Mark-Recapture

- Read these notes and consider the items below.
- Who popularized the use of single-census mark-recapture to estimate abundance in fisheries?
- What would n
_{.1..}represent? What is an alternative symbol for this value? - Be prepared to discuss the sampling (i.e., how fish are handled, how data is recorded, how many sample are taken,etc.) required for estimating abundance with the Petersen method?
- Define N, M, n, and m.
- What equation is used to estimate N?
- What is the fundamental assumption that leads to the derivation of the equation used to estimate N with the Petersen method?
- What are the rules for determining which distribution is used to construct a confidence interval for N?
- Why did Chapman modify Petersen’s equation?
- What is the equation for the Chapman Modification of the Petersen method?
- What are the five assumptions for the Petersen (and related) methods?
- What precautions do fisheries technicians take to attempt to have a “closed” populations?
- What are common behaviors of fish that lead to a violation of the assumption of equal catchability?

- Read Section 8.3.1 in Hayes
*et al.*(the complete reading) and consider the items below.- What are the six assumptions for the Petersen (and related) methods?
- What is the equation for the Chapman Modification of the Petersen method?
- Define N-hat, n
_{1}, n_{2}, and m_{2}. - What criteria are used to determine when the normal approximation can be used to develop confidence intervals for N?

- Read Section 9.2 in
*Introductory Fisheries Analyses with R*and consider the items below.- What is the equation for the Chapman Modification of the Petersen method?
- What are the five assumptions for the Petersen (and related) methods?
- What R function is used to compute the Petersen (or related) estimates of abundance?
- What argument must be included to specifically use the Chapman modification of the Petersen method?
- This function can accept “data” in two ways. What are those two ways?
- What function is used to extract the actual population estimate from the results of the main function?
- What function is used to extract the confidence interval for the population estimate from the results of the main function?