| Concepts | Questions | Media Resources |
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.
Answer 2. How does primary succession differ from secondary succession?
Answer | Essential Study Partner
Introduction
Organization
SuccessionGeneral Biology Weblinks
Ecology |
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.
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3. How does environmental resistance influence the rate of growth of a population?
Answer4. What is a demographic transition?
Answer | Essential Study Partner
Introduction
Characteristics
Growth
Human Population
Control of Human PopulationsArt Quizzes
Two Models of Population Growth
Survivorship Curves
History of Human Population Size
Population Pyramids from 1990
Geometric and Arithmetic ProgressionsAnimation 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?
Answer6. What is coevolution?
Answer | Essential Study Partner
Size Regulation
Life HistoryArt Quizzes
Competition and Niches
Predator-Prey CycleCase Study
The Wolf in Yellowstone National Park |
