Varying Temperature Lab Report

​The data shows that when the temperature of the water surrounding the deep well slide containing the Daphnia magna increased, the heart rate of the Daphnia magna increased, and when the temperature of the water decreased, the heat rate of the Daphnia magna decreased as well. For example, when the water was at room temperature, 21° C, the average heart rate was 393.33 BPM. When the water temperature was increased to 30°C, the average heart rate increased to 510.66 BPM. When the water temperature was decreased to 10° C, the average heart rate in beats per minute decreased to 332 BPM, less than both the 21° C and 30° C results. The warmer the water temperature was, the higher the heart rate of the Daphnia magna.

Ectothermic animals are animals whose body temperature is affected by their surroundings. This means that if the environment is cold the animal will be cold. If the environment is warm the animal will be warm. This is because the animal doesn’t have the capability of regulating its body systems to keep a constant body temperature. When an ectothermic animal is cold, its heart rate will lower. When the animal is warmer, the heart rate will raise – as long as the temperature isn’t sufficiently high to harm the animal. (Campbell, 2005)

To measure baseline heart rate, single Daphnia magna was placed into a well of a concave slide and excess water removed using a tissue. A coverslip was not used as it would injure the specimen. The water was enough for gills to function normally with the specimen immobilized.

At the conclusion of the experiment, the two hypotheses were reviewed. Because the water temperature did affect the normal respiration patterns of the goldfish, the null hypothesis was disregarded and the alternative hypothesis was accepted. From the results of this experiment, it was concluded that although other environmental factors could play

13. Which of the following is not an expected response in a fish to a drop in water temperature?

Freeman (2008) furthers Eckert et al’s argument by stating that the actin filaments of the muscle cell in organisms are able to intake ATP (adenosine triphosphate) faster and will move the organism faster when higher temperatures are imposed. This is because of an increase in enzyme reaction rates (Freeman 2008). These arguments can be applied to our experiment to help explain the trends observed. It can be argued that as the Gammarus setosus experiences the cold treatments, the organ of Bellonci senses the cold temperature, which in turn signals the organism to preserve its energy to protect itself; therefore, the organism will swim slower. In addition, the enzymes in the muscle cells of the organism, when experiencing the cold treatments, will have decreased ability to carry out enzymatic reactions, therefore inhibiting the uptake of ATP, which will cause the organism to swim slowly. Conversely, as the organisms are put into the heated treatments, the organ of Bellonci senses the heat, and allows the organism to swim faster, since it does not have allocate as much of its energy towards survival. Furthermore, the enzymes in the cells will be able to catalyze reactions more quickly, therefore allowing the organism to swim faster. However, when the temperature of the surroundings is too high, the enzymes will denature, therefore, reducing the activity rate of

The actual word homeostasis means "steady state". Homeostasis describes how the body regulates its process to keep its internal conditions as stable as possible. Homeostasis is

direct calorimetry. Furthermore, the amount of oxygen in the chamber reveals the amount of cellular respiration of the organism. While also, test the effects of decreasing oxygen, and later increasing the heat on the metabolic rate of goldfish. I hypothesize that an increase in temperature will increase their metabolic rate

It is usually a challenge to choose between the devil and the deep blue sea. Ordinarily, one has to consider one’s values as well as preferred consequences in order to make the better or best choice. In the short story, “What of This Goldfish, Would You Wish?” by Etgar Keret, Sergei Goralick faced a similar conundrum. As an aloof Russian expatriate fisherman in Jaffa, Israel, his only company is a magic three wish-granting fish. But having impulsively murdered Yonatan, Goralick had to decide whether to use his last wish to save the boy or keep his magic goldfish companion. Though he would have preferred the latter, Goralick made the better choice saving Yonatan as it matches his established humaneness and the consequences attached were more reasonable.

The procedure for this experiment followed the steps as shown in the flow chart (Figure 1) and will be expanded upon here. The oxygen-measuring probe in the test chamber was first turned on and required 10 minutes to warm up. During this time, two empty containers had 200mL of fish water added to them and then each was weighed using a scale that was tared to zero before use. Two pairs of goldfish were then collected from the large tank #1 in the lab room using the fish net provided, and one pair was placed in each container. Then, the containers were reweighed separately and the original weights were subtracted from the new weights in order to determine each pair of goldfish’s weight. Two trials were conducted and in each trial, each goldfish pair was subjected to two conditions, first a control condition where no factors were introduced, followed by an experimental condition where they were exposed

Therefore this experiment was to determine that lobsters in various salinities will osmoconform to their environment. In order to test that lobster's osmoconform, we had to extract approximately 1.0 ml hemolymph from their hemocyannin on the ventral first section of the pre-branchial region. The hemolymph was spun for three minutes in a microcentrifuge and the serum was then tested on an osmometer, which determined the osmolarity of the hemolymph. The results substantiated the hypothesis, in that, lobsters internal osmoles fluctuate with the salinity of the external environment. The two lobsters in the low salinity tank had the lowest osmolarity 0.746 osmoles; the two lobsters in the normal salinity had 0.873 osmoles. The last tank with the highest salinity had the lobsters with the highest osmolarity at 1.445 osmoles. Therefore our data suggests that lobster's osmoconform, with respect to the salinity of their environment by readjusting their intracellular solute concentration to prevent swelling or dehydration because the osmolarity of their hemolymph dictates that of the environment.

The experiment goal was to measure the effects that different water temperatures had on the Daphnia's heart rate and the effects of epinephrine as well. Daphnia is commonly known as water flea bugs that are small aquatic crustaceans that is found plentifully in small bodies of fresh water (General Biology Study Guide and Lab Manual, 10th ed. 2007). These water bugs are good animals to use for this type of experiments because they are large enough to be seen without a microscope in light and under the microscope at twenty times magnification their internal organs can be seen straight through their body cavity. Daphnia are ectothermic creatures, meaning

When compared to a similar study, a similar conclusion was made. In a study conducted by Gerristen, he studied if Daphnia would experience a positive or a negative thermotactic reaction when exposed to a variety of different temperatures. Once the experiment was completed, Gerristen was able to conclude that the Daphnia did indeed experience a negative thermotactic reaction and swam away from the cold stimuli. He claimed that these results were due to the Daphnia’s natural instinct to seek warmer water (Gerristen 1982).

Somewhat more precise descriptions can be made by using the terms poikilothermic and homoiothermic. The body temperature of poikllotherms is relatively variable, while that of homeotherms is relatively constant.

Description of Experiment:In this experiment to test the effect of colder temperatures on goldfish respiration rate.We started with a beaker