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Tut3 - approach we are using Describe how this better...

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Population ecology worksheet 1 Mar 2010 1. An ecologist surveys a population of beavers and makes the following estimates: the sex ratio is 1:1; 20% of newborn individuals survive to be counted at age 1; female beavers do not give birth in their first reproductive season, have an average of 2 offspring in their second season, and have an average of 4 offspring for each season thereafter; female beavers survive from age 1 to age 2 with probability 0.5, and all subsequent years with probability 0.8. a. Make an age-structured life table, and estimate R for this population. Assume that censusing is done just before reproduction. b. There is a better way to model this population than the age-structured
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Unformatted text preview: approach we are using. Describe how this better approach would work in this case. 2. This figure shows population densities for two closely related species of small plants introduced into a new, favorable environment. 5 10 15 20 5 10 15 Time (years) Population density (indiv/m sq) Species 1 Species 2 a. Describe what happened to these two populations (as shown by the figure). b. Which species do has a larger r max ? A larger K ? c ± 2010 by Jonathan Dushoff and the 3SS teaching team. May be reproduced and distributed, with this notice, for non-commercial purposes only....
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