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Population Ecology

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Campbell Biology CH 53

Population Ecology

- Age Structure
- Environmental Factors
- Population Density & Distribution
- Population Size & Growth
- Survivorship

- Interact
- Interbreed
- Share Resources
- Same Environment
- Same Species
- Uniform Distribution

- Total # of Individuals
- # of Individuals per Area
- # of Individuals per Volume
- Both 2 & 3

- Mark-Recapture
- Dispersal
- Direct Count
- Both 1 & 2
- Both 1 & 3
- Cannot ever be fully determined

- Population Density = how many individuals are living in a specific area or volume.
- Use density to determine count and vice versa … think back to our yeast lab.
- General Distribution

U2-5 Describe interactions and factors that affect population size and growth.

- Topic: Population Ecology & Survivorship.
- Questions:
- What is the effect of age on survival in human populations?
- What is the effect of gender on survival in human populations?

- Hypothesize It!
- Analyze It! Make 3 Graphs
- Conclude It!

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

- Short Gestation
- Long Gestation
- Unlimited Resources
- Limited Resources

- Immigration
- Emigration
- Deaths
- Births
- Both 1 & 3
- Both 2 & 3
- Both 2 & 4

- Growth=(New Individuals)–(Loss of Individuals)
- Equations:
- Where:
- r is the per capita growth rate
- N is the population size
- ΔN is the change in population
- Δt is the time interval

- Where:

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

- In 2009, the USA had a population 307 million. If there were 14 births and 8 deaths per 1,000 people, what is the growth rate of US citizens in 2009 (not including Immigration or Emigration)?

U2-5 Describe interactions and factors that affect population size and growth.

- Populations are limited by resources
- Birth & Death Rates Oscillate
- Density is independent

- Carrying Capacity (K) = the total number of individuals an ecosystem can support.
- Equation:

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

- True
- False

U2-5 Describe interactions and factors that affect population size and growth.

Density-independent

Density Dependent

Competition

Predation

Toxic Waste

Intrinsic Factors

Territoriality

Disease

- Climate/Weather
- Natural Disasters
- Etc.

U2-5 Describe interactions and factors that affect population size and growth.

R-Selected Species

K-selected Species

Density-Dependent Selection of Traits

Examples:

Low # of offspring with large investment/energy of care.

- Density-Independent Selection of Traits
- Examples:
- High # of offspring with little investment/energy towards care.

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

- http://www.youtube.com/watch?v=4BbkQiQyaYc

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.

U2-5 Describe interactions and factors that affect population size and growth.