1. 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?
2. 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, n1, n2, and m2.
• What criteria are used to determine when the normal approximation can be used to develop confidence intervals for N?
3. 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?