The net annual primary productivity of a particular wetland ecosystem is found to be 8,000 kcal/m2 per year. if respiration by the aquatic producers is 12,000 kcal/m2 per year, what is the gross annual primary productivity for this ecosystem, in kcal/m2 per year?
a. 4,000
b. 8,000
c. 16,000
d.20,000
e. 96,000

The gross annual primary productivity for this ecosystem is 20000 kcal/m² per year.  

•The rate at which solar energy is captivated in the molecules of sugar at the time of photosynthesis is known as the gross primary productivity.

Based on the given information,  

•The net annual primary productivity (NPP) of the wetland ecosystem is 8000 kcal/m².  

•Respiration (R) by aquatic producers is 12000 kcal/m².  

Now there is a need to find the Gross primary productivity (GPP),  

NPP = GPP - R

Now putting the values we get,  

8000 kcal/m² = GPP - 12000 kcal/m²

GPP = 8000 + 12000 kcal/m²

GPP = 20000 kcal/m²

Thus, the gross annual primary productivity of the ecosystem is 20000 kcal/m².

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D.20,000

Explanation:

The Gross Annual Primary Productivity for the wetland ecosystem is the amount of carbon taken up by the aquatic producers through photosynthesis.  

Given that: Net Annual Primary Producer is 8,000 kcal/m2 per year, and respiration by the aquatic producers is 12,000 kcal/m2 per year, using the formula NPP = GPP – Respiration, we can determine the Gross Annual Primary Productivity of the wetland ecosystem.

NNP = 8,000 kcal/m2

Respiration = 12,000 kcal/m2

GPP = x

8,000 = x – 12,000 (NPP = GPP – Respiration)

Solve for x:

x = 8,000 + 12,000

x = 20,000 kcal/m2 per year

GPP = 20,000 kcal/m2 per year

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