lec 6- population dynamics

Question 1

what is replacement rate?

Answer 1

one offspring to replace parent, results in a relatively stable population

Question 2

what is an example of rapid population growth?

Answer 2

humans, rabbits

Question 3

what are examples of population decline?

Answer 3

endangered species

Question 4

what is a cohort life table?

Answer 4

a life table that follows one group from birth until the last one dies, their lifetime

Question 5

what do life tables do?

Answer 5

describe overall growth of a population

Question 6

what is a static life table?

Answer 6

estimate survival and reproduction rates in a specific year

Question 7

what is X, nx, lx, sx, and bx in a life table?

Answer 7

x = age
nx = number alive
lx = number of survivors
sx = survival rate
bx = fecundity, number of offspring

Question 8

what is net reproductive rate?

Answer 8

R0 = number of offspring produced by average individual over her lifetime
R0 = sigma factor multiplied by lx bx

Question 9

what causes changes in population growth rate?

Answer 9

age structure

Question 10

what is G?

Answer 10

generation time
G = (sigma factor multiplied by age multiplied by lx bx)/ R0

Question 11

what is ra?

Answer 11

exponential growth rate of population
ra = ln(R0)/ G

Question 12

what does r>0, r=0, and r<0 mean?

Answer 12

population growing, stable, declining