NRES 470 Models

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

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
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?

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


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

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


Exercise 2, Problem 2b, Projection Matrix
Exercise 2, Problem 2b, Projection Matrix
 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 abu

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))
 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?

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?


      Is the effect of  environmental stochasticity  bigger at low or high abundances?

Is the effect of environmental stochasticity bigger at low or high abundances?
 What are the effects of connectivity of subpopulations on population viability?

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