Biology 2483A Study Guide - Cooperative Breeding, Computer Program, Ecological Niche
17 Jan 2013
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Document Summary
Distribution- geographic area where individuals of a species occur. Abundance- # of individuals in a given area (size or density) Area occupied is not known- area is bordered based on knowledge of species. Some can disperse (whales), some can"t (plants) Some species hard to determine what an individual is (aspen) Apomixis- unfertilized seed/egg can hatch (dandelions, lizards) Genet- single genetic individual (product of single fertilization) Ramet- each member of a genet that is independent physiologically. Distribution & abundance limited by: habitat suitability. Abiotic features- moisture, temp, ph, sunlight, nutrients. Some species can tolerate wide ranges, some narrow. Biotic features- herbivores, predators, competitors, parasites, pathogens. In aus. , intro cactus pest species spread like crazy, moth released to eat it. Abiotic & biotic interact to determine distribution & abundance. Eg. range of temp is big, but can"t live everywhere because of competitors. Disturbance- events that kill/damage some individuals (some species thrive after the fire e. g: historical factors.
