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Resh3 - Biology 1B Ecology Lecture 3 Page 1*Assigned...

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Biology 1B, Ecology Lecture 3, Page 1 Professor Resh Spring 2009 *Assigned readings, 8 th Edition pp. 1174-1181 7 th Edition pp. 1136-1139 Dynamics of Populations Outline of Lecture 3 A. Density B. Dispersion 1. Random 2. Uniform 3. Clumped, contagious, and aggregated C. Sampling effort to estimate population size D. Density, dispersion, and statistical precision * Three principles used in sampling effort E. Demography A. Density: the number of individuals per unit area or volume; densities are determined using direct counts, quadrats, or indirect methods (e.g. mark-recapture) N = Number marked initially X total catch on second trapping Number recaptured in second trapping B. Dispersion (degree of aggregation; spatial distribution, etc.): the pattern of spacing of individuals within the boundaries of a popula- tion (see Fig. 52.3 on p. 1138, 7 th Edit. or Fig. 52.2 on p. 1153, 6 th Edit.) . Random Regular or Uniform Contagious or Clumped
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Biology 1B, Ecology Lecture 3, Page 2 Professor Resh Spring 2009 *Assigned readings, 8 th Edition pp. 1174-1181 7 th Edition pp. 1136-1139
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