Question 1 Consider Figure 4 below (based on Figure 1A from the paper). Notice t

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Question 1 Consider Figure 4 below (based on Figure 1A from the paper). Notice that the y axis is a measure of productivity, and the x axis is number of species. Number of species is called species richness, but in this experimental design it is highly correlated with diversity. Species were all seeded in roughly equal proportions, so the main determinant of diversity is number of species. We use the term diversity here to be consistent with the use in the paper What is the general relationship of diversity and productivity from this large-scale, long-term study? What is the shape of the line indicating the relationship? Calculate (or estimate) average productivity of monocultures and average productivity of 8-species plots. What is the difference? Based on the pattern in the graphs, what would you predict productivity would be if Tilman had included a treatment of 32 plant species? 0.35 0.30 0.25 0.20 . 2000 * 1999 1998 . 1997 .1996 0.10 0.05 0 6 8 10 12 14 16 Species number Figure 4 The dependence of plant aboveground biomass on the number of planted species. Data are shown as the mean ± SE

Explanation / Answer

The relation between diversity and productivity is productivity increases with diversity.

In this x- asis is measure of productivity and Y- axis is ni=umber of species.

The average productivity of monocultures and average productivity of 8 species plot is 0.24 kg/m2

For 32 speices plot productivity would be approximately 0.3kg/m2

The productivity pattern for 32 speices plot will decrese from 16 species plot like 8 - 16 species plot

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