C Which of the following studies was NOT an example of logistic population

C which of the following studies was not an example

This preview shows page 3 - 5 out of 5 pages.

C. Which of the following studies was NOT an example of logistic population growth? i. Black noddies on Heron Island off the coast of Australia (exponentially) ii. The human population in West Virginia iii. Tazmanian sheep in Australia iv. Barnacles v. None. All are examples of logistic population growth D. Describe an example of directional natural selection. Your answer could involve a description of 1) the evolution of horses, 2) wing color in the peppered moth, 3) insecticide resistance in insect pests, 4) spot number in guppies, or any other published study that you may be aware of. You do not need to know the authors’ names or the year of the study, but you should be able to tell me how directional natural selection was demonstrated in your chosen example. NOTE: you cannot make up an example. It must be a published example. 6. Computing a life table is a guarantee on this exam (about 20% of your grade). You are responsible for knowing all calculations necessary to fill out a life table. The necessary components of a life table are x , n x , l x , and b x . These are the only variables you need to be able to compute growth rates ( r or R 0 ) and generation time ( T ). For r , R 0 and T , I will provide you the equations. 7. For any questions pertaining to the calculation of geometric, exponential or logistic growth models, I will provide you with the equations. That doesn’t let you off the hook. You should still know everything else about these models, including what they predict, what assumptions they are based upon, examples of populations that show these patterns of growth, etc. 8. Pay particular attention to the distinction between the population growth parameters: r(or rmax), R0, dN/dt, dN/Ndt. At what time scale is growth measured? When do you use R0(logistic)or r (exponential)? 9. For r -selection and k -selection theory, know the following: 1) what does natural selection favor in each case Favors highest r and highest k 2) under what circumstance (environmental conditions) should each type of selection be expected to occur, r selection: low density frequent disturbance harsh environment k-selection high density many competitors stable environment “Opportunistic/weedy species” “Equilibrium species” 3) what are the consequences for the loser in each type of selection, k- absolute extinction r- relative extinction 4) what kind of traits should r and k selected species possess 5) an example of a species that is either r or k selected. r- E.coli and cockroaches k- humans and elephants 3
Image of page 3
6) an example of a species that doesn’t fit perfectly into this dichotomy. Goldenrods are part of k because they’re group competitors and salmon give birth and die 10. For all topics that I have discussed in class I have tried to give examples from nature. For example, global human and black noddy populations grow in an exponential fashion. Make sure that you can
Image of page 4
Image of page 5

You've reached the end of your free preview.

Want to read all 5 pages?

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture