Enzyme Activity Associated with Periphyton Sample Clauses

Enzyme Activity Associated with Periphyton. A variety of units are used to present both enzyme activity and periphyton growth. Slide periphyton chlorophyll levels were low at all three locations in the PSTA Cell (Figure 52). Areal biomass on a dry weight was similar across sites, while AFDW biomass suggested higher periphyton biomass in the inflow region, as compared to the outflow region. Enzyme activity was higher in assays of the inflow periphyton than outflow periphyton, when normalized to units of chlorophyll in the same sample. Relative to epiphyte dry weight, enzyme activity in the dry season (January 2014) slide periphyton was higher at inflow and outflow stations than in the middle portion of the cell (Figure 52). This trend was also evident in periphyton on Chara sampled the same month (Figure 53). When the comparison between inflow, middle, and outflow regions of the cell is broadened to include all available periphyton substrates, enzyme activities per epiphyte dry weight showed a slight increase with distance through the cell, for both APA and PDE enzyme classes (Figure 54). Periphyton Chlorophyll a (µg/cm2) 0.5 50 Volatile Solids (%) 0.4 40 0.3 30 0.2 20 0.1 10 0.0 APA per unit Chlorophyll a (µmol MUF released /µg chl a/hr) 0.5 Areal Biomass (mg/cm2) 0.4 0.4 0.3 0.3 0.2 0.1 0.0 APA in Slide Periphyton (µmol MUF released /g epiphyte/hr) 150 0.0
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