Isopod Lab

Methods

In this experiment, the moisture preference of the isopod Armadillidium vulgare was tested. A 6 x 12 in. plastic container was used. In the first test 3/4 of the container was filled with dry soil while the other 1/4 of the container contained wet soil. An isopod was placed at the far end on the dry soil and we timed how long it took the isopod to get from the wet soil to the dry soil. This was repeated with 5 different isopods. In the next test, 3/4 of the soil was wet and 1/4 of the soil in the same container was dry and we timed how long it took an isopod to get from the far end of the wet side to the dry soil. This was again repeated with 5 different isopods.

For the data, we took the mean amount of time from each test and used that to perform a T-test. This test was used to determine whether or not the data collected was significant.

Results

The mean amount of time that it took the isopods to get from the wet soil to the dry soil was less than the mean amount of time for the isopods to get from the dry soil to the wet soil.

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The P-value was >0.5 so we accept the null hypothesis that the isopods have no preference between wet and dry soil.

Although for this experiment we accept the null hypothesis, with more replicates the data could become more significant. This could be used for a future experiment.