PASCO ME-6937 Aquatic Productivity Bottles - Manual (Page 4)

M o d e l N o . M E - 6 9 3 7 S a m p l e D a t a
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Table 1: Dissolved Oxygen and Productivity at Various Light Intensities
Data Analysis
1. Calculate the respiration rate (R) for your group's algae solution and record in Table 1. R equals the total amount
of dissolved oxygen consumed in the bottle that received no light (0% bottle), since there was no photosynthetic
activity in that bottle. So:
R = Initial DO concentration - Final DO concentration (0% bottle).
2. Calculate the net primary productivity (NPP) of the algae in each of your group's bottles and record in Table 1.
NPP = Final [DO] of bottle - Initial [DO] of bottle
3. Calculate the gross productivity of the algae in each of your group's bottles.
GPP = NPP of bottle + R
Sample Data
Table 1: Dissolved oxygen at varying light intensities
Light Intensity Initial [DO]
(mg/L) Final [DO]
(mg/L) Respiration
Rate (mg/L) Net Primary
Productivity (mg/L) Gross Primary
Productivity (mg/L)