As part of a study of the effects of timber management

Chapter 0, Problem 5.63

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As part of a study of the effects of timber management strategies (Ecological Applications [2003]: 11101123) investigators used satellite imagery to study abundanceof the lichen Lobaria oregano at different elevations.Abundance of a species was classified as commonif there were more than 10 individuals in a plot of land. Inthe table below, approximate proportions of plots in whichLobaria oregano were common are given.Proportions of Plots Where Lobaria oreganoAre CommonElevation (m) 400 600 800 1000 1200 1400 1600Prop. of plotswith Lichen(10/plot) 0.99 0.96 0.75 0.29 0.077 0.035 0.01a. As elevation increases, does Lobaria oregano becomemore common or less common? What aspect(s) of thetable support your answer?b. Using the techniques introduced in this section, calculatefor each of the elevations and fitthe line (Elevation). What is the equation ofthe best-fit line?c. Using the best-fit line from Part (b), estimate the proportionof plots of land on which Lobaria oregano areclassified as common at an elevation of 900 m.