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CHAPTER 4. Population Ecology. 4-1: Population Dynamics. Populations are described as follows: Density Spatial distribution Growth rate Would an individual be considered a population?. Population Characteristics. Population density – number of organisms per unit of area

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chapter 4

CHAPTER 4

Population Ecology

4 1 population dynamics
4-1: Population Dynamics
  • Populations are described as follows:
    • Density
    • Spatial distribution
    • Growth rate

Would an individual be considered a population?

population characteristics
Population Characteristics
  • Population density – number of organisms per unit of area
  • Spatial distribution
    • Dispersion (availability of resources is the most important factor)
      • Uniform
      • Clumped groups
      • Random

Which of these dispersion types would be the easiest to predict?

slide4

Population ranges

    • Only certain areas an organism can be located (i.e. Iiwi vs. Peregrine Falcon)
    • A species might not be able to expand its population range because it cannot survive the abiotic conditions found in the expanded region.
    • Is it possible for a population to grow unchecked in size?
population limiting factors
Population – Limiting Factors
  • Density-independent factors
    • Population size does NOT matter
    • Usually abiotic
    • Ex. Weather
  • Density-dependent
    • Population size does matter
    • Usually biotic
    • Disease, parasites & competition
slide6

Disease – outbreaks can be transmitted faster between individuals

  • Competition – when food and space become limited – fights will break out
  • Parasites – similar to disease
population growth rate
Population Growth Rate
  • Natality vs. Mortality (most important)
  • Emigration vs. Immigration
  • Exponential growth model (geometric growth)
    • No limits
    • Lag phase (slow at beginning)
    • J shaped curve
slide9

Logistic Growth Model

    • S shaped curve
    • Includes carrying capacity (population that can be supported by resources
reproductive patterns
Reproductive Patterns
  • R-strategists
    • Small
    • Short life spans
    • Many offspring
    • Little to no energy spent on offspring
    • An adaptation to unstable environments
reproductive patterns1
Reproductive Patterns
  • K-strategists
    • Large
    • Long life spans
    • Not many offspring
    • Lots of energy spent on offspring
    • An adaptation to stable environments

--Carrying capacity demonstration

4 1 homework
4-1 HOMEWORK
  • Pretend you are living in the 16 and 17 hundreds. Create an advertisement (possible group of two) urging American settlers to move westward using knowledge gained from the section. Be creative!!
  • Using the 3 dispersion patterns – find organisms that are defined by each and explain why.
  • Create a comic strip from the perspective of any r-strategist
  • Give me a real world example of a density-independent factor and a density-dependent factor. Research this – none from discussion or book allowed.
human population growth

http://www.pbs.org/wgbh/nova/worldbalance/

Human Population Growth
  • Demography – size, density, distribution, movement, birth & death rates
  • World population expected to double in about 53 years
slide17

Technological advances

    • We have learned to alter our environment to change carrying capacity
  • Human population growth rate
    • Although raising in overall population, the percent of increase is dropping
      • Diseases such as AIDS
      • Voluntary population control
trends in human population growth
Trends in Human Population Growth
  • Demographic transition (U.S. good example)
  • Zero population growth
    • Births + immigration = deaths + emigration
  • Age structure
    • Pre-reproductive (0-20)
    • Reproductive (20-45)
    • Post-reproductive (45 – 80+)
  • Human Carrying Capacity

http://www.footprintnetwork.org/en/index.php/GFN/page/calculators/

slide19

Trends in Human Population Growth

  • Demographic transition (U.S. good example)
4 2 homework
4-2 Homework
  • Comprehension sentences for the chapter – due on day of test
  • Personal feeling about human population growth worldwide using at least 5 terms from the chapter
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