Daphnia Lab

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Abstract: The Daphnia magna, also widely known as the common water flea, is a freshwater crustacean that assumes a vital environmental role and is a significant model creature for different aspects of the scientific world (Ghazy et al., 2009). The purpose of this lab was to study the response of the genus Daphnia to exposure to different salinity levels. It was hypothesized that as the salinity levels increased, the survivorship of these organisms would decrease. In order to determine this, the salinity levels of each jar were taken into account along with the initial and final amount of Daphnia placed in each jar. With the final mean percentage used to signify the survivorship, it was determined that salinity levels play a crucial role in …show more content…
This process was replicated thrice. Results: After conducting the experiment, the Daphnia magna were seen to have a lower survivorship as the salinity levels increased. With a combined total of 27 Daphnia placed in the 0 ppt jars, the survivorship rate was 66.67% as 18 survived the 20 minutes. Of the combined total of 19 Daphnia placed in the 10 ppt jars, the survivorship rate resulted in 31.58% as only 6 survived. Lastly, with an initial total of 18 Daphnia placed in the 35 ppt jar, none of the Daphnia survived the final jar after the 20 minutes, resulting in a mean percentage of 0%. With that being said, the results of the final data set support the hypothesis as it is seen that salinity concentration impacts the survival of these organisms. Discussion: To answer the guiding question of “How does salinity affect survivorship in Daphnia magna?”, we can refer to the hypothesis created in which we agreed that the survivorship of the Daphnia will lower as the concentration of salinity increases. To support this, a study was conducted and proven by the initial and final count of survivorship after a 20-minute period, along with two replicates to further solidify the
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