BIOL 140 Study Guide - Artemia Salina, Diel Vertical Migration, Chi-Squared Distribution
Document Summary
Site selection of artemia salina upon stimulus of high light intensity. Artemia salina is known to demonstrate negative phototaxis behaviour when exposed to high light intensity above the threshold level. We attempted to determine the threshold range by exposing the replicates to varying intensities of light. Chi-square method was used to calculate and compare the significance of the results. The discrepancy of results can be explained by various mechanisms and also differences in experimental design. Our alternative hypothesis was rejected by all four trials . The chi-square values found are 1. 67, 0. 08,4. 88, and 5. 132 respective of the order of trials . As they are all less than the critical value of 5. 99, we concluded to fail to reject the null hypothesis. However, we saw a pattern in the organisms" responses in accordance with our prediction which was that the zooplankton will start to move away as soon as the photoreceptors in the compound eyes detect an undesirable light intensity.
