The author states that the pollution hypothesis seemed the most likely cause of otters decline along the Alaskan coast and provides three reasons. In contrast, the professor states that the ongiong investigation show that the predation theory is mst likely the cause of the decline and sh.e opposes each of the author 's reasons First, the reading claims that there were known sources of pollution along the Alaskan coast. However, the professor refutes this pint by saying that the pollution theory is weakened by that no dead sea otters were washed up to the shore. She said thet if the infection is the cause of the decline, there should be a lot of killed otters washed up, so this fact is consistent with the predation theory because if the sear otters were killedby predetors, they would not wash up to the shore. …show more content…
In the other hand, the speaker contends this by explaining that whales were declined because of the human hunting , orcas changed their diet to survive and because just of the sea mammals were available, human started to hunt sea mammals and cause the decline. Third, the author asserts that scientist believed that the pollution hypothesis could also the uneven pattern of otters decline. However, the professor opposes this pint by explaining that the uneven pattern is better explained by orcas predation theory. she added that it depends on whether the location is accessible by orcas or not, so because orcas are large, they can 't access the shallow region where sea otters have not
Likewise, compared to those diets enjoyed by groups in northern California and the Pacific Northwest as far back as 4000 B.C., which were rich with nutritious stock like fish and shellfish, the game-hunting in the east was less reliable. While at first the big animals of the continent were bountiful to the newfound populations they had not yet learned to fear, their numbers quickly dwindled during the “Pleistocene overkill” (Page, 36). One area whose populations did not suffer from the absence of these large mammals was the Pacific coast, an observation that is notable despite the real absence of what were likely some of the most informational sites that archaeologists could have hoped to
The author fails to make compelling arguments on the environment since he does not use sufficient academic references for his information; and misunderstands the generalization issue. McKitrick
Tradeoffs are a frequent occurrence in Nature. They describe the compromise between two optimal but frequently incompatible traits for an organism. Andrea Pomeroy and her team applied this concept of tradeoffs to the western sandpipers, Calidris mauri, of British Columbia Canada, with the trade off of their ability to forage for food against the costs of potential predation. The main idea examined by Pomeroy was to study the spatial usage (The measure of how intensely a site is used for foraging by the sandpipers) at Boundary Bay, to determine how the birds chose their stop over sites during migration based on the tradeoffs between food abundance and predation risks.
In a way they are correct however, the wolves started the growth of the ecosystem again. More birds began to come because the terrain regained strength causing trees to be healthy and stronger. The birds made habitats there causing hawks and other prey to come due to the increase of birds. Beavers began to build dens in the rivers again which also provided a home for amphibians, otters, and other animals. The circle of life began to blossom again and it all started with the wolves contribution to the ecosystem.
Kitson Jazynka’s purpose in writing Saving the sea otters is just part of her normal day at work is to recount the fact that saving underwater animals are important. Underwater sea animals are dying faster and going extinct,they need our help. Anything that can affect the otters can affect us humans as well and we can help eachother out with this fact. We think that it is important to discover the remains of the dead sea animal, because we care and want to reveal a bit more maybe even discover a new species. Lastly we need them because a species can tell us a lot of information.
The Clatsop Indians were great fish-eaters, and loved to eat sea animals. After discovering a 105 feet long whale, blubber became a tasty addition to their diet. Lewis, Clark, and I were friendly with the Mandan tribe, but didn’t like the Clatsop Indians because the Clatsop were used to traders and drove a hard bargain. We exchanged some goods, including a sea otter pelt, for fishhooks and a small bag of Shoshone tobacco. The Clatsop tribe informed us that there was a good amount of elk on the south side of the
The reading states that the pollution hypothesis seemed the more likely to cause the decline in the sea otter populations and provides three reasons of support. However, the professor states that the predation hypothesis is the most likely the cause of the sea otter decline in populations and refutes each of the others reasons. First, the reading states that the oil ridgs and other sources of industrial chemical pollution caused the death to the sea otters. The professor opposes this point by saying that the pollution theroy is weakened because people did not find dead sea otter on the beaches of the sea, and that supports the predation theory because if the sea otters were killed because of the pollution, they should wash up to the shores, and that did not happen.
In the 1900s the population decreased because of the DDT ( DDT: dichlorodiphenyltrichloroethane) sickness with the eagles. Hunters are a treat to bald eagles because they will shoot them out of the sky. If a bald eagle eats a duck that has been eating lead shots that
Sea mammals are an important species in general, so Alaskans like to keep them protected. An office named “Marine Mammals Management” was created to keep these species safe (Fishing in Alaska). One of the most important sea mammals would be the sea otter. These little creatures play a huge ecological role for the environment. Big game animals can be from a dozen of a different animals.
The reading passage argues that the sea cow extinct in 1768 and provides three possible theories for their extinction. However, the professor explains that true cause of extinction is still unknown and there are problems with the argument by the passage and he repudiates each of the author 's reasons. At first, the reading passage posits that over-hunting of native people for food in that period is the primary reason for the extinction of sea cow. In contrast, the lecturer refutes this ratiocination by imparting that sea cow was an enormous animal with 9-meter length and about 10 tons weight. A small sea cow would be sufficient for the survival of the natives for months and they did not need to hunt a lot of these animals for food.
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.
ea otters are an essential keystone species in a marine ecosystem. They help to keep down herbivore populations to keep kelp happy and they keep sea urchin populations down. Sea otters are mammals that live in oceans often around california kelp forests. They live in chilly waters but have no blubber (Picky Eaters, p.1). Instead they have a thick coating of fur.
In this set of materials, the reading passage describes three arguments supporting the migration hypothesis of Edmontosaurus; from Alaska 's North Slope to the South, while the listening passage opposes these arguments. The Author; first, explains that the edmontosaur migrated to search for food in warmer areas. In addition, these animals used to live in herds as many living animals do. This supports the idea of migration.
Grizzly bear is a kind of animal which has no predators, except for humans. Nowadays, If grizzly bear hunting should be allowed has became a controversial topic. To some extent, I agree with this point of view. In this essay, I will analyze some reasons that why I agree to stop hunting grizzly bear to a certain extent. The prohibition of hunting grizzly bear can be of assistance to the ecological balance.
Introduction Predation is a biological interaction between two organisms of different species in a community in which one acts as a predator and captures and feeds on the other, the prey. Predator-prey relationships keep animal populations in balance. When prey populations increase more food is available for predators, and they increase in number as well. An increase in predators triggers a decrease in prey populations. As prey populations decrease predator populations soon follow as their food supply diminishes.