Q5. As you saw in \"DO or Die\", adding nutrients to a lake has direct effects (

Question

Q5. As you saw in "DO or Die", adding nutrients to a lake has direct effects (such as stimulating the growth of phytoplankton) and indirect effects throughout the community (such as drastic effects on fish populations). Suppose you triple (3x) the phosphorus input in a lake where phosphorus is limiting, and phytoplankton populations grow dramatically. Based on your observations, which of the following predictions is most likely to follow the phytoplankton bloom?

Decomposition decreases, DO increases, fish populations grow, and zooplankton abundance increases.

Decomposition increases, DO decreases, fish populations die off, and zooplankton abundance increases.

Decomposition increases, DO decreases, fish populations grow, and zooplankton abundance decreases.

Decomposition increases, DO increases, fish populations die off, and zooplankton abundance decreases.

Explanation / Answer

B) Decomposition increases, DO decreases, fish populations die off, and zooplankton abundance increases-

As adding phosphorus, growth rate of phytoplanktons and algae icreases high, phtoplanktons form a mat kind of thing on the surface of lake which cases limiting sunlight and oxygen for middle and bottom of the lake, then the deay process starts by zooplanktons which breaks the organic material in to CO2 which requires oxygen, and quickly a hypoxic environment created inside the lake that cause fish population die off.

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