AP_Bio_-_Primary_Productivity_Lab

AP_Bio_-_Primary_Productivity_Lab - • % saturation or...

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Primary Productivity in Aquatic Ecosystems Dissolved Oxygen Lab
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Dissolved oxygen Can be measured in absolutes (how much O 2 is actually in the water) or by % saturation % saturation - measure of DO compared to how much DO COULD be in the water Higher temp is capable of holding less than cold
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There are 2 samples, each containing 7 ppm DO. One is at 4 deg C, the other is at 27 deg C. Which has a higher % saturation? Why?
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Our setup 10 water sampling bottles filled with pond water 2 were put in each condition: refridgerator, incubator, dark cabinet, under a grow lamp The last 2 were “fixed” so our initial DO level could be measured later Wait 24 hours, then measure DO levels from each sample.
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How saturated was our initial sample? 100% + sat (there were visible bubbles coming out) What will impact the final DO levels in each sample? How should we compare the change in DO as a result of each of these?
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Unformatted text preview: • % saturation or absolute levels (ppm)? Closer look at these “biological processes” • Primary productivity – rate at which organic materials are stored in a system – Gross pri prod = measures how much is made – Net pri prod = how much is made – how much is used • Which of these are impacted by photosynthesis? Respiration? To calculate productivity • Determine change in DO in ppm. • Convert to mg carbon fixed / L Data collection / Analysis & conclusions • Determine DO in assigned sample, report on board (copy all group data by the end) Analysis & conclusions Determine % sat for each sample; Graph how temp affects % sat; explain what your graph shows Determine net & gross prod in light/dark sample. Show your work. Predict how these would change if there was a third sample receiving moderate light. Copy & answer ques 5-8 from lab handout (pp 143-144)...
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This note was uploaded on 11/16/2011 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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AP_Bio_-_Primary_Productivity_Lab - • % saturation or...

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