Depletion Estimates

- Read Chapter 10 in
*Introductory Fisheries Analyses with R*and these notes and consider the items below.- Define N
_{0}, K_{t-1}, N_{t}, C_{t}, f_{t}, q, and E_{t-1} - What is the equation for the Leslie model? What type of equation is this?
- How is q estimated from the Leslie model?
- How is N
_{0}estimated from the Leslie model? - Geometrically, how is N
_{0}represented? - What was Ricker’s suggested modification to the Leslie model?
- What are the six assumptions of the Leslie model?
- Which assumptions are most likely to be violated? Discuss why.
- What is the equation for the DeLury model? What type of equation is this?
- How is q estimated from the FeLury model?
- How is N
_{0}estimated from the DeLury model? - When should the Leslie model be used in comparison to the DeLury model?
- What R function can be used to fit the Leslie and DeLury methods in R?
- How is the population abundance and catchability estimates extracted from the results of this function.
- How are confidence intervals for the population abundance and catchability estimates extracted from the results of this function.
- What R function is used to perform a K-pass removal estimate?
- How is the population abundance and probability of capture estimates extracted from the results of this function.
- How are confidence intervals for the population abundance and probability of capture estimates extracted from the results of this function.

- Define N
- Read Rosenberger’s Box 11.1 in Pope
*et al.*(2010) (the complete chapter is here) and consider the items below.- What is a primary assumption of the removal method?
- Describe a common behavior of fish that leads to a violation of this assumption?
- What does this particular assumption violation mean for the estimates of abundance and catchability from the removal method?
- What is the author’s argument for how biased results from the removal method could still be useful?
- However, how does the stated findings from the Rosenberger and Dunham (2005) study go against the previous argument?