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For example, they might count the number of individuals in a series of randomly located plots, calculate the average density in the samples, and extrapolate to estimate the population size in the entire area.Instead, ecologists use a variety of sampling techniques to estimate densities and total population sizes.It is almost always impractical to count all individuals in a population.We can count individuals, but we usually estimate population numbers.Measuring density of populations is a difficult task.The dispersion of a population is the pattern of spacing among individuals within the geographic boundaries.The density of a population is measured as the number of individuals per unit area or volume.Every population has a specific size and specific geographical boundaries.Two important characteristics of any population are density and the spacing of individuals. Populations can evolve through natural selection acting on heritable variations among individuals and changing the frequencies of various traits over time.Members of a population rely on the same resources, are influenced by similar environmental factors, and have a high likelihood of interacting with and breeding with one another.A population is a group of individuals of a single species that live in the same general area.Population ecology is the study of populations in relation to the environment, including environmental influences on population density and distribution, age structure, and population size.Ĭoncept 52.1 Dynamic biological processes influence population density, dispersion, and demography.
To understand human population growth, we must consider the general principles of population ecology.Overview: Earth’s Fluctuating Populations
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