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How Does Daphnia Magna Affect The Environment

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Water pollution is a very prevalent problem throughout the world. It affects ecosystems, deters the natural food chain, and can cause disease in both animals and humans. But is water pollution affecting natural lakes and ponds in local areas? In this experiment, Daphnia magna will be used in a bioassay to find if water from local areas is habitable for aquatic organisms. Daphnia magna are small freshwater invertebrate organisms. They are commonly used in bioassays and experiments because they are sensitive to changes. Their heart rate and what they eat can be monitored through a telescope, since their bodies are transparent. In this experiment, Daphnia magna are used to monitor water pollutants in the water samples. If their heart rate increases and they are not eating, this indicates a high level of stress. Daphnia magna are a food source for many fish. Although they are very tolerant of poor water quality, Daphnia magna are very sensitive to changes in the ionic composition of their environment. Because Daphnia magna are sensitive to changes in their environment, they are being used in this experiment to …show more content…

Direct sources of water pollution include runoff, industrial waste, sewage, and human waste. Indirect sources include air pollution and sediment from construction sites. Industrial waste can lead to air pollution, which can ultimately lead to the pollution of water. This is also called atmospheric pollution. Atmospheric pollution is caused by pollutants such as smoke from factories entering the atmosphere and being carried to waterways. Industrial waste can also create polluted runoff that collects in rivers and lakes. Another reason for water pollution is chemically treated sewage. This water carries harmful chemicals and high amounts of bacteria, which can potentially lead to serious diseases. Runoff from fields can contain chemical fertilizers and pesticides which can pollute

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Data analysis and t-test statistics have supported the hypothesis that Daphnia heart rate would increase when exposed to tobacco extract. Furthermore, tobacco exposure had negatively affected the overall health of the Daphnia specimen. Its heart rate became unusually low, and even after the release to its culture it appeared to be motionless, and possibly died as a result of the experiment. Unfortunately, the concentration of the tobacco extract was unknown, and had it been lower, the effects could have been different. Nonetheless, the experiment was successful due to the supported hypothesis.

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The process was replicated by thirty groups and the following process was kept constant by each group. Thirty daphnia of various sizes were measured through the aid of a light microscope and micrometer scale. These daphnia were then placed into a tank containing a single bluegill fish, which had been kept unfed for a constant amount of times. When the bluegill fish had eaten ten of the thirty daphnia placed in the tank, it was immediately removed from the tank and placed in a beaker containing a narcotic based anesthetic poison. Following the death of the fish, as indicated by the complete halting of its movement the fish, the fish was dissected in order to remove the eaten daphnia and once again measure them using a light microscope.

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Environmental Science and Sustainability (SCI201 -1504A -07) Instructor: Trena Woolridge Unit 4- Discussion Board Amanda Kranning October 27, 2015 Eutrophication is a syndrome of ecosystem responses to human activities that fertilize water bodies with nitrogen (N) and phosphorus (P), often leading to changes in animal and plant populations and degradation of water and habitat quality.(Cloern, Krantz, & Hogan, 2013) Eutrophication forms when an abundance of nitrogen and phosphorus increases growth within an environment.

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A variety of factors can change the heart rate of Daphnia. According to Richard Handy (2012), “The heart rate (which can be up to 300 beats per minute) can be monitored and counted in different conditions – for example changing water temperature, or changing the type

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My 8th grade class went to the Conodoguinet creek to test if there was any pollution in the creek water. Before we went my hypothesis was, “If we go to the Conodoguinet creek and test the water, then the creek will have little to any pollution in it because we haven’t had a monstrous storm in the past few months so there wouldn’t be an excessive amount of acid rainfall or runoff” There are three types of macroinvertebrates ( an invertebrate fauna - animal of a particular region - that can be captured by a soo - which is a certain net or sieve - ) that we were looking for, Group 1 ( which is pollution sensitive - they cannot have any pollution- ), Group 2 ( which is somewhat pollution tolerant - they can live with some pollution-) and Group

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Daphnia are very abundant organisms in freshwater lakes. They tend to live in the upper algae rich portion of the water, feeding on phytoplankton, bacteria and decaying organic matter. Daphnia and bosmina both serve an essential role in he food chain in most lakes, serving as a resource for numerous predators. Trout tend to feed on small crustaceans like daphnia and dosmina. Trout are visual predators and therefore feed on the larger daphnia thus providing bosmina a competitive

