Title

The Effect of Dihydroxyacetoneon the Heart Rate and Mortality Rate of Daphnia magna

Author(s)

Ella Blalock

School Name

Spring Valley High School

Grade Level

10th Grade

Presentation Topic

Environmental Science

Presentation Type

Non-Mentored

Abstract

The purpose of this study was to understand the effects that different brands of sunless tanners containing dihydroxyacetone have on the mortality and heart rate of Daphnia magna. It was hypothesized that if the sunless tanners were introduced to the environment of the Daphnia magna, then the mortality rate of the Daphnia would be greater than the control group exposed to no self tanners, moreover, due to Jergens Natural Glow Instant Sun Deep Bronze having a darker coloring indicating higher levels of dye, this sunless tanner would lead to the lowest heart rate and highest mortality rate. Each self tanner was added to a separate bowl that contained 10 Daphnia magna each day for a total of 4 days. The Daphnia magna's heart rate and living population were recorded each day. L'Oreal Paris had the highest mortality rate with an average of 10 Daphnia alive on day 1, 2 Daphnia alive on day 2, and 0 Daphnia alive on days 3 and 4. L'Oreal Paris also had the greatest heart rate decrease, starting with an average of 257.1 bpm on day 1, to 9.9 bpm on day 2, and 0 bpm on days 3 and 4. p< 0.00001 for the one-way ANOVA on heart rate, and p = 0.00085, and both were significant because p < 0.05. In conclusion, the hypothesis was not supported because L'Oreal Paris had the highest mortality rate and lead to the greatest decrease in heart rate and the hypothesis stated that Jegen's would have the highest mortality rate and greatest decrease in heart rate. In addition, all sunless tanners caused the population of Daphnia to decrease as well as the heart rate.

Location

Furman Hall 229

Start Date

3-28-2020 8:30 AM

Presentation Format

Oral and Written

Group Project

No

COinS
 
Mar 28th, 8:30 AM

The Effect of Dihydroxyacetoneon the Heart Rate and Mortality Rate of Daphnia magna

Furman Hall 229

The purpose of this study was to understand the effects that different brands of sunless tanners containing dihydroxyacetone have on the mortality and heart rate of Daphnia magna. It was hypothesized that if the sunless tanners were introduced to the environment of the Daphnia magna, then the mortality rate of the Daphnia would be greater than the control group exposed to no self tanners, moreover, due to Jergens Natural Glow Instant Sun Deep Bronze having a darker coloring indicating higher levels of dye, this sunless tanner would lead to the lowest heart rate and highest mortality rate. Each self tanner was added to a separate bowl that contained 10 Daphnia magna each day for a total of 4 days. The Daphnia magna's heart rate and living population were recorded each day. L'Oreal Paris had the highest mortality rate with an average of 10 Daphnia alive on day 1, 2 Daphnia alive on day 2, and 0 Daphnia alive on days 3 and 4. L'Oreal Paris also had the greatest heart rate decrease, starting with an average of 257.1 bpm on day 1, to 9.9 bpm on day 2, and 0 bpm on days 3 and 4. p< 0.00001 for the one-way ANOVA on heart rate, and p = 0.00085, and both were significant because p < 0.05. In conclusion, the hypothesis was not supported because L'Oreal Paris had the highest mortality rate and lead to the greatest decrease in heart rate and the hypothesis stated that Jegen's would have the highest mortality rate and greatest decrease in heart rate. In addition, all sunless tanners caused the population of Daphnia to decrease as well as the heart rate.