Speak about age structure of population along with birth rate, mortality and population density. Age structure - one of the main characteristics of population.
The reasons to investigate age strukturusovremenny ecology, considering life of any population, considers age structure of the individuals making it. It also is clear: too young individuals can an adult state and not live whereas old individuals are not capable already to reproduction. For accounting of population fertility take the number only of mature individuals in consideration. How organisms in population will be distributed on age, depends on intensity of mortality and size of birth rate. The schedule age strukturygrafik age structure is changeable, even within the same population. In it significant changes can be observed. However at such changes the mechanisms similar to elastic forces in physics turn on: they seek to return a system to the initial state peculiar to this concrete population. The analysis of an age strukturyesla to analyze age structure, it is possible to make the forecast of number of population for several generations forward. Such forecast is made, for example, when want to estimate potential opportunities of trade of fish. Forecasting of number and in hunting economy, and in zoological researches is applied. Features of age population of a strukturysvoystvo as stable system are defined, in many respects, by features of age structure. The more variously are presented to age populations, the above it is protected from negative impact of random factors. Adverse environmental conditions can destroy some part of posterity of a single year. Factors of the external environment can destroy even all issue of any year. But for population with complex structure it will not be accident since the same couples of parents can give posterity repeatedly.