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Positive and negative consequences of migration
Positive and negative consequences of migration
Causes of migration
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The reading asserts that humpback whales migrate long distances by navigating by the stars according to three reasons; however, the lecturer finds all these reasons dubious and refute them all. Firstly, the author points out that the whales' brain has a high degree of complexity and their intelligence will provide the ability to navigate by stars. Conversely, the professor mentions that there is no specific relationship between intelligence and navigation. He also brings up an example of a kind of bird ,duck, which is not so much intelligent but born with this ability as an intrinsic feature. Secondly, the reading passage clarifies that these whales migrate in straight lines and since they swim in the open ocean, they can not rely on land features
spend an unusual amount of time at the surface. It also states that the whales also
Scientists had some idea to the evolutionary process of whales. “It has always been clear that aquatic cetaceans must have evolved from terrestrial mammals and returned to the water, and the forelimbs of recent cetaceans still have the same general pattern as that of land mammals.” (Walking with Whales) It was known fact that land mammals and whales were related. However, the change from ancient whales to modern whales is drastic.
“… building a tank the size of Rhode Island wouldn’t be large enough for a six-ton male killer whale such as Tilikum, an animal capable of swimming 100 miles a day,” states an anonymous whale expert. Whales have been in captivity since 1861 when P.T. Barnum displayed the first live whale that was captured in Canada. However, Barnum had no idea how to care for the mammal and it died after only a week in captivity. (Animal Legal and Historical Center, 2014) Being up close with killer whales could give us some clues about how they interact with each other, including physical behavior, their dialect, and how their pods work together as a family unit. However, what we are finding is that whales who belong in the wild are suffering in captivity. Killer whales have no record of ever harming a human being in the wild. In captivity, there have been many incidents of killer whales harming or even killing their trainers. What would cause them to do this in captivity, but not in the wild? They have been known to resort to aggression toward themselves and each other, in what scientist believe to be a stress induced behavior. (Animal Legal and Historical Center, 2014) Evidence against having these wild animals in captivity is increasing and we need reevaluate the value of capturing and holding killer whales for our educational purposes, enjoyment, and profit.
It's impossible to teach someone the significance or the act of loving the stars and the ocean but that's what makes navigation without instruments (wayfinding) so beautiful. One can "give the heavens a meaning his own meaning" says Nainoa Thompson. Anyone can learn the aspects of navigation through personal observation and the study of charts and maps. Thus creative thinking and logic are two important skills in learning the ancient art of wayfinding.
To fight is to stand up for what is right, break through the walls of what is acceptable, and to have the fire blazing in the eyes of a warrior. Throughout life society has taught humanity to form into a definite way that should not ever change, but through life there has been a small population who are immune from societies spell. The outcasts that must battle to stand up for what they believe is right. In the novels Antigone, Anthem, and in the movie Whale Rider, the main characters fight for what they believe is right by standing up to society's norms the society has deemed acceptable.
In Chapter 69, the narrator vividly describes the image of a recently captured, decapitated sperm whale bleakly floating about near the Pequod while sharks and birds feast upon its dead remains. Despite the degrading imagery of, “the air above vexed with rapacious flights of screaming fowls, whose beaks are like so many insulting poniards in the whale,” the whale has still, “not perceptibly lost anything in bulk...it is still colossal,” (257). In the spite of its crude carcass, there is still human wonderment in regards to the indisputable massivity of the whale. However, the whale is not considered to be enormous just because of its literal size, but also because of the long-lasting effect its dead body will have on future ship encounters. It is the duty of a ship captain to avoid steering a ship into dangerous territory--the most common of which would be large rocks near the shore. In the lines, “...the whale’s unharming corpse, with trembling fingers is set down in the log-- shoals, rocks, and breakers hereabouts: beware!”, (257), the sperm whale’s carcass is often mistaken for rocks and, so, it necessarily follows that, “for years afterwards, perhaps, ships shun the place; leaping over it as silly sheep leap over a vacuum…” (257). The paragraph continues with the lines, “there’s your law of precedents; there’s your utility of traditions; there’s the story of your obstinate survival of old beliefs never bottomed on the earth…” (257), which reinforce the idea that since the sperm whale is already seen as being frightening and mysterious, its dead body ensues the same kinds of paranoid, uneasy thoughts. So, although
An English naturalist Charles Darwin (1802-1882) developed a theory of biological evolution. He studied variation in plants and animals during his five years’ voyage around the world in the 19th century. Darwin studied hundreds of species, which he researches variations between locations. His theory states that all species of organism arise and develop through natural selection. Natural selection is the process of organisms that adapt to their surrounding environment, which tend to survive and produce more offspring. Killer whales are remarked to have evolutionary links from land dwelling organisms, millions of years ago. This paper will display the evolution and natural selection of the killer whale.
