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Investigating the effects of temperature on the heart rate of Daphnia. Introduction Daphnia is the name of a group of small, aquatic crustaceans commonly called 'water flies'. Because their exoskeletons are clear it is possible to watch daphnia hearts without cutting them open. This also allows the changes in daphnia heart rate to be studied quite easily. As temperature has been chosen as a variable, it must be considered that daphnia are cold-blooded animals, they do not thermo regulate. This means that their body temperature is the same as the water they are floating in. Daphnia Source: www.bioweb.lu/sapro/Daphnia.gif Anatomy of daphnia: 1. Antenna, used for swimming and sensing the environment. Also they are used for gathering food. 2. Eye controlled by muscles with nerve connections to the brain 3. A heart that pushes clear fluid around the body 4. A brood pouch for incubating young that hatch from yolk filled eggs 5. An intestine where ground up food particles are...

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