Lecture 2 - More Life Histories

Question 1

What is nx in terms of life history tables? [1]

Answer 1

nx refers to the number of individuals

Question 2

What is lx in terms of life history tables? [1]

Answer 2

lx = Age x/Age 0

Question 3

What is sx in terms of life history tables? [1]

Answer 3

Sx = Agex+1 / Agex

Question 4

What is mx in terms of life history tables? [1]

Answer 4

It’s the number of offspring per individual.

Question 5

What is IxMx in terms of life history tables? [1]

Answer 5

It’s the number of offspring/surviving females to age x

Question 6

What is R0 in terms of life history tables? [2]

Answer 6

The average number of offsprings produced per individual over her lifetime.

Population declines under 1.

Increases over 1.

Is stable at 1.

Question 7

What else can R0 be used for other than Population? [1]

Answer 7

R0 can be used to measure disease.

Question 8

What is the equation to calculate generation time via life history tables? [1]

Answer 8

G = Σ(xlxmx)/R0

Question 9

Generation time is the ______ time between ____ of individuals and _____ of their offspring [1].

Answer 9

Generation time is the average time between birth of individuals and birth of their offspring.

Question 10

Why would generation time not be calculated for a species past a certain age? [1]

Answer 10

If an organism passes reproductive age without reproduction, there will be no next generation.

Question 11

How does reproductive rate impact mortality? [1]

Answer 11

Mortality rates increase with increased reproduction.