Population Ecology I.Introduction (Chap. 9) A. Examples: The scope of population ecology B. Definitions and properties Terms: population, distribution,

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Presentation transcript:

Population Ecology I.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 Population: a group of individuals of the same species occupying a particular space at the same time.

Taylor and Southard

Cheatgrass (Bromus tectorum) A. Whitham

This is our world U.S. 306,560,607 World 6,783,691,069 14:44 GMT (EST+5) Jun 01, 2009

Molles 2007 Global changes Climatic change Land use change - type - intensity Species invasions Loss of biodiversity Pollution Overharvest

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?

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 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 Taylor and Southard

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: 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?