three day period (Figure 4- 14c). All other additions 

 increased chlorophyll concentrations compared to the 

 controls. 



Amendment Series 2: April 22, 1997 



Station 66 — All additions showed an increase in 

 chlorophyll compared to the control except phosphate 

 additions (Figure 4-15c). VChile all samples showed a 

 decreasing trend, the chlorophyO enhancements were 

 approximately a 30% increase over the control. 



Station 68 — All additions showed an increase in 

 chlorophyll compared to the control except phosphate 

 additions (Figure 4-15a). The chlorophyll 

 enhancements were approximately doubled compared 

 to the control. 



Station 60 — AH additions showed an increase in 

 chlorophyll compared to the control except phosphate 

 additions (Figure 4-15d). The chlorophyll 

 enhancements were approximately double when 

 compared to the control. 



Station 63 — All additions showed an increase in 

 chlorophyll compared to the control except phosphate 

 additions (Figure 4- 15b). The chlorophyO 

 enhancements were increased by approximately 50% 

 over the control. 



Amendment Series 3: August 7, 1997 



Station 68 — Additions of ammonium, nitrate, silicate 

 and ammomum plus P showed mcreased chlorophyll 

 responses compared to the control (Figure 4-16a). 



(a) Station 68 



6 



« 5 



X 4 -F 



C 



s 



^ 1 



DayO 

 Day 1 

 Day 2 

 Day 3 



(b) Station 63 



14 T 



•ST 12 



i 10 



o 



lI 2 



DayO 

 Dayl 

 Day 2 

 Day 3 



(c) Station 66 



11 



(d) Station 60 



10 - 



7 



3 

 2 - 



1 

 



DayO 

 Day 1 

 Day 2 

 Day 3 



P NH4+P 



•« 6 

 o 



i 5 



£ 2+- 



o 



c 1 4 



DayO 

 Day 1 

 Day 2 

 Day 3 



Figure 4-15: Results from nutrient amendment bioassays for selected stations: April 22, 1997. Chlorophyll 

 response indicated by fluorescence. Each daily value represents the mean of four replicate samples. 



4-16 



W^ater Column Productivity 



