20. Modelling Competition

Question 1

Basic logistic model equation without interspecies competition

Answer 1

∂N/∂t = rmax N (K−N/K)

Question 2

basic logistic model equation with interspecies competition

Answer 2

∂N/∂t = rmax1 N1 ((K1−N1−α12 N2)/K1

Question 3

Competition coefficient

Answer 3

α
magnitude of negative effects of individuals of one species on individuals of a second species. describes per capita effects

e.g. α21=4 means one individual of species 1 has the same effect as 4 inidividuals of species 2 on the population growth of species 2

α12 = effect of species 2 on species 1

1= same as intraspecific
1> greater effect than intraspecific
1< smaller effect than intraspecific

Question 4

population level effects

Answer 4

α12 × N2 = effect of size of population 2 on population 1