LIFESCI 1 Lecture 22: LS1- Chapter 51 Notes
Document Summary
Population ecology: study how and why the size, range and density of a population changes over time. Demography: the study of factors that determine the size and structure of populations through time. Generation: the average time between a mother"s rst offspring and her daughter"s. Fecundity: the number of female offspring produced by each female in a population. Key features of a population: size, range, density: abundance: the number of individuals, biomass: amount of living material. Population distribution: clumped, uniform, random: transect-quadrant method do determine population size and density, mark-recapture: m/n = m/n. Survivorship curves: the proportion of offspring that survive, on average, to a particular age. Life history: how an individual allocates resources to growth, reproduction, and activities/structures: high fecundity and low survivorship vs low fecundity and high survivorship, natural selection shapes life history to maximize tness in a given environment. Factors affecting population size: births, deaths, immigration, emigration. Exponential growth: growth rate (r) does not change over time.
