Phototaxis and Hydrotaxis effect on Armadillidium vulgare

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Introduction A hummingbird is attracted to bright colors, a bat feeds at night, and mice are attracted to warm dark places. Why is this and how do we explain these actions? Ethnology is the study of animal behavior. Animal behavior is observed through a species sensory response to stimuli which are categorized under innate and learned behavior. Innate behavior is an unlearned, inherited fixed action pattern, while learned behavior is not inherited but gradually ascertained throughout the life span of a species. Methods and Materials Seven experimental apparatus’ were constructed, like the one in figure 1. Two petri dishes were cut so as to be connected at one end then glued together on a small portion of wood blocking. The petri dishes simulate the testing environment and the connected end allows the specimens to move freely in between scenarios. First the phototaxis experiment was conducted by placing five Armadillidium vulgare in each side of the petri dish for a total of ten in the overall created environment. With no other variances added to either side, one petri dish was covered with a black cloth and the other was left exposed to light. The apparatus was then left undisturbed for ten minutes. After the elapsed time, the result of each specimen’s orientation was recorded and pooled for all seven of the experimental environments. Results There were notable differences between each test. Figure 2 demonstrates the actual results of the three separate experimental tests. The error bars suggest that there could be significance in the results but closer examination of the statistical data suggests otherwise. Table one compares the values of the statistical tests for each experiment. The phototaxis experiment resulted in a higher number of Armadillidium vulgare found in the light side of the experimental environment than in the dark side of the

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