Lab Report

Testing the Heart Beat of Daphnia Crustaceans Under Different Water Temperatures

Problem Statement: How does changing the temperature of water affect the heart beat of a daphnia?

Method and Materials: click here

 

Hypothesis:

 Temperature: Beats Per Minute:
 Warm Water 110 bpm
Control Water 195 bpm
Cold Water 160 bpm

Results:

Control:
Daphnia # Person 1 Person 2 Person 3 Person 4 Average
Daphnia 1
186 bpm 192 bpm 174 bpm 180 bpm 183 bpm
Daphnia 2 192 bpm 192 bpm 204 bpm 192 bpm 195 bpm
Daphnia 3 180 bpm 186 bpm 186 bpm 186 bpm 184.2 bpm
Average beats per minute for daphnia under control water: 187.4 bpm

 

Warm:
Daphnia # Person 1 Person 2 Person 3 Person 4 Average
Daphnia 1
198 bpm 186 bpm 168 bpm 186 bpm 184.5 bpm
Daphnia 2 198 bpm 210 bpm 204 bpm 198 bpm 202.5 bpm
Daphnia 3 204 bpm 204 bpm 204 bpm 210 bpm 205.5 bpm
Average beats per minute for daphnia under warm water: 197.5 bpm

Cold:
Daphnia # Person 1 Person 2 Person 3 Person 4 Average
Daphnia 1
162 bpm 168 bpm 144 bpm 150 bpm 156 bpm
Daphnia 2 138 bpm 132 bpm 132 bpm 126 bpm 132 bpm
Daphnia 3 138 bpm 150 bpm 126 bpm 144 bpm 139.5 bpm
Average beats per minute for daphnia under warm water: 142.5 bpm


Discussion: Click here for Analytic Essay

Conclusion: click here

 

 

Extra Notes:
While conducting our results, we recorded the beats per minute on the daphnia for ten seconds. We then multiplied that number by 6 to get how many beats per minute. The data for Person 1, 2, 3, etc shows the number they counted per 10 seconds multiplied by 6.

Originally, we planned on conducting the daphnia's heartbeat under a VERY cold water temperature (o degrees Celsius). We were unable to do so for the following reasons.
1. Our daphnia were dying rapidly. The babies they reproduced were of a different species. Similar to when insects reproduce.
2. The few daphnia we tested which were still alive were not able to keep their heart beating when 0 degrees Celsius water was put on them.

 

We would like to thank Molly, Will, Kati, Mike, and the various other classmates who helped us count the daphnia's heartbeats per 10 seconds. Their participation in our experiment was much appreciated. They stand for Person 1, 2, 3, and 4.

 

 

 Background Essay

 Method and Materials

Hypothesis

Lab Report

Analytic Essay

Conclusion

Experiment

Diagram

Photos

Video

Links

Enhancement

Animation

Bibliography

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