sarcophaga bullata
...sibility to reproduce and start the cycle over. (1) In this experiment based on prior knowledge, if Sarcophaga bullata is exposed to high intensity light and low intensity, it will move toward the higher intensity end. In the second experiment we will be exposing the larvae to different wavelengths of light. I believe it will be attracted to the blue light over the other wavelengths. Materials In this experiment we used a strip of cloth towel wich we moistened and layed in our “racetrack.” At each end of the track we put a small cup to catch the larvae that fall off. At one end of the track we put a light on low power pointing directly down the track. At the center of the track the light intensity must be 9 (fc) . We then recorded the intensity at both ends of the track. We placed ten larvae in the center and timed them for 2 min to see which aend they move t, then recorded how many were at each end when the time was up. We repeated this trial 3 more times, each time moving the light to the opposite end to ensure that the larvae didn’t prefer one end over the other. In the next part of the experiment we changed on variable, we changed the wavelengths of the light to see which wavelength the larvae preferred. We used three different wavelengths, red, blue, and green. For each trial we would place one color at each end of the track and use the same procedures as in the first experiment. We did three trials with each set of colors and recorded the results. Results In our first experiment we used just while light. The larvae were more attracted to the high intensity light. We ran 4 trials with high intensity light at one end. On the first trial 90% went to the high intensity end while 10 % went to the low end. On the second trial 100% of the larvae moved to the high end. On the third trial 90% went to the high end while 10% went to the low end. On the fourth trial all 100% went to the high end. As a whole experiment it ended up being 95% moved to the high end and 5% went to the low end. As a class The results were the same in percentages. In the next experiment we tested the different wavelengths. When we tested rd and blue together, we did three trials. In all three trials 100% moved to the blue end. Next we tested blue and green. In the first trial it was 50 % both ways. In the second trial 60% went to the green and 40% went blue. In the third trial 80% went blue and 20% went green. In the fourth trial 60% went blue and 40% went green. Next we tested red and green. In all trials 100% moved toward the green light. As a whole experiment 53% moved to the blue end, 47% went to the green end and 0% went to the red end. Throughout the first experiment the temperature, and the light intensities were measured. The temperature stayed at a constant 22 degrees celcius. The light intensity at the high end averaged out to be 36.2 (fc) and at the low end was 4.4(fc). In the second experiment the temp stayed at 22 degrees celcius. The light intensity for the blue light was76.9(fc), red was 88.2(fc), and green was 71 (fc). Discussion The data collected from both experiments led me to accept only one of my hypothesies. With 95% responding with a photopositive taxis to high intensity light, gave me strong evidence to believe that they were attracted to the source of stimuli. In experiment two we used red, blue, and green light. 53% responded to blue, 47% responded to green and 0% went to red. With these results I didn’t have strong enough evidence to accept or reject my hypothesis. Though I couldn’t accept or reject it, I still saw certain tendencies. There was a pattern that they did go to the blue or green light over the red light. Though more attracted to blue in our experiment it may be different the next time. There may be different variables that affected the way the results turned out. This is why we changed some of these variables throughout to try to avoid some of these problems. We moved the light at the start of each new trial to the other end to make sure the maggots weren’t just attracted to one side. We controlled the light intensity also to make sure it wasn’t higher or lower in the middle of the track to ensure they weren’t manipulated to go one way or the other at the start. The temp was another variable that didn’t change. Based on the data the temp had no affect wh...