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10 3 07 - Scope of Ecology Ecology is the study of...

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Scope of Ecology Ecology is the study of interactions of organism with other organisms and with the physical environment. The study of interactions can be undertaken at many levels: the individual organism, populations, communities, ecosystems, and the biosphere. A population is all the members of the same species interacting with the environment at a particular locale. A community consists of the various population in an area. An ecosystem is the community plus its nonliving habitat, including abiotic (nonliving) and biotic (living) components. The biosphere is the portion of the entire earth’s surface, including air, water, and land where living things exsist. Ecology describes the environment and tests models. Terrestrial Community What effects a population? A community? An ecosystem? A biosphere? Population Characteristics and Growth Population density is simply the number of individuals per unit area or volume. Distribution of these individuals can be uniform, random, or clumped Most members of population are clumped, as are the members of a human population. Patterns of distribution within a population Factors Affecting a Population Abiotic factors such as water, temperature, and availability of organic nutrients often determine a population’s distribution. Biotic Factors such as the availability of food, or presence of disease, affect the
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This note was uploaded on 04/10/2008 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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10 3 07 - Scope of Ecology Ecology is the study of...

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