Hudson river peak algal biomass in summer prior to and following invasion of zebra mussel

Range prior to invasion ~40: following invasion 4 µg chl a/L
Organism Algae
Reference Roland, F., & Cole, J. J. (1999). Regulation of bacterial growth efficiency in a large turbid estuary. Aquatic Microbial Ecology, 20(1), 31-328 link p.32 left column bottom paragraph
Primary Source Strayer DL, Powell J, Ambrose P, Smith LC, Pace ML, Fisher DT (1996) Arrival, spread, and early dynamics of the zebra mussel (Dreissena polymorpha) population in the Hudson River estuary. Can J Fish Aquat Sci 53: 1143-1149 link AND Caraco NF, Cole JJ, Raymond PA, Strayer DL, Pace ML, Findlay SEG, Fisher DT (1997) Zebra mussel invasion in a large, turbid river: phytoplankton response to increased grazing. Ecology 78(2):588-602 link
Comments P.32 left column bottom paragraph: "The tidal freshwater portion of the Hudson River Estuary has been particularly well studied regarding food-web dynamics. Phytoplankton primary production is low due to the deep mixing and high turbidity of the system (Cole et al. 1991, 1992). Prior to the invasion of the zebra mussel in 1992, algal biomass reached peak levels in summer of ~40 µg chl a/L. Following the zebra mussel invasion, however, peak chlorophyll levels have not exceeded 4 µg chl a/L (primary sources). Metabolism in the Hudson is dominated by heterotrophic activity, and system respiration exceeds primary production (Howarth et al. 1996, Raymond et al. 1997). Similarly, bacterial secondary production exceeds primary production by a factor of about 5 (Findlay et al. 1991, 1992)."
Entered by Uri M
ID 112566