~~BioG 103 - Study Abstract

~~BioG 103 - Study Abstract - In our experiment we placed...

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November 26, 2007 The Effect of Light Intensity on Sarcophaga sp. Abstract: Previous literature has shown that Sarcophaga larvae possess a single photoreceptor, located on the anterior end of the organism. Because of this feature, Sarcophaga larvae are very photosensitive creatures; they exhibit a well-developed negative taxis to light. The purpose of this study was to compare the overall movement of Sarcophaga larvae at different light intensities. Using the afore-mentioned facts as a guideline, we designed an experiment to test whether or not light intensity affects Sarcophaga larvae displacement. The hypothesis tested was that Sarcophaga larvae displacement would be greater at higher light intensities than in darkness.
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Unformatted text preview: In our experiment, we placed larvae beneath controlled beams of light of different known intensities. After one minute in the light, the final larval position was marked and the displacement measured from the initial starting location. The data colleted was compared to the overall displacement of Sarcophaga larvae in complete darkness. In the end, we found a relationship between light intensity and larval displacement. Upon conducting a Wilcoxon Signed Rank Test, the results revealed that the mean displacement of Sarcophaga larvae significantly increased at the tested light intensities compared to the mean displacement at no light. Our hypothesis was proved through completion of this laboratory experiment....
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