1. To measure primary production of algae in a stream, you place two sealed cham
ID: 57203 • Letter: 1
Question
1. To measure primary production of algae in a stream, you place two sealed chambers in the stream, each enclosing the sediments as well as the water above them. One chamber is covered with black tape (blocking all light) while the other is transparent to light. You measure dissolved oxygen (DO) before and after a 24-hour incubation. DO in the light chamber increases by 30 mg/m2 while DO in the dark chamber decreased by 10 mg/m2. What is the estimated Re for the stream? mg O2 m-2 day-1 2. What is the stream's esitmated NEP? mg O2 m-2 day-1 3. Based on these data, what was the stream's GPP? mg O2 m-2 day-1
4. The position of Earth's continents has shifted dramatically over its history. Imagine that all of Earth's land mass was bunched together with approximately equal areas above and below the Equator. Assume that seasonal patterns of growth and respiration are otherwise similar, with the Northern Hemisphere's summer occurring June-August and the Southern Hemisphere's summer occurring December-February.
Explanation / Answer
4. Ans: The seasonal swings would be much smaller may be undetectable.
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