lab 2 Daphnia

lab 2 Daphnia - David Martin The Effect of Temperature and...

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David Martin The Effect of Temperature and Epinephrine on Daphnia’s Heart Rate I. Introduction The Daphnia is sometimes called a water flea is a genus of Crustaceans that is found abundantly in small bodies of fresh water. Some of these are just large enough to be seen without a microscope in good light. (West, 1998) It is usually found in fresh water, although there are some that live in salty water. This creature is a genus of crustaceans and plays an important role as an herbivore, thus it is an important link in the aquatic food chain. (Parr, 2002) Daphnia has a flexible life history that allows it to respond to the changeable surroundings. (Pears, 1997) Its interesting physical features are helpful in observing its internal body movement, which is helpful in determining the affects of epinephrine on the heart. Daphnia are exothermic animals as opposed to endothermic whose body temperature is maintained by homeostasis. Exothermic or cold-blooded organisms cannot maintain their body temperature and therefore any climate change affect them significantly. Homeotherms maintain a constant body temperature and metabolism until environmental temperatures drop thus metabolism increases with drop in temperature to maintain high body temperature. The increased metabolism at low temperature is a resistant adaptation for many warm-blooded organisms since it can’t usually be maintained indefinitely. It will be interesting and uncomplicated to study how temperature affects such creature because any sort of environmental change is bound to produce a result in this experiment. (Transmed Network Corp., 2001). They are bilateral and have an open circulatory system. This means that the blood floats around freely through the body cavity. Crustaceans are very important members of aquatic ecosystems. Daphnia harvest smaller plank tonic organisms including the photosynthetic forms and serve as food organism for many larger animals. (Engemann 1999) Daphnia is small and transparent. With this animal, one can study a number of environmental effects upon the action of the heartbeat. It is also a useful organism for studying the effects of drugs on the heart. It is a type of small crustacean and is generally 0.2 to 3.0 mm long. Its body is not distinctly segmented, but an important feature of its anatomy is the carapace (a folded shell-like structure which covers the animal and opens
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lab 2 Daphnia - David Martin The Effect of Temperature and...

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