Unit 5 - Modelling Population Growth

Question 1

population growth rate

Answer 1

refers to the change in a population over a period of time

Question 2

(+) growth

Answer 2

rate indicates the pop is increasing

Question 3

(-) growth

Answer 3

rate indicates pop is decreasing

Question 4

0 growth

Answer 4

indicates no change in pop size

Question 5

zero population growth (ZPG)

Answer 5

a situation in which the death and the birth rate are in equilibrium

Question 6

per capita growth rate (r)

Answer 6

the difference between the per capita birth rate and the per capita death rate of a population

Question 7

Exponential Growth

Answer 7

a pattern of pop growth where organisms reproduce continuously at a constant rate

Question 8

ecologist able to determine…

Answer 8

the instantaneous growth rate of the pop expressed in terms of the intrinsic (per capita) growth rate (r)

Question 9

birth rate =

Answer 9

b

Question 10

death rate =

Answer 10

d

Question 11

r =

Answer 11

growth rate per capita

Question 12

N

Answer 12

pop size

Question 13

dN/dt =

Answer 13

instantaneous growth rate of pop

Question 14

exponential growth; calculating doubling times

Answer 14

the doubling time of a pop is the amt of time that is need for a pop to double in size (the greater the rate of pop growth, the faster the pop will double)

Question 15

constant

Answer 15

for any pop that is growing exponentially, the time that is needed for the pop to double in size is a constant

Question 16

doubling time equation

Answer 16

td= 0.69/ r

Question 17

Geometric Growth

Answer 17

(A) - pattern of pop growth where organisms reproduce at fixed intervals at a constant rate
A= fixed growth
N= pop in 1y
t= year

Question 18

calculation pop w growth rate

Answer 18

N(t) = N(0)A

Question 19

Modelling Logistic Growth

Answer 19

food, water, light, and space within an ecosystem are factors that limit pop growth as resources r consumed as the pop nears the ecosystem’s carrying capacityo

Question 20

individual outnumbers the resources…

Answer 20

the pop tend to drop off as individuals compete for the remaining resources

so the growth rate drops below r(max) in this case

Question 21

stable equilibrium

Answer 21

(birth = death) is often reached

Question 22

k=

Answer 22

pop number at carrying capacity

Question 23

Logistic Growth

Answer 23

is the most common growth pattern seen in nature as it represents the effect of carrying capacity on the pop growth logistic growth equation

Question 24

logistic growth equation

Answer 24

dN/dt=r(max)N[(K-N)/K]

Question 25

S-Shaped (sigmoidal) growth

Answer 25

sigmoid is an s-shaped curve, typical of pop growth that starts slow, accelerates or grows rapidly and then levels out over time

Question 26

three distinct phase

Answer 26

lag phase
log phase
stationary phase

Question 27

lag phase

Answer 27

occurs when pop is small and increasingly slowly

Question 28

log phase

Answer 28

occurs when pop undergoes rapid growth

Question 29

stationary phase

Answer 29

as available resources bc limited, pop experiences environmental resistance and stationary phase occurs in which the pop is at dynamic equilibrium (b=d)