This sounds a bit like a homework question, so I am not going to answer this question entirely. The definition of demoraphic stochasticity however is readily available so I will define it for you: it refers to the variability in population growth rates due to different rates of individual reproduction and survival within a species. Say you have a population of 100 and you have a fluctuation in population size of 50, then over a few years, the population size will range between 50 and 150 individuals. However if you have a population size of 1000 and a similar rate of demographic stochasticity (e.g. 50) then the population will range between 950 and 1050 individuals. Which population is more likely to go extinct from these natural fluctuations in population size?

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## Answers

This sounds a bit like a homework question, so I am not going to answer this question entirely. The definition of demoraphic stochasticity however is readily available so I will define it for you: it refers to the variability in population growth rates due to different rates of individual reproduction and survival within a species. Say you have a population of 100 and you have a fluctuation in population size of 50, then over a few years, the population size will range between 50 and 150 individuals. However if you have a population size of 1000 and a similar rate of demographic stochasticity (e.g. 50) then the population will range between 950 and 1050 individuals. Which population is more likely to go extinct from these natural fluctuations in population size?

You can read more about demographic stochasticity here (http://darwin.eeb.uconn.edu/eeb310/lecture-notes/small-populations/node6.html).

Excellent answer Lunafish and thank you. I had no idea what this was but I totally understand it now. Great job!