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Energy Flow Through Ecosystems

AP Biology· difficulty 3/5

Gross primary productivity (GPP) is 1000 g C/m^2/yr; producer respiration (R) is 400 g C/m^2/yr.

Producers GPP = 1000 R = 400 Consumers NPP = ?

What is the net primary productivity (NPP) available to consumers?

  • A

    400 g C/m^2/yr

  • B

    1000 g C/m^2/yr

  • C

    1400 g C/m^2/yr

  • D

    600 g C/m^2/yr

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Explanation

NPP = GPP - R = 1000 - 400 = 600 g C/m^2/yr; this is the energy stored as biomass available to higher trophic levels.

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