Lab 9: Population Growth

What is a population?

Group of interbreeding members of the same species within a defined area

Biotic Potential

Maximum reproductive capacity theoretical population growth

Unique properties not found in individuals:

Density

Dispersion

Birth rate

Death rate

Biotic Potential

Age distribution

Limiting Factors

Density dependent

Density independent

Density dependent effects increase with population

Disease

Space

Food

Density independent

Climatic Factors

Kill of individual predator

what is blue?

Theoretical

what is red?

Realized

what is 1?

Lag phase

what is 2?

Exponential growth phase

what is 3?

Inflection point

what is 4?

Decreasing growth phase

what is 5

Carrying capacity

Lag phase

due to small number of organisms

Exponential growth phase

periodic doubling of populations

Inflection point

start of decreasing growth phase

Decreasing growth phase

curve makes a right turn

Carrying capacity

population size in balance with the environment

Theoretical or Exponential growth

dN/dT= r_max N

Realized or Logistic growth

𝑑N/𝑑T = r_max (K−N)/ K) N

Human Growth Rate

1. Birth Rate-Death Rate/1000 people

2. Convert to %

Doubling time

Time required for a population to double in size

how to figure out doubling time?

1. Birth Rate-Death Rate/1000 people

2. Convert to %

3. divide % over 70 years