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One article states, “…caffeine, surprisingly, has little or no effect on Daphnia heart rate” (ProQuest). Another scientist also published his research saying, “Caffeine could be used to emphasize the need for blind observers because it does not increase heart rate in Daphnia” (BioOne). These findings align with the conclusion we developed based off our statistical

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I tested Daphnias in a different environment with some high concentration of chemicals. The different environment experiment which included the ethanol, caffeine and spring water. Firstly, I used a transfer pipettes to grab a daphnia from its original habitat. Using a glass side on the microscope, I transferred the daphnia in the pipette to the glass slide. Adding 5% of ethanol to the slide enabled me to figure out how the Daphnia will act in that environment.

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The daphnia, similarly to most simple invertebrates does not have red blood cells or lungs. Hemoglobin is responsible for carrying oxygen and nutrients to the blood for daphnia. Hemoglobin production increases under stressful situations for daphnia, allowing survival in low oxygen environments. Daphnia have an open circulatory system, similarly to most other arthropods. Hemolymph is pumped through the hemocoel, a body cavity during circulation.

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Nutrient pollution coming from agricultural runoff and other fertilizers allows for the growth of species that upset the balance of the ecosystem such as Cattail, harmful algae bloom, and duckweed. The sulfur in the agricultural fertilizers leads to accumulation of toxic mercury in fish, birds, and mammals. Also, exotic animals or invasive species displaced native and threatens to disrupt the ecosystem balance. The purpose of this experiment is to determine how the water quality affects the Everglades ecosystem and how water pollution impacts different species. Urbanization is a big threat that contributes to poor water quality in water pollution.

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The purpose of this lab was to change pennies from copper to silver to gold, like alchemists have attempted to do in history. Through the data and observations gathered throughout this experiment, it can be concluded that the pennies were not changed into a different element. For example, the density of the penny from 2005; which was the penny that was experimented on to see whether or not it could turn into silver; was 4.62 g/cm3 before the experiment and 4.89 g/cm3 by the end of the experiment. If this copper penny really would have turned into silver, then the density of the penny would be 10.49 g/cm3; which is the density of silver; by the end of the experiment. The penny may have turned silver in color, but this was only because it was plated in the zinc that was added to the beaker of water in the experiment.

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747 Words | 3 Pages

The Lake Ontario food web has been damaged by over-fishing, fluctuation in nutrient levels, industrial chemicals, agricultural fertilizers, untreated sewage, phosphates from laundry detergents, and pesticides[4]. Some pollutant chemicals that have been found in the lake include DDT, benzopyrene, PCBs, chromium, lead, mercury, and carbon tetrachloride[4]. Conclusion Future research into Lake Ontario’s aquatic health could be to study how the pollution has changed the ways we treat the water from the lake before human consumption. Over the years the water treatment methods have changed to adapt to poorer water conditions and by tracking these changes we may be able to further understand the negative impact that we are placing on the fresh water

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861 Words | 4 Pages

Ever since the industrial revolution commenced, around one third of the carbon dioxide released by human interference has been absorbed by the ocean, which is one of the reasons of the drastic change in climate as well. Without the ocean absorbing carbon dioxide, the carbon dioxide n the atmosphere would be drastically higher, with possibly increasing the levels of climate change. The point of the research is to see how will the pH affect the organisms in the marine ecosystem and does carbonation affect an organism’s mass and form. Many organisms that are part of the marine food chain are going to be affected by ocean acidification due the levels of acidity deteriorating the calcium carbonate within the animal. It turns out

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Aquatic littering can be further categorized into two main sources, namely, land-based sources and marine-based sources. Land-based sources that pollute the marine environment include local drainage systems, fleeting streams and sewage drainage. Industrial, agricultural and domestic activities also play a vital role in causing marine pollution.

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LITERATURE REVIEW What is water pollution? As the country is becoming more and more populated, the demands for social services have increased significantly. This has led to an increase of the pollution in many developing towns such as Ga-kgapane. The most disturbing and problematic forms of pollution in Ga-kgapane is the pollution of the natural streams. Water pollution is when there is a build of one or more substances in water to such an extent that it causes problems for animals or plants.

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