Lecture 7 Population Growth part 1

Question 1

Sampling

Answer 1

Transect and quadrat method

Question 2

Density

Answer 2

number of individuals/ areas of quadrat

Question 3

Mark-recapture method

Answer 3

Step 1. Capture, mark, and release M individuals.
Step 2. Recapture another set of n individual later
Step 3. Count how many n was marked from before, m
N = estimated population size. N/M = n/m

Question 4

N

Answer 4

population density or size

Question 5

dN/dt

Answer 5

rate of change of population size

Question 6

Closed population

Answer 6

immigration and emigration negligible; changes dominated by births and deaths.

Question 7

Open population

Answer 7

immigration and emigration substantial

Question 8

Exponential growth solution

Answer 8

N(t)=Noe^rt
t = Number of individuals at time t

Question 9

What controls population keeps them at finite sizes?

Answer 9

Density dependent factors

Question 10

per-capita fecundity often

Answer 10

decreases with density.

Question 11

per-capita mortality often

Answer 11

increases with density.

Question 12

Logistic population growth

Answer 12

Assume per-capita growth rate decreases linearly with density i.e. replace r with r(1-N/K) where r: intrinsic rate of growth (y-axis) and K is the carrying capacity. The higher the N value it will ultimately lead to negative growth rate.