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## PowerPoint Slideshow about ' Population Ecology' - dionne

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Which do you think is the most important in population ecology?

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

All of the following are required to be in a population EXCEPT:

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

Population density is the

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

Population density can be determined by

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

Population = same species, resources, environment that interact/interbreed

- 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.

BIO HAC: Tapping Into Knowledge

- 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.

Survivorship = How long will you survive?

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

Exponential population growth assumes

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

Which of the following limit exponential growth?

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

Exponential Population Growth

- 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

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

Exponential Population Growth

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

Population Growth Example Problem

- 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.

Logistical growth is more representative of populations because

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

Logistical Population Growth

- 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.

Exponential vs. Logistical Growth

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

Once a population reaches carrying capacity it cannot grow anymore.

- True
- False

Logistical Growth of Organisms

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

Factors Affecting Population 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.

Survivorship & Life-History

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.

K-Selection in American Kestrels

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

Population Dynamics: Many Factors Affect Population Success

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

Predator-Prey Cycles

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

Human Population Growth

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

Human Population Growth

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

Age Structure Diagrams

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

Comparisons of Industrialization

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

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

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