The Effect Of Temperature On Daphnia By Changing Ph Levels And Measuring The Hear Rate

1419 Words May 11th, 2016 6 Pages
This experiment is being done to show the effect oh pH levels on daphnia by changing pH levels and measuring the hear rate.
Daphnia magna are commonly used to test water toxicity, they are a vital part of fresh water ecosystems. They serve as a crucial role in food webs as they are a food source for smaller fish and invertebrates, and they also are a consumer of algae and bacteria (Elbert, 2005). They range from 2-5mm long these small crustaceans are also referred to as water fleas. Daphnia belong to the group called Daphniidae, which is a relative of freshwater shrimp. It is easy to see the internal organs of daphnia because of a transparent taco shell like carapace. A carapace is the hard outer part of a shell or covering turtles also have a carapace. A daphnia’s life span can range between 1-56 days. (Elenbaas, 2013; Clare 2002). The comfortable pH for daphnia is between 7.2 and 8.5 (Clare, 2002).
In this experiment different pH’s ranging from 3 to 11 were used to test the effect of heart rate of daphnia’s. The pH scale ranges from 0 to 14. A pH ranging from 0 to 6 is acidic a pH of 7 is neutral a pH higher than 7 ranging from 8 to 14 is basic. PH revolves around hydrogen ions (H+). The reason pH’s can be acidic, basic, or neutral is because acids give hydrogen ions away while bases accept hydrogen ions. (Decelles, 2002).
This experiments intention was to measure the different pH levels effect on the heart rate of daphnia. The objective of this…
Open Document