On November 20, 1820 the crew of the Essex spotted an unusual sight, an extremely large bull. The men estimated it to be about eighty-five feet long and weigh approximately eighty tons. However it was not only the large sight of the whale that alarmed the men, but it was its strange behavior. “Instead of fleeing in panic, it was floating quietly on the surface of the water, puffin occasionally through its blowhole, as if it were watching them. After spouting two or three times, the whale dove then surfaced about 35 yards from the ship (81).” After diving the whale began to do the unspeakable it began to charge the Essex, “Its twenty foot-wide tail pumped up and down slowly at first, with a slight side to side waggle, it picked up speed until the water crested around its massive barrel shaped head. It was aimed at the Essex’s port side (81).” Upon noticing that the whale was going to ram into the ship the captain gave the order to “pull the helm hard up” to prevent a direct hit however the order was given to late the whale it the shi...
The reading states that several arguments support the migration hypothesis of Edmontosaurus. However, the professor stated that the arguments in the reading passage about the edmontosaur migration are not convincing.
While whaling isn’t nearly as popular today, in this time many men made, or attempted to make, a living in this industry. Despite the hard work, dangerous standards and general intimidation, shipmates were lured into the industry for the high pay. When feeling protected by a large ship, weapons and a fearless captain, it was easy to forget the power of what they were hunting. The sperm whale is the largest of all the toothed whales, with males maturing at an average size of fifty- two feet and sometimes can reach up to sixty-seven feet in length. “It’s twenty-foot-wide tail pumped up and down.” (Philbrick, 2000, 82) The domain of life that the sperm whale belongs to is the Eukaryote. This is because the sperm whale is an organism that is made up of cells that contain a nucleus as well as other structures that are enclosed by the cell membrane. The kingdom that it belongs to is the Animalia. This is because they are multi-cellular organisms. These animals contain other distinct features including; “interior digestion of f...
...ould estimate where they spent most of their time. By the length of the other skeletal bones, the size and shape of the animals could be determined, which also shared insight to its behavior. The largest primitive whales could indeed walk on land, but only did so for short periods because their legs could not take so much weight for long amounts of time. These behaviors allow scientists and paleontologists to understand even more as to how these fascinating and mysterious animals went from ruling on land to taking over the sea.
Before affiliating the crew aboard the ship with Moby Dick, there are some comparisons to be made between them and ocean inhabitants in general. While living in the ocean environment the men begin to acquire the same survival techniques as some of the organisms in the ocean. The manner in which the whalers go about slaughtering the whales is much like the way that the sharks react to the whale carcass being held stagnate in the water. "....because such incalculable hosts of sharks gather round the moored carcass, that were he left so for six hours, say, on a stretch, little more that the skeleton would be visible by mornong"(Melville 328). These sharks are savages in the face of sustenance. In most cases the sheer size of the whale prohibits it from being captured and consumed by the sharks. The only chance that they have at these huge beasts is when they are slung along side the whaling ships. Once they have their opening to this plethora of meat it becomes a barbaric feeding frenzy. These actions of the sharks reflect the actions of the whalers when taking part in the slaying of a whale. "Soon ranging up by his flank, Stubb, firmly planting his knee in the clumsy cleat, darted dart after dart into the flying gish.
The Humpback Whale, Megaptera novaeangliae, is part of the marine mammals group. They are found in oceans all over the world, they live in open waters. Even though they are mammals, they do not live on land (Monterey Bay Aquarium). Humpback whales are known for their magical song that can travel great distances. These gentle giants are omnivores, their main diet is krill. They are mostly found near coastlines feeding on tiny shrimp-like krill, plankton and small fish. Humpbacks migrate annually from summer feeding grounds near the poles to warmer winter breeding water closer to the Equator. Humpback whales are powerful swimmers, and they use their massive tail fin, called a fluke to propel themselves through or even out of the water! Mothers and their young swim close together, often touching one another with their flippers with what appears to be gestures of affection. Even though it takes more than one year for a humpback whale to grow fully, mother whales leave them after one year (National Geographic).
Did you know in the world there are more than 90 species of whales, dolphins, and porpoises? (WDC) The dolphin is a very important animal to the ocean and there are many different types to discover. In order to learn about dolphins, it is important to discuss where they live, their appearance, and what they eat. Some helpful words to understand are “dorsal fin”, a dorsal fin is the top pointed fin on the dolphins back, “flippers”, a flipper is a flat fin that dolphins use to swim, and “echolocation” is a tool dolphins use to find food by sounds bouncing off of objects (dictionary.com).