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NRES 470

Lab 5, Exercise 3b (Minimum Viable Population)

Richard Murphy
3b. Is the current population viable, under the criteria listed above? That is, is there a less than 5% risk of extinction over a 50-year time frame? Hint: use the Sensitivity Testing tool to run 500 replicates. Visualize the 95% quantile. For a viable population the 95% quantile should stay above 0 (extinction) up to at least year 50 of the simulation.

NRES 470

  • 1 year 3 months ago

Lab 5, Exercise 1b through 1e

Richard Murphy

1e. Let’s think through the problem one more time- we are uncertain about the true value of the per-capita birth rate, b">bb, for a rare species. The actual birth rate for this population could be anything from 0.15 to 0.35 - we really can’t say! Given this uncertainty, we want to know what the abundance will be after 15 years. If you were tasked with evaluating this question, which of the two plots you generated in (1d) would be most appropriate for answering this question? Why?
Rand(0.15, 0.35)
Fix(Rand(0.15, 0.35))

NRES 470

  • 1 year 3 months ago

In-class exercise 2, 3-5-18.

Richard Murphy
Is the effect of demographic stochasticity bigger at low or high abundances? low populations are more susceptible. The smaller the population, the greater the risk of extinction resulting from fluctuations caused by demographic stochasticity.

NRES 470

  • 1 year 3 months ago

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