Try running the model with the parameterization we discussed above. What is the carrying capacity of this population? So the linear formula for computing yearling survival as a function of adult female abundance should be: Open the equation editor for yearling survival, and input the equation above! For example, this one is density-independent:
So … if you input the following into the equation editor for yearling survival, you can easily go back and forth between the density-dependent and the density-independent formulations of the model:
Grizzly bear PVA example
You can assess extinction risk using the following formula: What do you notice about this model? For each additional individual in the adult population, yearling survival decreased by 0. To convert back to a fraction, we divide this linear model by ! Open the equation editor for yearling survival, and input the equation above! Therefore, our conceptual life history diagram looks something like this!