Population Demographics and Dynamics Vocabulary

Vocabulary flashcards covering demographic measurement terms, Malthusian concepts, carrying capacity definitions, and population structures from the lecture notes.

Demographic Equation

A mathematical formula $R = (b - d) + (i - e)$ representing population growth rate $R$, birth rate $b$, death rate $d$, immigration rate $i$, and emigration rate $e$.

Crude Birth Rate (CBR)

The annual number of live births per $1000$ people in a given population.

Crude Death Rate (CDR)

The annual number of deaths per $1000$ people in a given population.

Total Fertility Rate (TFR)

The average number of children a woman would likely have during her childbearing years.

Replacement Fertility Rate

The total fertility rate required for a population to remain stable without migration, typically $2.1$ children per woman to replace parents and counteract infant mortality.

Infant Mortality Rate (IMR)

The number of deaths of children under $1$ year of age per $1000$ live births.

Rate of Natural Increase (RNI)

The difference between the Crude Birth Rate and Crude Death Rate ($\text{CBR} - \text{CDR}$), expressed as a percentage or rate excluding migration.

Doubling Time

The number of years needed for a population to double in size assuming a constant growth rate, calculated as $70 \div r$ where $r$ is the annual growth rate in percent.

Rule of 70

A practical approximation formula derived from compound interest growth $V_t = V_0(1 + r)^t$ used to estimate doubling time by dividing $70$ by the percentage annual growth rate.

Carrying Capacity

The maximum population of a biological species that a particular environment can carry and sustain sustainably, given its physical and geographic features.

Exponential Growth

Unregulated population growth where numbers increase geometrically over time ($1, 2, 4, 8, 16 \dots$).

Logistic Growth

Regulated population growth that follows an S-shaped curve as the growth rate decreases upon approaching carrying capacity.

Malthusian Catastrophe

The critical point where exponential population growth overtakes linear subsistence growth, forcing a sharp corrective decline in population.

Preventive Checks

Voluntary actions that lower the birth rate to keep population near subsistence levels, including delayed marriage and moral restraint.

Positive Checks

Involuntary events that raise the death rate when preventive checks fail, such as famine, disease, and war.

Malthusian Trap

A recurring state where living standards are pulled back toward basic subsistence levels due to population growth consuming temporary gains.

Ecological Deficit

A state occurring when the ecological footprint of a human population exceeds the productive capacity of its local habitat, necessitating imports or lowered consumption.

Overshoot

A condition in which a population exceeds available carrying capacity, risking permanent impairment to local resource potential and subsequent population crash.

Biophysical Carrying Capacity

The natural ecological limit of resource generation and waste absorption, which can be raised through physical agricultural and industrial technologies.

Social Carrying Capacity

The efficient utilization and equitable distribution of existing biophysical resources achieved through human cooperation, coordination, trade, and organization.

Population Pyramid

A graphic illustration that depicts the distribution of various age groups and gender ratios within a specific population.

Population Momentum

The tendency for population growth to continue despite declining fertility rates due to a large percentage of individuals entering reproductive age.

Dependent Groups

Demographic segments of a population—specifically young children ($0$ to $14$ years old) and the elderly ($60+$ years old)—that rely on the working-age population for support.

The Population Bomb

A 1968 publication by Dr. Paul R. Ehrlich warning of global overpopulation, food shortage, and impending starvation.