Population biology

The density depends on a trophic level on which there is a population.Reproductive opportunities of population depend on its life expectancy.Life expectancy of individuals of a population can be estimated, using curve survivals.In such populations the mortality rate coefficient exceeds factor of birth rate.The important factor in the change of the population numbers is the parity of sexes.It is also important to calculate the energy and resources spent on reproduction in the population.Abiotic factors render essential influence on density of populations of animals and plants.Express quantitative characteristics of a population as the whole.Concept Of The Population.Features Of Populations.