Lec 20- Modeling Competition

Question 1

competition coefficient

Answer 1

magnitude of negative effects of individuals of one species on individuals of a second species (unit-less and per capita metric)
12 (species 2 on species 1) (deer on pop growth rate of bison)
21 (species 1 on species 2) (bison on pop growth rate of deer)

Question 2

competition coefficient = 1

Answer 2

same effect as intraspecific competition

Question 3

competition coefficient > 1

Answer 3

greater effect than intraspecific competition

Question 4

competition coefficient < 1

Answer 4

smaller effect than intraspecific competition

Question 5

what does the competition coefficient describe?

Answer 5

per capita effects of one species on the other

Question 6

competition coefficient (species 2 on 1)

Answer 6

• multiply alpha coefficient with # of individuals in competitor species
• more individuals in competitor species, stronger the population growth will be slowed
• with interspecific competition

Question 7

alpha x N

Answer 7

population level effects

Question 8

alpha (12) x N2

Answer 8

effect of size of population 2 on population 1

Question 9

alpha (21) x N1

Answer 9

effect of size of population 1 on population 2

Question 10

isoclines of zero population growth (ZNGI)

Answer 10

population size of a species and its competitor where population growth of species in competition is 0

Question 11

can co-existence occur?

Answer 11

only when interspecific competition is weaker than intraspecific competition