Duckweed population growth lab answers

The paper will examine survivorship of riparian trees in the San Gabriel Mountains. The Introduction and Method sections this paper is due Sunday 5th, and the final complete paper is due Sunday, April 19th

· Calculate k and r

Duckweed Lab:

An Experimental Study of Population Growth

able 1: Data sheet for recording duckweed population growth. A, B, and C represent the control or distilled water treatments, while D, E, and F represent the fertilizer treatments. Twice a week, count the number of individuals (N) in each cup and record them below.

Thus far, each group has uploaded their completed duckweed data onto Moodle. For statistical analyses, these data should be compiled together and reorganized. As with the previous lab, I have done the former but you have to do the latter. Before you begin, download the Class Data Excel spreadsheet from Moodle. Also make sure that K and r were calculated correctly.

15. First, calculate the average population of all groups’ Treatment 1 (all control; A, B, and C together) from the initial day.

16. Then, repeat the process for each day of Treatment 1. You should have a total of nine averages.

17. Do the same for Treatment 2 (fertilizer treatments or D, E, and F together).

18. Then, graph the growth curve of Treatment 1 and Treatment 2 using the class averages. Remember which axis the independent variable goes. The graph should have two growth curves, which are Treatment 1 and Treatment 2 averages per day.

19. Next, perform an ANOVA comparing K between the treatments and construct a graph that shows this comparison with the appropriate error bars.

20. Finally, perform an ANOVA comparing r between the treatments and construct a graph that shows this comparison with the appropriate error bars.

Specific requirements for the final paper

Introduction: Below is an outline of how the Introduction for this paper should be organized and what information should be included. Be sure to use scientific literature to support your explanations.

· Start with a paragraph that broadly explains what the experiment is about. What is the main idea of the experiment and why is it important to test? Think about the big picture of this second part of the class.

· The next paragraph should be about growth curves. Explain what growth curves are and how they relate to the main idea of the experiment.

· The third paragraph should introduce the experimental system. Why is Lemna minor an ideal organism for the experiment? What can it tell us about growth curves and the main idea? How might the treatments affect the growth curves?

· The last paragraph should explain how experimenting on Lemna minor will help us understand growth curves and the main idea (What is your objective?). Don’t forget to include your biological hypothesis and make sure your references in the previous paragraphs back it up.

Results: Below is a list of specific figures that need to be included in the final paper.

· A figure showing the class average growth curves of Treatment 1 and 2.

· A figure comparing the class average of K between Treatment 1 and 2. Be sure to include the appropriate error bars that match the results of the ANOVA.

· A figure comparing the class average of r between Treatment 1 and 2. Be sure to include the appropriate error bars that match the results of the ANOVA.