Now suppose that this alga begins to die off en masse. This causes the algae to

Question

Now suppose that this alga begins to die off en masse. This causes the algae to sink to the bottom of the lake. Which of the following may be a possible immediate effect of this? A. The amount of nitrogen and phosphorous will increase. B. The number of heterotrophs will increase due to an increase in nutrient availability. C. The levels of dissolved oxygen will begin to decrease. D. The number of heterotrophs will decrease due to lack of oxygen. Now suppose that this alga begins to die off en masse. This causes the algae to sink to the bottom of the lake. Which of the following may be a possible immediate effect of this? A. The amount of nitrogen and phosphorous will increase. B. The number of heterotrophs will increase due to an increase in nutrient availability. C. The levels of dissolved oxygen will begin to decrease. D. The number of heterotrophs will decrease due to lack of oxygen.

Explanation / Answer

c. The levels of dissolved oxygen will begin to decrease because

Dissolved oxygen concentrations may change dramatically with lake depth. Oxygen production occurs in the top portion of a lake, where sunlight drives the engines of photosynthesis. Oxygen consumption is greatest near the bottom of a lake, where sunken organic matter decomposes.

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