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Pill Bug Lab Report

1574 words - 6 pages

Food Preferences in the Sow Bug (Porcellio Laevis)PurposeThe purpose of this experiment is to determine what kind of food the sow bug prefers; decaying leaves, potatoes, grapes, or sow bug food.HypothesisIf a sow bug is placed in a choice tray, and has access to decaying leaves, potatoes, grapes, and sow bug food, the sow bug will choose the decaying leaves over its other options. This hypothesis was based on research stating that a sow bug's main food source is decaying vegetation. This is the food they are accustomed to and therefore will select over the other three options which they rarely if ever would have access to.Materials-Twelve sow bugs-Bisected grapes-Chunks of potato-Decaying leaves-Pinch of sow bug food-Choice tray (with cover)-Five pieces of moist filter paper-Four small rocksProcedure1. Place moist filter paper in choice tray (one in each section2. Place each of the experimental food sources in the outer four sections of the choice tray3. Position one rock at each of the entrances to the outer sections of the choice tray4. Place twelve sow bugs in the center section of the choice tray5. Wait ten seconds6. Simultaneously remove all four rocks7. Place cover on choice tray8. Wait five minutes9. Uncover choice tray and place rocks at the entrances of the outer sections10. Count the number of sow bugs in each section11. Remove rocks and place cover on choice tray12. Repeat steps 9 through 11 every five minutesResultsSow Bug Apparent Eating PreferencesData TableTime Leaves Grapes Sow Bug Food Potato Control Total0 Minutes 0 0 0 0 12 125 Minutes 3 1 0 1 7 1210 Minutes 6 0 0 1 5 1215 Minutes 5 1 0 0 6 1220 Minutes 7 0 0 1 4 1225 Minutes 7 0 0 0 5 12The results of the experiment show which kind of food the sow bugs choose over the others. The sow bugs went to the section of the choice tray with the leaves more than any other section. A lot of them, although not as many as in the decaying leaves section, remained in or moved back to the control section. The sow bugs at least entered the sections with the potatoes and grapes. For three of the times the position of the sow bugs was checked, there was one sow bug in the section with the potatoes. For two of the times the position of the sow bugs was checked there was one sow bug in the grapes. None of the sow bugs went into the section that contained the sow bug food during the times at which their position was checked.DiscussionThe data collected from the experiment on what sow bugs prefer to eat when given the choice of potato, grapes, sow bug food, and decaying leaves was superficially resolute. It was very supportive of the hypothesis that the sow bugs would prefer the section of the choice tray with the decaying leaves. The data collected showed that a greatest number of sow bugs were in that section. If examined with the objective of determining which food the sow bugs preferred, the data indicates that their preference was the decaying leaves.However, taking other variables into...

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