Biology 3440A/B Lecture 8: Capture-Recapture
4 Mar 2020
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Be able to: identify when you would use the jolly-seber method to estimate population size. In survey period 3, of the 127 recaptured: 55 were from 1st capture, 72 were form the 2nd capture: describe how, in practice, you would design a mark-recapture study. Consider how you would capture and mark your animals. Additional calculations allow an estimate local survival or of dilution" (dilution of the proportion of marked individuals, caused by births and immigration). One study used jolly-seber to examine whether band colour affected survivorship of yellow egged gulls. Typically a researcher visits a study area and uses traps to capture a group of individuals alive. Each of these individuals is marked with a unique identifier (e. g. , a numbered tag or band), and then is released unharmed back into the environment. Sufficient time is allowed to pass for the marked individuals to redistribute themselves among the unmarked population. Next, the researcher returns and captures another sample of individuals.
