BSCI 106 Lecture Notes - Lecture 2: Survivorship Curve, Life Table, Population Ecology

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Population ecology factors regulating population growth rates and population size: density, n, growth, death rates, limiting resources. Number (n: important for assessing potential for increase in absolute numbers, particular importance in conservation. Density (n/area or volume: many ecological factors influenced by density of a population, not the absolute number, e. g. Patterns of dispersion: clumped patchy aggregates, uniform ex. penguins and eggs, random unpredictable (ex. pollination) Changes in n over time population dynamics: ignore immigration/emigration numbers, bd model. B/ t total number births per unit time. D/ t total number deaths per unit time. Nt+1 = nt + b d. Uses a sample of individuals over time to estimate number of offspring that average individual produces or average individual"s chance of dying (b/n)/ t = b (d/n)/ t = d. D=dnt r=per capita growth rate of the population r=b-d. Sex ratio: proportion of individuals of each sex. Age structure: relative number of individuals at each age, influences potential for growth.

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