{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

ESM 211 Homework 4

ESM 211 Homework 4 - ESM 211 Homework 4 Due Friday Mar 14...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
ESM 211 Homework 4 Due Friday, Mar. 14 In this exercise you will analyze a matrix model of loggerhead sea turtles, which comes from the following paper (available on jstor): CROWDER, L. B., D. T. CROUSE, S. S. HEPPELL, and T. H. MARTIN. 1994. Predicting the impact of turtle excluder devices on loggerhead sea turtle populations. Ecological Applications 4:437-445. 1. We will start by analyzing the matrix as presented in the paper: The five stages are: 1. Eggs/hatchlings 2. Small juveniles 3. Large juveniles 4. Subadults 5. Adults Notice that this is a post-breeding census, so that the little bit of reproduction coming from the “subadults” represents the fraction of that class that mature to adulthood just before the breeding season. Enter the matrix into Excel Use PopTools -> Matrix Tools -> Draw Life Cycle to draw the bubble and arrow graph. This is a good way to check that you got the structure of your matrix right. It should look something like: Use PopTools -> Matrix Tools -> Finite rate of increase to find λ 1 . What does this tell you about the viability of the population? Notice that this is a dynamic calculation, so that you can change matrix elements and immediately see the new value of λ 1 . Can you reverse the population decline by completely eliminating the mortality of the egg/hatchling stage (this is what beach conservation efforts focus on)? 1 2 3 4 5
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Use PopTools -> Matrix Tools -> Matrix sensitivity to calculate the sensitivity (S) for each of the matrix elements (notice the checkbox for “calculate sensitivity of non-zero values?” – it should read “zero values” – checking that gives sensitivities for all matrix elements, including the zeros. If the zeros represent
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern