Daphnia Lab

Words: 1230
Pages: 5
Open Document
The Environment, Daphnia, and The Intruder.

Abstract. The purpose of the experiment was to prove how pollution and runoff affected our water, food chains, as well as our ecosystem. The subjects used were daphnia magna, obtained from Carolina Research. The daphnia were placed in separate tanks and were cultured for one month, after the month and having approximately 3500 in each tank, 40 daphnia were extracted from each tank and placed in separate cups, and the experiment began. In the more basic cup, (Tank 3, “Green Jar”), at a PH of 7.8, and in the span of 30 minutes, 87.5% of the daphnia died. And in the more acidic jar (Tank 1, “Blue Jar”), at a PH of 6.8, and in the span of 30 minutes, only 45% of the culture did not survive.

I …show more content…
My hypothesis is that the effects of waste drifting in the ocean can affect the aquatic ecosystem, by changing the toxicity/PH, which then affects the land life and the top predators, and their ecosystems

II . Materials and Methods
Exactly forty daphnia in three different tanks kept in the exact same conditions were extracted and put into three different containers. One was a control jar, or the “red jar”, which was left alone. The other two were labeled the “blue jar” and the “green jar.” In the “green jar” the PH/toxicity was raised, to 7.8, with one teaspoon of vinegar. And a timer set for thirty minutes, and checked every five minutes was started.
In the “blue jar” the PH/toxicity was lowered to a 6.8, with one teaspoon of baking soda. And then the timer for thirty minutes was started, checking the clock every five minutes.

I hypothesized that the effects of waste drifting in the ocean can affect the aquatic ecosystem, by changing the toxicity/PH, which then affects the land life and the top predators, and their …show more content…
III. Results & Discussion
(See Figure One for all of these data points.)
In the “blue jar” towards the beginning, four died. At the ten minute mark there was no change in death number but they migrated to the back left corner and then they dispersed at twelve minutes. At the fifteen-minute mark they are still up against the left wall, but they are not spread out. An observation made was that by adding baking soda makes the food float and created a lot of commotion in the middle/left side of the tank. There was no change at the twenty-minute mark.

The “green jar” had contents that within the first five minutes, ½ of the daphnia were already dead. At the ten-minute mark there were none dead, but the daphnia swarmed the front right corner towards the bottom. At the twenty minute mark there was no change. At the twenty-five minute mark eight more daphnia died. Although an observation was that when you add vinegar or raise the toxicity, destroys the food and makes the daphnia very active/crazy with even more erratic, and quicker
Show More

Related Documents: Daphnia Lab

Daphnia Lab

Abstract: The Daphnia magna, also widely known as the common water flea, is a freshwater crustacean that assumes a vital environmental role and is a significant model creature for different aspects of the scientific world (Ghazy et al., 2009). The purpose of this lab was to study the response of the genus Daphnia to exposure to different salinity levels. It was hypothesized that as the salinity levels increased, the survivorship of these organisms would decrease. In order to determine this, the salinity…

Words 657 - Pages 3

Daphnia Lab Report

Discussion on the effect of alcohol on Daphnia Magan The experiment on the effect of alcohol on the heart rate of Daphnia was done in Richland college lab. The purpose was to see how 1% , 3%, and 5% of alcohol concentration affects the heart rate of the Daphnia per minute. The hypotese being tested in this investigation is, The increase of alcohol in bloodstream decreases the heart rate per minute. The prediction was that the Daphnia heart will decrease and will eventually stop when it is exposed…

Words 406 - Pages 2

Daphnia Lab Report

Daphnia (also referred to as water fleas) are small creatures that can adapt to wide ranges in acidity, toxins, oxygen concentrations, food quality and temperatures by "tuning-up" or "tuning-down." the experiment was to answer the question: “How does alcohol affect the heart rate of Daphnia?” The question:”How does alcohol affect the heart rate of Daphnia?” was answered by: Getting multiple daphnias from the pond water Placing the daphnia under a microscope and determining its heart rate per 10…

Words 167 - Pages 1

Daphnia Magna Lab Report

INVERTEBRATE RESPONSES TO STIMULI NAME : SHARAVANI SHANMUGANATHAN SANJEEVI COURSE : BIOLOGY (SBI4U) INSTRUCTOR : MS. PAULINE COLE INSTITUTION : SUNWAY COLLEGE DATE : 3 MAY 2016 Introduction A physical description about the Daphnia Magna would be that these creatures has a body, shaped like a kidney bean, approximately 2 – 5 mm in size and being transparent. The body colour that this organism reflects is basically the colour of the food consumed by it. The transparent body is covered by a shell…

Words 2161 - Pages 9

Daphnia Magna Lab Report

INTRODUCTION The purpose of the experiment is to test multiple substances on a Daphnia Magna, which is a small water flea, to see what affect the substances will have on it. Thus, conclusions can be drawn on how the substances would effect a human heart. “The substances that will be used are called chronotropic drugs which affect the heart rate. A positive chronotropic drug will increase the heart rate, while a negative chronotropic drug will decrease the heart rate”. (College, 2014) The five…

Words 876 - Pages 4

Daphnia Magna Heart Rate Lab Report

The effect of trisodium phosphate on Daphnia magna’s heart rate Abstract: Trisodium phosphate is a key regulator of body systems such as the heart. The heart rate of Daphnia magna can be influenced by many factors, since these water dwelling creatures are quite small. To find the change in heartbeat of the D. magna, we counted the heart beats of D. magna that were soaked in either water or trisodium phosphate. There was a significant difference between the heartbeat of the D. magna in the different…

Words 1782 - Pages 8

Finding The Most Efficient And Least Toxic De-Icer

Finding the Most Efficient and Least Toxic De-Icer Introduction: The purpose of this lab was to determine which was the best and least toxic de-icer. In order to find this out, experimenting had to be done. Water, along with three different de-icers were measured to figure out their boiling point. Finding the boiling point was found because its easier to find than the freezing point due to the circumstances in the classroom. These freezing point depressions and boiling point elevations are known…

Words 1317 - Pages 6

Plant Defenses (Daphnia) Experiment

Topic: Plant Defenses (Daphnia) Experiment Author’s Name Professors Name Institutional Affiliation Date Abstract The experiment was carried out to determine the effect of plant defenses on Daphnia magna which is a small herbivore. The plant defense that was used in this experiment was black and green tea. The Daphnia Magna was placed in on a microscope and the HR (heart rate) per minute was recorded. After the introduction of black and green tea to the small herbivore, the heart rate…

Words 1661 - Pages 7

Daphnia Magna Research Paper

Daphnia magna are planktonic crustaceans that belong to the subclass Phyllopoda. They can dwell in a great margin of standing freshwater with an exception for extreme habitats (Ebert, 2005). Some species may be found clinging to substrates like water plants or over sediments of shallow ponds (Ebert, 2005). Daphnia magna adults can range in size from smaller than 1mm to as great as 5mm. Daphnia have open blood circulation, and their heart is located dorsally which is anterior from the brood chamber…

Words 590 - Pages 3

Daphnia Magna Experiment

In the present study, the influence of temperature on the heartbeat rate of Daphnia magna was studied using variations of temperature. To determine whether the Daphnia species heartbeat rate is influenced by temperature, the effects of three different temperatures (±5oC, ±16oC, ±34oC) was investigated. Daphnia magna is a crustacean, that lives in aquatic environments. Predictions were based on the knowledge that physiological processes increase at higher temperatures, therefore, it was hypothesized…

Words 881 - Pages 4