Discussion of sea turtle pop. matrix model paperBio 41E (Karnovsky) guest lecture,Jason Price, PhD2011-03-23

3 part approach: ① Overview/Main Results & Conclusions

② Key details (Figures & Tables)

③ Big picture: Contribution to the field

Crouse et al. 1987

Part 1 Breakout: Paper overview

① What were the authors’ goals?

② What methods did they use?

③ What were the main results?

④ What did they conclude?

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

Crouse et al. 1987

Key Details: Stage Class Pop Matrix

0% 0 0 0 127 4 80

67% 73%          

  5% 66%        

    1% 69%      

      5% 0%    

        81% 0%  

          81% 81%

Crouse et al. 1987

Pg 1415

Fig 1

Crouse et al. 1987

How do they improve on Fig 1?

Crouse et al. 1987

Fig 3 Fi Pi Gi Proportional sensitivityCrouse et al. 1987

Within-stage Survival

Fecundity

Between-stage survival

How improve on Fig 3?

Crouse et al. 1987

Crouse et al. 1987

To stage specificsurvival probability

To changes in stage duration

Fig 4 pi di Proportional sensitivity

What other key details did you notice?

Crouse et al. 1987

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