high (peak >30 mg Chl a m-3) during the summer-autumn seasons of low river flow and long residence time...

Authors

A.E. Alpine, J. E. Cloern

Ecosystems Mission Area, Water Resources Mission Area, Pacific Island Ecosystems Research Center, California Water Science Center