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Chapter 4 Terms

APES Chapter 4 Terms

A population divided into groups by age. Sometimes the groups represent the actual number of each age in the population; sometimes the groups represent the percentage or proportion of the population of each age. age structure
The rate at which births occur in a population, measured either as the number of individuals born per unit of time or as the percentage of births per unit of time compared with the total population. birth rate
The rate at which deaths occur in a population, measured either as the number of individuals dying per unit time or as the percentage of a population dying per unit time. death rate
The pattern of change in birth and death rates as a country is transformed from undeveloped to developed. Three stages occur. demographic transition
In an undeveloped country, birth and death rates are high and the growth rate is low. First stage of demographic transition
The death rate decreases, but the birth rate remains high and the growth rate is high. Second stage of demographic transition
The birth rate drops toward the death rate and the growth rate therefore also decreases. Third stage of demographic transition
The net increase in some factor per unit time. In ecology, the growth rate of a population, sometimes measured as the increase in numbers of individuals or biomass per unit of time and sometimes as a percentage increase in numbers or biomass per unit time Growth rate
Theoretical estimates of the number of humans who could inhabit Earth at the same time. Human carrying capacity
The estimated average number of years (or other time period used as a measure) that an individual of a specific age can expect to live. Life expectancy
In terms of the logistic curve, the population size at which births equal deaths and there is no net change in the population. Logistic carrying capacity
The S-shaped growth curve that is generated by the logistic growth equation. In the logistic, a small population grows rapidly, but the growth rate slows down, and the population eventually reaches a constant size. Logistic growth curve
Genetically determined maximum possible age to which an individual of a species can live. Maximum lifetime
A group of individuals of the same species living in the same area or interbreeding and sharing genetic information. Population
The causes of changes in population size. Population dynamics
A group of individuals capable of interbreeding Species
The result when the number of births equals the number of deaths so that there is no net change in the size of the population. Zero population growth
Created by: MrsLigon