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33.1 Scope of Ecology
Ecology is the study of the interactions of organisms with each other and the physical environment.

The study of ecology encompasses the individual, the population, the community, the ecosystem, and the biosphere.

Abiotic and biotic factors influence community composition and diversity.

Ecological succession is a change in species composition and community structure and organization over time.
1. Describe the individualistic model of community composition.

2. How does primary succession differ from secondary succession?
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General Biology Weblinks
33.2 Population Characteristics and Growth
Population size depends upon births, deaths, immigration, and emigration.

Two patterns of population growth (exponential and logistic) have been developed.

Mortality within a population is often illustrated by a survivorship curve.

The human population is still growing exponentially, and how long this can continue is not known.
3. How does environmental resistance influence the rate of growth of a population?

4. What is a demographic transition?
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Human Population
Control of Human Populations

Art Quizzes
Two Models of Population Growth
Survivorship Curves
History of Human Population Size
Population Pyramids from 1990
Geometric and Arithmetic Progressions

Animation Quizzes
Exponential Population Growth
Stages of Population Growths
33.3 Regulation of Population Growth
Life history patterns range from one in which many young receive little care to one in which few young receive much care.

Factors that affect population size are classified as density-independent and density-dependent.

Competition often leads to resource partitioning, which reduces competition between species.

Predation often reduces prey population density, which in turn can lead to a reduction in predator population density.

Symbiotic relationships include parasitism, commensalism, and mutualism.
5. Does competition tend to lead toward competitive exclusion or resource partitioning?

6. What is coevolution?
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Size Regulation
Life History

Art Quizzes
Competition and Niches
Predator-Prey Cycle

Case Study
The Wolf in Yellowstone National Park

Inquiry into LifeOnline Learning Center with Powerweb

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