Daphnia

Subject Organisms For this experiment, I used Daphnia magna and Daphnia pulex that was cultured from stocks from Aquatic Bio Systems Inc. (Fort Collins, CO). Each species was cultured individually in 900 mL glass jars filled with moderately hard water. I created moderately hard water using the recipe as follows: 0.473 g CaSO4 , 0.959 g NaHCO3 , 1.223 g MgSO4 • 7H2O , and 0.039 g KCl per 10 L of deionized water. All references to water for the remainder of the paper refers to moderately hard water unless otherwise stated. These daphnid cultures were fed 2 mL of algae (Selenastrum capricornutum) containing 3.0 x 107 cells per mL on Monday, Wednesday, and Friday. The water was changed every Friday. Once a month, 1 mL of a yeast and trout chow…

how water flea, (Daphnia magna) a transparent aquatic organism whose heart can be easily identified using a compound light microscope, was used to study the effects of caffeine and alcohol on heart rates. According to the research alcohol was observed to have caused a decrease in the heart rate of Daphnia magna while caffeine caused an increase in the heart rate. Introduction Daphnia magna is the name of a group of small aquatic crustaceans commonly called water fleas. They belong…

flea, called Daphnia Magna. All of this matters and is important to know about because it is key to understand the background of the experiment beforehand. This investigation relates to past research based on the…

Discussion Our results supported the alternate hypothesis that Atrazine affects the geotactic movement of Daphnia (Table 1). The pesticide we used disrupted the natural behaviors of Daphnia, and thus affected their performance. These results were expected since Atrazine is a powerful weed –killer that have the abilities to disrupt the nervous system in human and animals, this is why the Daphnia displayed a vertical movement when they placed in the Atrazine solution, which was an…

home. Some of the biggest pollutants that effect our water systems today are antifreeze from cars, cigarette ash and not to mention pesticides that run off from the fields. We know the effects of these harmful chemical substances can be deadly to humans but how does it alter the lives of the creatures living in the water? Some of the smallest living species in the water is known as Daphnia Magna. Similar to the size of a flea, how would chemicals so harmful to humans react to something as small…

The Effect of pH levels on the Motility of Daphnia in Lake Ecosystems Introduction: The production, transportation, and use of chemicals by chemical industries can result in chemical pollution. This leads to a harmful effect on ecosystems and their balance of life (Linlin, Chen, 2012). The pH levels of aquatic environments are important because it affects the physiology of animals by changing their behaviors. The ion concentrations associated with the water and the organism’s survival can also…

the heart rate of Daphnia pulex Introduction In this experiment the effect of caffeine on the heart rate of Daphnia will be tested by use of a microscope and caffeine solution. Daphnia pulex is a crustaceous animal found in the ocean. There internal organs can be visible to observe because their body is translucent. This would be interesting because we could see how the effect of caffeine effects the heart rate of humans as well. Carrie miller from university of Michigan states on the website…

caffeine on Daphnia magna Lee Phan Lab Section: P0501 1000587723 1. Materials and Methods: Preparation: Clean 3-well specimen chambers were kept in ice and a cooling chamber was then prepared to be put under the microscope, by filling it with ice and a small volume of water. This was done to ensure the temperature would remain around 15 degrees Celcius, which could keep Daphnia magna efficiently cool. Furthermore, the different concentrations were prepared in separately labeled eppendorf…

Background & Objectives: Arthropods have neurogenic hearts, which have pacemakers as part of the nervous system found outside the heart. Vertebrates and molluscs have myogenic hearts, where the pacemaker is composed of specialized cardiac muscle within the heart. Daphnia is unique as it is a cladoceran crustacean reported to have a myogenic heart. To test this, use drugs known to change heart rate in myogenic hearts and observe if they have the same influence on Daphnia. Methods: Used a…

Name:Neko Science Fair Paper Daphnia Magna are small water fleas that are native to Minnesota. They are an indicator of good water quality ( Science buddies,2010 ). Daphnia Magna are small enough to be eaten by dragonflies, and are food for many small to medium sized fish. The reason that we should be paying attention to Daphnia Magna is because of pollution in our lakes. This pollution can affect a lot of actions that we do in our daily lives. Pollution can lead to mutations in fish, frogs…