Lect 3 Community Ecology

Lect 3 Community Ecology - Community Ecology The study of...

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Community Ecology The study of the interactions among species living in a particular geographic area. Types of ecological interactions. Resources and resource utilization. Niches. Competition. Predation. Keystone species and community structure.
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Ecological Interactions Effects of interactions on the participants define the nature of the interaction.
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Niche Definition: the set of physical and biological parameters that define the living requirements and living conditions of a species. A niche is a multidimensional volume in resource space that describes the set of environmental and biological conditions under which the species can survive. The niche of a species may change in response to competition and environmental change. Over time, selection may alter the niche of an organism.
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Ecological Niche Often defined as an organism’s “way of life” or “role” in a community ( after Charles Elton, 1927 ) Alternatively, the sum of all sites in a community where a given species can live ( after Joseph Grinnell, 1917 ) More broadly defined as the intersection of the ranges of environmental parameters within which a given species can persist ( after G. E. Hutchinson, 1957 ) realized niche : in the presence of species that have a negative impact on the organism (competitors, predators, pathogens) fundamental niche : in the absence of such other species niches of different species generally have minimal overlap
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Competition Competition is usually most intense among organisms with similar niches, i.e., conspecifics (intraspecific competition). Indirect competition.
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This note was uploaded on 07/21/2010 for the course PHYS 2212 taught by Professor Lasater during the Spring '10 term at Albany State University.

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Lect 3 Community Ecology - Community Ecology The study of...

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