Figure 9.3. The biomass of phytoplankton in the mid-Hudson region. Shown in A are weekly to bi-weekly data for chlorophyll-a near Kingston, New York (river km 144). In B we show means for the May-October period for each year (hatched bars, errors are SD). The solid line (right-hand Y-axis) shows the water filtration rate of the zebra mussel (Caraco et al., 1997; Strayer, this volume). The filtration rate is expressed as volume per area per time (m3 m-2 d-1), which is the same as md-1.

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