Agricultural and industrial activity have substantially increased the reactive nitrogen content of the atmosphere. To investigate the

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Agricultural and industrial activity have substantially increased the reactive nitrogen content of the atmosphere. To investigate the potential consequences on ecosystems, Stevens et al. (2015) recorded atmospheric nitrogen deposition (kg/ha/yr) and aboveground net primary production (ANPP, in g/m2/yr ), a measure of plant biomass accumulation. Atmospheric nitrogen deposition and log ANPP are plotted below.

log ANPP 6.0 5.5 5.0 4.5  0 5 10 15 20 25 30 Atmospheric N deposition 35

a. What kind of plot is shown in the figure above?

b. Discuss whether these data are appropriate for linear correlation analysis. Why or why not?

c. What method would you recommend using to determine whether atmospheric nitrogen deposition and log ANPP are correlated?

d. Computer optional: Using the data available on the book website, use the method you identified in part (c) to test if these two variables are correlated.

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The Analysis Of Biological Data

ISBN: 9781319226237

3rd Edition

Authors: Michael C. Whitlock, Dolph Schluter

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