What is the main global reservoir of nitrogen?

True or False: Most of the net primary productivity that is consumed is used for growth by primary consumers. Explain.

Which of the following is the longest-lived reservoir for carbon? a. atmospheric CO2 b. marine plankton (primary producers and consumers) c. fossil fuels d. wood

In a model of the carbon cycle, how would you label an arrow from the atmosphere to plants?

a. cellular respiration

b. photosynthesis

c. decomposition

d. consumption

If the GPP of a grassland is 5000 kcal/m2/year and 55 percent is used up by cellular respiration, what is the NPP? a. 2250 kcal/m2/year b. 2750 kcal/m2/year c. 5000 kcal/m2/year d. need more data

Explain why decomposition rates in a field in Nebraska would differ from the decomposition rates in a field in the Amazon. How do decomposers regulate nutrient availability in ecosystems?

Why are the open oceans nutrient poor? Why are coastal areas and intertidal habitats relatively nutrient rich?

Explain why it is more energy efficient (in terms of the amount of total NPP required) to eat a pound of tofu (bean curd) than a pound of hamburger.

Researchers use models like the business-as-usual model to examine the possible effects of climate change on both terrestrial and aquatic ecosystems. These models are not predictions of our future, but instead allow us to make decisions now to avoid future problems. Provide examples of how society should change to reduce the impact of climate change on our oceans.