The document discusses a guest lecture about a 1987 paper by Crouse et al. that developed a population matrix model to analyze the population dynamics of sea turtles. The model used parameters like fecundity, growth and survival rates between stages to construct a stage-class population matrix. It found that survival and fecundity had the highest proportional sensitivity. The model improved understanding of sea turtle populations and how changes in vital rates could impact them.

1. Discussion of sea turtle pop. matrix model paper Bio 41E (Karnovsky) guest lecture, Jason Price, PhD 2011-03-23

2. 3 part approach: Overview/Main Results & Conclusions Key details (Figures & Tables) Big picture: Contribution to the field Crouse et al. 1987

3. Part 1 Breakout: Paper overview What were the authors’ goals? What methods did they use? What were the main results? What did they conclude? Crouse et al. 1987

4. Crouse et al. 1987 Part 2Key Details: Parameters pg 1415 when λm= er= 1, r = 0 = stable pop. Size ε= elasticity = Proportional senistivity = differentialΔλfor same amnt of Δ in parameter Parameters Fi = reproductive output (think Fecundity) Gi = prop. of indiv Growing to next stage Pi = prop. of indiv surviving within stage (Di = prop of indiv. Not surviving) pi = annual survival probablility di = stage duration

5. Crouse et al. 1987 Key Details: Stage Class Pop Matrix Pg 1415

6. Crouse et al. 1987 Fig 1

7. How do they improve on Fig 1? Crouse et al. 1987

8. Crouse et al. 1987 Fig 3 Fi PiGi Proportional sensitivity Within-stage Survival Fecundity Between-stage survival

9. How improve on Fig 3? Crouse et al. 1987

10. Crouse et al. 1987 Fig 4 pidiProportional sensitivity To stage specific survival probability To changes in stage duration

11. What other key details did you notice? Crouse et al. 1987

12. Part 3 Big Picture What did you learn (beyond main results)? What is the value of using life tables? Why were you assigned this paper? / What makes it exceptional? What question would you ask Crouse if you had been present at her PhD defense? Crouse et al. 1987