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Population Ecology Introduction (Chap. 9) A. Examples: The scope of population ecology B. Definitions and properties Terms: population, distribution, abundance, density, age structure, growth rate, demographics II. Growth rates: intrinsic rates of increase (Ch. 11) A. Geometric growth

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slide1

Population Ecology

    • Introduction (Chap. 9)
  • A. Examples: The scope of population ecology
  • B. Definitions and properties
  • Terms: population, distribution, abundance, density, age structure, growth rate, demographics
  • II. Growth rates: intrinsic rates of increase (Ch. 11)
  • A. Geometric growth
  • B. Exponential growth
  • C. Logistic growth
definitions
Definitions
  • Population: a group of individuals of the same species occupying a particular space at the same time.
slide3

Taylor and Southard. 1997. http://www.ocs.orst.edu/reports/climate_fish.html

cheatgrass bromus tectorum
Cheatgrass (Bromus tectorum)

A. Whitham. 2003.

http://environmentalstudies.wlu.edu/Capstone%202003/Images/Capstone%202003%20Agricultural%20Invaders.htm

this is our world

www.smalltownproject.org/

This is our world

http://www.nhm.ac.uk

U.S. 306,560,607World 6,783,691,06914:44 GMT (EST+5) Jun 01, 2009

global change s
Climatic change

Pollution

http://news.nationalgeographic.com/news/

http://www.oceansatlas.org/

http://library.thinkquest.org/

http://www.ourworldfoundation.org.uk/polar.jpg

Molles 2007

Global changes

Overharvest

Species invasions

Land use change

- type

- intensity

Loss of biodiversity

questions
Questions
  • Will exponential growth continue indefinitely?
  • How will population distribution change with time?
  • How many people can the Earth hold?
  • - What’s the carrying capacity for Earth?
  • - At what standard of living?

http://www.fpsoftlab.com/images/screenshots/earth-640x480-2.jpg

properties of a population
Properties of a population:
  • Distribution - over what area is the population found. This includes:
  • Abundance – how many total individuals
  • Density - how many individuals in the same area at the same time
population growth
Population Growth
  • Growth rate: how many individuals are gained (birth and immigration) minus how many are lost (death and emigration).
  • - what is happening to the net population size.
  • Age structure: how many individuals in different age categories, usually related to reproduction

http://www.nhm.ac.uk

Taylor and Southard. 1997. http://www.ocs.orst.edu/reports/climate_fish.html

other terms
Other terms
  • Demographics covers the basic statistical information about a population: age structure, density, births, deaths, growth, and reproduction.
chapter 9 focus on the following questions
Chapter 9. Focus on the following questions:
  • 1. What factors limit the distribution of a population of organisms?
  • 2. What is the difference between a fundamental and a realized niche?
  • 3. What do patterns of distribution (random vs. regular vs. clumped) tell us about the ecology of individuals in that population?
  • 4. How does organism size influence population density (number of individuals in a given area)?
  • 5. What are the seven different ways that organisms can be rare? How does this influence their susceptibility to extinction?