Competition 2

Question 1

what are the steps of lotka and volterra?

Answer 1

1. begin with logistic model for pop growth
2. assign subscripts to model parameters for each species –> 2 species
3. apply the brake on exponential pop growth with intraspecific competition at k/2

Question 2

what is the additional break and what does it signify
what is it called

Answer 2

alpha, it signifies interspecific competition
the competitive coefficent

Question 3

what does it mean when alpha of a species is equal to 0?

Answer 3

same effect as intraspecific competition

Question 4

what does it mean when alpha > 1

Answer 4

it means is has a greater effect than intraspecific competition

Question 5

what does it mean when alpha < 1

Answer 5

it mean it has smaller effect that intraspecific competition

Question 6

competetive coefficeint definition

Answer 6

magnitude of negative effects of individuals of one species on individuals of a second species (unitless, per capita metric)

Question 7

the competetive coefficient,
the 2 sides

Answer 7

alpha 12 indicates the effect of one individual of species 2 has on the growth rate of species 1
alpha 21 indicates effect of one individual of species 1 has on the growth rate of species 2

Question 8

N2 is always on the ZNGI

Answer 8

y axis

Question 9

N1 always on the ZNGI

Answer 9

X-axis

Question 10

changes in species 1 pop size (N1) indicated by: ZNGI

Answer 10

left-right arrow movements

Question 11

where is N1 y-intercept? ZNGI

Answer 11

K1/alpha 12

Question 12

Where is N1 x intercept ZNGI

Answer 12

K1

Question 13

when is pop growing for N1?

Answer 13

on left side of line

Question 14

when is pop decreasing for N1

Answer 14

right side of line

Question 15

when is pop decreasing for N2

Answer 15

pop for N2 will increase

Question 16

when is pop growing for N2?

Answer 16

below isocline

Question 17

pop increase and decrease for N2 indicated by?

Answer 17

horizontal or vertical arrows

Question 18

where is the y-intercept for N2?

Answer 18

K2

Question 19

where is x-intercept for N2?

Answer 19

K2/alpha21

Question 20

in order to tell if the 2 species coexist we need to?

Answer 20

combine the space state graphs of the 2 species

Question 21

who wins the space state graph?,

Answer 21

whoever is on top wins, because they will eventually reach their carry capacity, and the other species will continue to decline

Question 22

who wins if the pop sizes are in the state between the isoclines??

Answer 22

the dudee on the top wins, because their carrying capacity will be reached while other’s pop declines, leading to competitive exclusion

Question 23

how does coexistance occur in the space state (ZNGI)

Answer 23

if lines cross

Question 24

how to know if coexitance is stable or unstable?

Answer 24

carrying capacities(K1,K2) have to be smaller than k/alpha ratios

Question 25

what is it called when one species outcompetes a mf

Answer 25

competitive exclusion