Lionfish Invasion: Density-Dependent Population
Visualizing a population growth model
Let’s take a closer look at the continuous-time logistic model.
We’ll now explore a new variable,
, which represents the realized per capita growth rate: the
growth rate of the population per individual. Unlike the
maximum per capita growth rate
, which is a constant,
will change as the population grows.
Click on the three points highlighted on the lionfish population
growth curve in the graph below.
For each point you click, you will get more information about the
population growth rates (both the overall growth rate
and the per capita growth rate
) at that time. The estimated numbers of lionfish at that time will
also appear, separated into two groups: adults and juveniles. The
adults, shown in white, are fish that were present at the
start of that year. The juveniles, shown in blue, are new
fish that were added to the population during that year.
Lionfish population estimates using a continuous-time logistic model