Population Demographics

Practice flashcards based on key concepts from the lecture on population demographics.

What does survivorship (lx) represent in life tables?

The proportion of individuals surviving from birth to age class x.

How is fecundity (mx) defined in demographic studies?

The average number of offspring an individual will produce during age class x.

What does R0 represent in demographic biology?

The net reproductive rate, which is the mean number of offspring produced per individual across their lifetime.

What is generation time (G) in population studies?

The average age of parents across all offspring produced.

What is the estimated global population in 2023?

8 billion.

What historical event caused a significant decline in population during the mid 14th century?

The Black Death pandemic.

What is the primary purpose of using a life table?

To calculate or estimate demographic quantities such as survivorship curves, life expectancies, and reproductive numbers.

What are the values of R0 that correspond to population growth or decline?

R0 > 1 indicates growth, R0 = 1 indicates stability, and 0 < R0 < 1 indicates decline.

What role do large juveniles play in population dynamics according to Crouse et al 1987?

They have a significant positive impact on the population growth rate (r) even though they may not have the highest fecundity.

What does the case fatality rate (CFR) refer to?

The ratio between confirmed deaths and confirmed cases of a disease.