The Humpback Whale (Megaptera novaeangliae) is one of the largest of the Cetaceans. They are fairly well known, even outside of the scientific community. They are identifiable by their dark grey dorsal color, white underbellies, very long pectoral flippers and by their habits of breaching and raising their tales above the water before diving. Their range expands tropical, temperate, and sub polar waters all around the world. They migrate in search of breading grounds and feeding grounds. Humpbacks are baleen whales that use bristles to filter their food out of mouth fuels of seawater. Their diet consists mainly of plankton and krill, as well as small schooling fish. Whales, include the largest animals in all of life on Earth, and are a curtail part of the ecosystem today. They have high metabolic demands and when they were in larger populations, before industrial whaling, whales would have had a strong influence on marine ecosystems, even greater than today. They play several environmental roles including, consumers of several species, prey to large bodied predators, reservoirs of nutrients, and detrital sources of energy and habitat in the deep sea. …show more content…
However, lack of information on past populations makes it difficult to compare the current recovery in this species, to that of pre-exploitation abundance. Estimates based on genetic diversity suggest they are still only a fraction of their pre-whaling numbers. The purpose of this paper is to examine the humpback whale’s role in the oceans, their populations, and the need for it’s conservation and the manor in which to do
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THE GREAT LAKES The great lakes are comprised of 5 different fresh water lakes, Superior, Huron, Michigan, Ontario, and Erie. The lakes are situated along the US-Canadian border, touching Ontario in Canada and Michigan, Minnesota, Wisconsin, Illinois, Ohio Pennsylvania, Indiana and New York in the United States. Roughly 34 million people in Canada and the United States live in the great lakes basin, and also 35 000 plants and animals, over 170 of those being fish, inhabit the great lakes (Zimmermann). This significantly large water body holds an estimate of 6 quadrillion gallons of water.
The invertebrates that form the gray whales primary prey are restricted to shallow water environments, but global sea-level changes during the Pleistocene eliminated or reduced this critical habitat multiple times. Because the fossil record of gray whales is coincident with the onset of Northern Hemisphere glaciation, gray whales survived these massive changes by adapting their feeding habits. When continental glaciers locked up vast quantities of the earth 's water, ocean levels dropped up to 400 feet. This transformed what is now the sea bottom into wind-scoured steppes. At the height of the ice age, most of the modern gray whale food source would have been high and dry, and yet, the whales survived.
Director, writer, and producer, Gabriella Cowperthwaite, in her documentary, Blackfish, describes the shameless hunting and treatment of killer whales. Cowperthwaite’s purpose is to persuade us into opening our eyes to the reality of what we are doing to killer whales by confining them in captivity. She invents an emotionally wrenching tone in order to transmit to the adult viewers that living in captivity may not be acceptable life for the whales. The film effectively showed that the whales should not be kept in captivity by giving the audience examples of their signs of aggression and displays of emotion. Cowperthwaite begins her documentary by showing how killer whales can become barbaric when held captive.
Stuck in a cement container that’s only eight meters wide for 14 long hours a day, practically motionless. That’s how his circus life began. Tilkilim, also known as Tili, was torn from his mother at the age of only two (A Killer Whale Gone Very Bad). He would spend 14 long hours in an eight-meter-wide enclosure with two park female killer whales, who viciously bullied him (A Killer Whale Gone Very Bad). Now today, he spends most of his time alone, drifting lifelessly in a pool at Orlando’s Seaworld (A Killer Whale Gone Very Bad).
I think that underwater noise does not affect whales. The U.S. Navy has used sonar for about 50 years. Since they started, the Navy has not seen any difference in the way whales live. In the article "What Underwater Noise?" the author states "but they did not change their overall behavior. "
Tilikum is well known for killing his trainer at SeaWorld Orlando in 2010. When Tilikum died, SeaWorld said it was ‘deeply saddened’ by the killer whale’s death, saying Tilikum had suffered serious health issues but did not give any cause of death. Tilikum was estimated to be 36 years old, and assumed to be born in the waters off from Iceland. The famous orca was featured in the documentary Blackfish, which criticized animal parks that keep killer whales in captivity. Tilikum’s trainer Dawn Brancheau died after Tilikum dragged her underwater by her hair and repeatedly struck her, whilst she was performing with him in the water.
Although the orca can be found in both in the open ocean and in the coastal waters, they primarily inhabit the continental shelf’s in the water less than 200 meters deep. In the cold water area is the most distribution limited by the seasonal pack ice. The killer whale is the top carnivore consumer on the food web. Killer whales may be large in size and appetite, but they still act on instinct and have no desire to kill intentionally. The killer whale is also a very playful and intelligent creature like most dolphins are, therefore they do not deserve the name killer whale.
I think that SeaWorld is an amazing facility. I love the fact that they rescue sea creatures from their inevitable death. I love the fact that children love to come here. I love the fact that this place causes children to subconsciously learn something. I love to bring my kids here on the weekend to watch the shows that the trainers put on with the orcas.
This graph shows a more stable recording in the movement of this type of orca; the furthest that the whale in graph B dives is about 75 meters. Resident killer whales are also known to only prefer fish, opposed to the transient killer whale, which targets marine mammals. The graph also supports the fact that resident killer whales are exactly what their name says, they are familiar with the territory they inhabit, which allows them to frequent and move about more, where as with the transient orca, they could only go so far because they navigate and dive according to where their food is. Both graphs are very distinct in terms of figuring out which type of killer whale it depicts; the resident killer whale has a very consistent dive and depth pattern, and is very easy to detect because of the obvious background of its kind—what it preys on as well as where it usually migrates to, where as the transient killer whale has a more spaced out graph, due to the fact that unlike the resident killer whale, it stays more to the coastal areas and would only dive deep to seek out other marine mammals to prey
Hannah Ton Mrs. Braun Honors American Literature 1 November 2015 SeaWorld Orca Breeding Should Not Be Continued When Dr. Heather Rally, a veterinarian who specializes with marine mammals, visited SeaWorld, she witnessed an orca with a severely collapsed fin and asked an “educational” guide why its fin was bent. The guide replied that it was a genetic trait just like curly or straight hair. However, Rally knows the truth, scientific evidence suggests that the high rate of dorsal fin collapse in captive orcas is due to conditions of captivity. These include spending an abnormally long time at the surface in direct sunlight and continuously swimming in tight circles.
(Blackfish). Killer whales in the wild are aggressive towards each other just as they are to humans, in 1989 an accident involving two whales: Kandu and Corky resulted in Kandu bleeding to death. (Kirby 2) this would have never happened if the whales had the enough space they needed to separate from each other. Contrastingly, killer whales in the wild are more peaceful toward each other and humans. There is only one accident of an orca biting someone in the wild.
Scientists have learned very little about the blue whale, but one well-known fact is that they have a big and powerful body with a voice that can send a message great distances. Doyle says that “their penetrating moaning cries, their piercing moaning tongue, can be heard underwater for miles and miles” (Doyle). The blue whale is the strongest and largest creature in existence; however, it still cries from sorrow and is wounded on the inside. The whale’s situation represents the emotions of many people. They put on the image of a tough person who can handle anything, but feel the deepest pain internally.