BIOLOGY 1M03 Chapter 52: Biology Chapter 52.docx
8 Sep 2014
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Document Summary
A population is a group of individuals of the same species that live in the same area at the same time. In both ecology and evolutionary biology, populations are the basic units of analysis. Population ecology is the study of how and why number of individuals in a population changes over time. Number of individuals present in a population depend on four processes: birth, death, immigration and emigration. Populations grow due to births and immigration, which occurs when individuals enter a population by moving from another population. Populations decline due to deaths and emigration, which occurs when individuals leave a population to join another population. Demography is the study of factors that determine size and structure of populations through time. To made detailed predictions about future of a population, biologists must understand the makeup of the population in more detail.
