What a population has that one animal does not. Birth rate, death rate, sex ratio and age pyramids, and the two growth curves, the J shaped curve and the S shaped curve, with r and K. Python counts the changes year by year.
3 lessons, about 1 h 20 min3 simulations11 problems4 practice questionsPython in every lesson
Created by StemPy LabA population has features that one individual does not have. Its density tells how crowded it is, and its size changes through four processes: births, deaths, immigration and emigration. This lesson gives the equation for the change, shows how to find the birth rate and the death rate for each individual, and shows how density is measured.
A population has a sex ratio, and it has an age distribution that is drawn as an age pyramid. The shape of the pyramid shows whether the population is expanding, stable or declining. This lesson gives the three age groups, the three shapes, and the rule that the lesson uses to read them.
A population with plenty of food grows faster and faster, in a J shaped curve. A real population meets limits, and its curve becomes S shaped, with a carrying capacity K. This lesson gives both equations, the meaning of r and K, the phases of the S curve, and the life history strategies of different species.
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