Population Size Estimates Using Mark-RecaptureIntroduction:Ecology is the study of the interactions between organisms and their environment. These interactions can be studied on multiple levels, from the individual to the global ecosystem. One of these levels is on the scale of populations – a group of individuals of a single species living in the same general area. One of the most basic and important facts that can be gathered about a population is its size.Estimating the population size of sessile (immobile), large, and easily identifiable organisms may be simple – it is enough to count them. However, this is often not practical or even possible for other organisms. In that case, it is necessary to take a sampleof the population, and from that, a population size estimate can be extrapolated. One of the ways to go about this is the mark-recapturemethod.Mark-RecapturemnnN21=N = population size estimaten1 = total number captured and then marked in the first sampling
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