My group recorded higher heart rate compare to the class average when we used caffeine on the Daphnia as seen in Figure 2. Several errors could have accounted for this data. This including perhaps the Daphnia’s heart rate may have changed because of fear while being moved from the bowl to the microscope slide. Another possible error could have also been the amount of time that it took to change the solutions, which could have accounted for slight variations in heart rate. Temperature is yet a further error to account for as the microscope slide temperature was constantly changing to view the specimen, and change the dosage of caffeine or alcohol. The temperature of the solutions could also have played a factor in the Daphnia Heart rate as ideal conditions for Daphnia is 68 degrees Fahrenheit and the temperature of the solutions was not measured for.
The ocean is a giant body of water that is home to all types of fish. The ocean provides a rich environment for a plethora of animals from the tiniest of fish to the enormous whale. In the ocean, these creatures live and explore. Some of them must hunt other fish in order to survive, which means that others must try to avoid predators. Nature has provided all of these animals with a unique capability to survive. The ocean abounds with interesting animals of all shapes and sizes that have their unique appearances and habitats at different depths of the sea.
Humans are expanding out into the ocean which is causing manatees to lose their habitat. Manatees live in shallow warm waters and as humans expand manatees do not have many places that they can relocate to. Manatees are like the Native Americans in the sense that they had their land taken from them. Some manatees have been relocated to zoos or other natural protected lands so they can live in the wild and not have to worry about having a food shortage or being struck by boats.
Although sloths are the slowest moving animal in the world, that's not true when it comes to swimming. Sloths can swim three times faster in the water then they can on land. They can even swim fast against the rainforest/jungles fast currents. If a sloth wants to get somewhere fast they just drop from a branch into the water and speed their way down to where ever they were headed.
The purpose of the Sheep Heart Dissection lab was to take a look at the heart's anatomy and all the parts that it consists of. This lab helped us learn how the heart is able to function, and gave us a hands on look at what a real heart looks and feels like. I worked on this lab with Jose, and Alex. We completed the procedure in one day of class, and had the questions completed by the second.
Invasive, alien species, those which colonise, expand and out compete native species (Smith & Smith, 2009), are a major threat to our habitats, terrestrial and aquatic species, and biodiversity. Agricultural and leisure industries are affected as well as conservation welfare and the continued wellbeing of man, flora and fauna. Whole ecosystems can be distorted and the economic cost of awareness, prevention and eradication systems is substantial. Most invasive species have been introduced by mandeliberately or otherwise. As an island, Ireland has been subjected to less invasive species than larger nearby land masses e.g. Europe, but islands have a less diverse species population and are therefore more vulnerable when invaded. As international movements increase, risks spread. Some non-native species are not obviously detrimental on introduction, but become so in the future and intensive monitoring is required.
While fossils generally do not preserve soft tissue such as lungs, a very fine theropod dinosaur fossil has been found in which the outline of the visceral cavity has been well preserved. The evidence clearly indicates that this theropod had lung and respiratory mechanics similar to that of a crocodile—not a bird. There was evidence of a diaphragm-like muscle separating the lung from the liver, much as you see in modern crocodiles. These observations suggest that this theropod was similar to an ectothermic reptile, not an endothermic bird.
Four randomly selected Daphnia magna, for each trial, were removed from the provided colony for the bioactive compounds to be tested, and were transferred with a plastic wide-mouth pipette with approximately 10 mL of pond water to protect and ensure survival of the Daphnia. In order to acclimatize the Daphnia to laboratory conditions, they were then placed onto a petri dish on the Daphnia cooling chamber. The cooling chamber was located on the stereomicroscope platform and brought down the heart rate of the Daphnia to a range that was countable by the observer, since Daphnia heart rate at room temperature is too rapid. On the cooling chamber there were two petri dishes: one for the Daphnia that were going to be tested, and one with the Daphnia being tested on, to ensure constant consistent temperatures for each trial. To maintain a temperature conducive to the heart
Manatees first appeared in Florida about 15 million years ago. Manatees are very large marine mammals that are related to elephants. ‘’They are grayish brown in color and have thick, wrinkled skin on which there is often a growth of algae. Their front flippers help them steer, or sometimes crawl, through shallow water.’’ Even though it seems like Manatees have small eyes and no outer ear, manatees can see and hear very well.
Succession: Succession is a process where changes are made to the base of a biological community over a period of time.
The following experiment determines the effects of 50 ml tobacco extract on the heart rate of a crustaceans Daphnia Magna. Daphnia represents a small group of aquatic crustaceans, also known as “water fleas”, with clear exoskeletons, which makes studying their heart rate effortlessly. The heart rate can be observed using a microscope and counted under varying conditions. (Pritchard, J. B.) In this case, changing the type and concentration of natural plant substances reveals the effects of the plant defense mechanisms on the specimen of Daphnia Magna. Tobacco (Nicotiana tabacum) was the plant chosen for the experiment. Since, nicotine in tobacco is a stimulant, it is predicted that if Daphnia exposed to this substance would have an increased
Burns Bog is a domed bog which is approximately 3000 hectares in size and is mostly covered by peat. Under this peat, is a layer of deltaic sand which was deposited from the creation of the Fraser River over 5000 years ago (Comprehensive Guide to Burns Bog). This was when the Fraser River was a low wetland and as flooding occurred, sediments were carried and accumulated. Over the past 150 years, dykes and draining changes have impacted the vegetation (more dryer plants). This is a reason why only two-thirds of the bog remains today.
During the experiment, a scissors was used to cut the heart through the side of pulmonary artery alongside anterior interventricular artery; the cutting continued down into the wall of right ventricle.
Sustainable forest management requires three major criteria which are the maintenance of ecological processes within the forest (soil formation, energy flow, biogeochemical cycles (carbon, nutrient and hydrological cycles), maintenance of biodiversity of forest, improving the net social benefits derived from the mixture of forest uses within the constraints by considering the future. Forest provides habitats for more than half of the fauna and flora on the Earth (SCBD, 2001). Forest biome plays an important role in mitigating climate change by serving as carbon sinks (Hassan et al., 2005). Forest land is the most fundamental natural resources which become reduced mainly due to anthropogenic pressures. For proper management of land, it is essential to have information about existing land cover and about the naturalness of the land. The increment in forest cover does not mean that
In 1921 Swedish scientist, Olaf Arrhenius proposed the Species Area Relationship (SAR). This theory was created to explain and understand the relationship between a size of an area and the number species therein, as the name suggests. It was concluded from the experiment that as the area increases the number of species found within increases continuously less. If graphed we notice a curve hence the species-area curve. (Vreugdenhil, 2003)