Chapter 52 Notes (Population Ecology)

Chapter 52 Notes (Population Ecology) - Chapter 52 Notes...

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Chapter 52 Notes (Population Ecology) 1. The definition and characteristics of population a. Population is a group of individuals of a single species living in the same general area; therefore individuals interact in the population. 2. The factors that affect the population a. Density = the number of individuals per unit area or volume – how densely the organisms are organized. b. Dispersion = the pattern of spacing among individuals within the boundaries of the population. i. Clumped dispersion: one in which individuals aggregate in patches. May be influenced by resource availability and behavior Most common kind Example) Dispersion of humans in the U.S ii. Uniform dispersion: one in which individuals are evenly distributed Results from antagonistic interactions among individuals in the population May be influenced by social interactions such as territoriality Example) Red squirrels, which hide food and actively defend territories iii. Random dispersion: one in which the position of each individual is independent of other individuals c. Demography = the study of the statistics of a population and how they change over time. i. Death rates (mortality rate) and birth rates are of particular interest to demographers. ii. Life table: A table listing such items as age, observed number of organisms alive each year, and life expectancy. Is an age-specific summary of the survival pattern of a population Is best constructed by following the fate of a cohort. iii. Survivorship Curve: A graphic way of representing the data in a life table Type I: low death rates in early/midlife; sharp death rate in old age - Example) Humans in developed countries, mammals. Type II: constant death rate over life span; independent of age.
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This note was uploaded on 02/11/2012 for the course ZOOLOGY 152 taught by Professor Stephengammie during the Fall '11 term at Wisconsin.

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Chapter 52 Notes (Population Ecology) - Chapter 52 Notes...

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