Methods to separate process variation from sampling variation will be presented.ĭetection of a trend in a population's size requires at least two abundance estimates. The latter two sources often are referred to as process variation, i.e., variation in the population dynamics process associated with environmental variation (such as rainfall, temperature, community succession, fires, or elevation). Three sources of variation must be considered: sampling variation, temporal variation in the population dynamics process, and spatial variation in the dynamics of the population across space. In this section, we discuss sources of variation that must be considered to make inferences from data when trying to detect trends. ![]() Charles Gowan, in Monitoring Vertebrate Populations, 1998 5.2 VARIANCE COMPONENTS
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