An article in Oikos: A Journal of Ecology [Regulation of Root Vole Population Dynamics

Chapter 14, Problem 14-16

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An article in Oikos: A Journal of Ecology [Regulation of Root Vole Population Dynamics by Food Supply and Predation: A Two-Factor Experiment (2005, Vol. 109, pp. 387395)] investigated how food supply interacts with predation in the regulation of root vole (Microtus oeconomus Pallas) population dynamics. A replicated two-factor field experiment manipulating both food supply and predation condition for root voles was conducted. Four treatments were applied: (no-predator, food-supplemented); (predator-access, food-supplemented); (no-predator, nonsupplemented); (predator-access, food-supplemented). The population density of root voles (voles for each treatment combination in each is shown below. Food Supply Predation (F) (P) Replicates 88.589 114.059 200.979 56.949 97.079 78.759 65.439 89.089 172.339 40.799 47.959 74.439 (a) What is an appropriate statistical model for this experiment? (b) Analyze the data and draw conclusions. (c) Analyze the residuals from this experiment. Are there any problems with model adequacy?