Campbell biology ch 53
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Population Ecology PowerPoint PPT Presentation


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Campbell Biology CH 53. Population Ecology. 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:.

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Population Ecology

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Campbell Biology CH 53

Population Ecology


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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