Biology 2483A Lecture : Population Extinction

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If it gets too low not a lot of potential to last much longer. Computer simulation start off with a certain population; change the lambda value randomly it is possible to get 2/3 bad years in a row or vice versa. This simulation allows us to see when a population could go extinct. All bounce up and down green and red could bounce back form the low periods, while the black couldn t bounce back once you hit 0 its gone. Two of the simulated populations recovered from low numbers and survived. The third population went extinct in the 54th year of the simulation. As we increase the standard deviation they get more and more spread out. More we allow the environmental conditions to vary the more we endanger the populations. When variable environmental conditions increase the extent to which a population s growth rate fluctuates over time, the risk of extinction also increases.

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