To test how predicted increases in nitrogen deposition might affect species rich

Question

To test how predicted increases in nitrogen deposition might affect species rich temperate grassland ecosystem, researchers set up the following experiment: control plots received normal levels of nitrogen, whereas experimental plots received elevated nitrogen. At the end of the growing season, the researchers measured aboveground plant biomass (an index of net primary production, NPP; p = 0.010) and plant species diversity (1/D; p = 0.027) in multiple plots. Answer the following questions

6. Why is this type of analysis best for these data?

A) multiple independent variables

B) multiple dependent variables

C) both A and B

D) none of the above

7. Which of the following is NOT an assumption of this type of analysis?

A) means are equal

B) variances are equal

C) data are normally distributed

D) data are independent

8. These data suggest that increasing nitrogen deposition in this system will lead to __________ productivity and __________ diversity.

A) no change in; no change in

B) no change in; lower

C) higher; no change in

D) higher; lower

9. Is there evidence that nitrogen is a limiting nutrient in this ecosystem?

A) yes, because adding more limits NPP

B) yes, because adding more limits species diversity

C) yes, because adding more increases NPP

D) no

Explanation / Answer

A) multiple independent variables.

D) data are independent

D) higher; lower.

A) yes, because adding more limits NPP

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