lec 8- population dynamics end

Question 1

what are the special cases that occur at small populations?

Answer 1

r < 0 = decline in population
depensation = individual performance declines at low population size
-below minimum viable population size = more susceptible to random events (stochastic)

Question 2

why does depensation equal low inidvidual performance?

Answer 2

in small populations, hard to find mates

Question 3

what are the 3 types of stochastic decline?

Answer 3

demographic stochasticity = random variation in sex ratio at birth, number of deaths, number reproducing
environmental stochasticity = decline in population numbers due to natural disasters
genetic stochasticity = loss of genetic variation due to small numbers in reproducing population