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To investigate the effects of a depressant on the heart rate of a daphnia.
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To investigate the effects of a depressant on the heart rate of a daphnia. Background information Daphnia-What are they and Why use them for Science? Daphnia are also called water fleas. The most common type is called Daphnia pulex. They are are part of the Crustacean group and can be found in lakes, ponds and small streams. The water that they live is full of nutrients, which is called eutrophic. Daphnia are used quite a lot in scientific research and are interesting animals for study under the microscope. They are covered in a transparent shell and all internal organs can be seen which makes it good animal to experiment with. You can also see the beating of its heart. This is very helpful in our experiment, as we need to record the heart rate. Most daphnia are herbivores. Most daphnia feed on bacteria and very small algae. However not all daphnia are herbivores there are...
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