Population Ecology Presented By: Dean Thomas. What is population ecology?
Population Ecology Introduction (Chap. 9) A. Examples: The scope of population ecology
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Transcript of Population Ecology Introduction (Chap. 9) A. Examples: The scope of population ecology
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Population Ecology I. Introduction (Chap. 9)
A. Examples: The scope of population ecologyB. Definitions and properties
Terms: population, distribution, abundance, density, age structure, growth rate, demographics
II. Growth rates: intrinsic rates of increase (Ch. 11)A. Geometric growthB. Exponential growthC. Logistic growth
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Definitions
Population: a group of individuals of the same species occupying a particular space at the same time.
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Taylor and Southard. 1997. http://www.ocs.orst.edu/reports/climate_fish.html
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Cheatgrass (Bromus tectorum)
A. Whitham. 2003. http://environmentalstudies.wlu.edu/Capstone%202003/Images/Capstone%202003%20Agricultural%20Invaders.htm
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This is our world
www.smalltownproject.org/
http://www.nhm.ac.uk
U.S. 306,560,607World 6,783,691,06914:44 GMT (EST+5) Jun 01, 2009
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http://www.oceansatlas.org/
http://news.nationalgeographic.com/news/
Molles 2007
Global changes
Climatic change
Land use change - type - intensity
Species invasions
Loss of biodiversity
Pollution
Overharvest
http://www.ourworldfoundation.org.uk/polar.jpg
http://library.thinkquest.org/
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http://www.fpsoftlab.com/images/screenshots/earth-640x480-2.jpg
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?
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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
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Population GrowthGrowth 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
Taylor and Southard. 1997. http://www.ocs.orst.edu/reports/climate_fish.html
http://www.nhm.ac.uk
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Other terms
Demographics covers the basic statistical information about a population: age structure, density, births, deaths, growth, and reproduction.
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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?