How can an age structure diagram indicate a growing or decli

How can an age structure diagram indicate a growing or declining population? Find and summarize an example of an ecological study (of humans or any other organism) that involves age-structure analysis. What are some considerations and exceptions to a standard interpretation of an age structure diagram? 100 words or more please

Solution

The term population is defined as a cluster of interbreeding species living together at a single place. The four variables that govern the change in population size are birth, death, immigration and emigration. Therefore,

Population change = (Birth + immigration) – (Deaths + emigration)

The two factors that limit the population growth of humans are that limitation of food resources and change in climate. Currently, humans facing food scarcity, it results the occurrence of different types of diseases in humans. Therefore, the death rate of juvenile’s increases and also population density will become low.

The term population age structure is defined as a structure that shows a population according to the age groups. The three major groups of an age structure are as pre-reproductive age group, reproductive age group and post- reproductive age group. Among these pre and post Reproductive age groups do not have the ability to increase population; whereas the reproductive age group can increase the density of population.

The three types of age structures are expanding (type-1), stationary (type-II) and contracting (type-III). For example, the democratic republic cango has rapid growth (type-I), the United States has slow growth (type-II) and Germany has negative growth (type-III).