# NRES 470 Models

These models and simulations have been tagged “NRES 470”.

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.
4b. Change the Age 1 mortality rate to 0.3. Run the simulation starting with 75 individuals, all in Age class 1. What happens? Is this a stochastic model? If not, why does it look like it has a random component?
No. It shows no randomness whether initial Age 1 population is 75 or 1000. Setting the time stamp to 0.1 eliminates the appearance of randomness.
4b. Change the Age 1 mortality rate to 0.3. Run the simulation starting with 75 individuals, all in Age class 1. What happens? Is this a stochastic model? If not, why does it look like it has a random component?
No. It shows no randomness whether initial Age 1 population is 75 or 1000. Setting the time stamp to 0.1 eliminates the appearance of randomness.

What are the effects of connectivity of subpopulations on population viability?

demographic stochasticity

What are the effects of connectivity of subpopulations on population viability?

What are the effects of connectivity of subpopulations on population viability?

What are the effects of connectivity of subpopulations on population viability?

1e. Let’s think through the problem one more time- we are uncertain about the true value of the per-capita birth rate, 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))
Lab 3 part 3 NRES 470
Human Population growth