Give reasons for 5 stars! Ecologists tested the effects that neighboring alpine

Question

Give reasons for 5 stars!

Ecologists tested the effects that neighboring alpine (mountain) plants had had on multiple target plant species at different elevations. They wanted to know whether positive interactions among species were likely to be more important under stressful conditions, as predicted by theory. In replicate plots for each target species, neighbors were either left in place or removed from the vicinity of the target plants; higher elevations were assumed to more stressful to plants (e.g., winter temperatures were colder and the winds stronger). The figure below shows the proportion of surviving target species in controls and neighbour removal treatments at low and high elevations (treatment: F1, 206 = 8.47, p = 0.004; elevation: F1, 206 = 2.10, p = 0.149; interaction: F1, 206 = 22.13, p < 0.001). Answer the following questions:

1. What is/are the independent variable(s)?

A) neighbors present/removed

B) elevation

C) both A and B

D) survival

2. What is/are the dependent variable(s)?

A) neighbors present/removed

B) elevation

C) both A and B

D) survival

3. What was the mean effect of neighbor removal on alpine plant survival?

A) positive

B) negative

C) depends on the elevation

D) no statistically significant effect

Explanation / Answer

C) both A and B.

D) survival.

B) negative.

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