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. …show more content…
The professor counters this point by saying that the whales were disappeared because of the human hunters. That made the Ocras change their diets to hunt seals, sea lions, and sea otters, so that supports the predation theory also. Third, the reading states that the pollution hypothesis could also explain the uneven pattern of otter decline. The professor refutes this point by saying that ocras ' populations declined in the places, where the Ocras are easily accessible to the sea otters, while sea otters ' population did not decline in the shallow water or rocky areas, where it 's hard for the Ocra to get
of food per day for some large male otters. Their diet being mainly sea urchins, the sea otters keep the urchin population under control which allows for other life within the kelp ecosystem to survive and create a balanced ecosystem. Without the sea otters in a kelp ecosystem, the sea urchins can take over and disrupt the ecosystem by killing out some algae species and some fish which live in the
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
This also shows how hunting doesn’t just cause extinction, but also makes an area less protective. The protaganists made sure that people such as Drake McBride and Jimmy Lee Bayless should always be avoided in the wilderness. Even though some of the animals are dangerous, they taught us that anyone should have some type of shelter no matter what the cause
Today otters face other threats. Apart from disease epidemics, otters continue to be threatened by overharvest, interactions with fisheries (e.g. gear entanglements), oil spills and being prey to killer
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.
At the bottom of Naple Island Gazette’s front page, I saw the headline: Manatee Habitat Threatened by Local Development. The article explained that a new housing development was planned for an area along the Okee River. Many of the properties would have docks in the river so owners could park their boats and have easy access out into the bay. I knew that the Okee River was the best place locally to spot manatees. They loved floating in the warm water and munching the thick sea grasses that cover the river bottom.
River otters have beautiful coats and thus they have been hunted by many people. They mainly eat fish, but they eat many other easily accessible things, like shellfish, crustaceans, mollusks, oysters, birds, rodents, and frogs. Their population is hard to tally, but has been estimated to be over 100,000 based on harvest reports. River otters may be found in all states and territories of the U.S. and Canada. They will only settle into an area amidst concealing structures, generally consisting of foliage or rock piles.
The majority of people wanted to exterminate Gray Wolves because they were very frightened of them, and because the wolves ate farmer’s domestic livestock. The desire to exterminate was strong until interest in environmental conservation took place in the 1960s and 1970s. As study into environmental conservation developed, scientists discovered without wolves present in Yellowstone to hunt and kill prey, the elk started to overpopulate. Overpopulation was a problem because the elk were eating all the young willow trees. Overconsumption of willow trees affected the habitat of many other animals and plants in harmful ways; therefore, the ecosystem became unbalanced.
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
Estes, J. A., 1990. Growth and Equilibrium in Sea Otter Populations. Journal of Animal Ecology, 59(2), pp. 385-401. Kenyon, K. W., 1969. The Sea Otter in the Eastern Pacific Ocean.
I. How has the general view of whales and whaling changed in America? Why do you think the general view on whales and other creatures has shifted so drastically? Do you think there is a double-standard for some animal hunting? Why or why not? II.
Attention Getter - How many of you have heard of the documentary, Blackfish? This documentary released in 2013 “focuses on Tilikum, an orca whale held by SeaWorld, and the controversy over captive whales”, according to wikipedia.org/blackfish. It goes behind the scenes of the glorified water shows to expose the truth on how these whales are treated. According to www.care2.com, “SeaWorld stated it spends 70$ million on its orca facilities every year, but a tank is still a tank and no amount of money can turn a tank into an ocean.” Reason to Listen - Imagine being put up for display like the orca whales showcased in this recently publicized documentary.
2. Brief analysis/warrant (How/Why this is important?)This shows how if we continue to pollute our atmosphere by emitting greenhouse gases such as carbon into our atmosphere, it will cause more natural disasters which will be more severe due to the rising temperatures which will allow for more severe storms, which is all a result from emissions. II. Conclusion A. Restate Thesis to remind the audience of your position: It can be said from the previous examples that global warming and climate change are both caused by human emission of greenhouse gases which result in consequences such as warmer temperatures and severe natural disasters.
Statement of Problem I. What are the causes of global warming? II. How is it affecting our environment? III. How can we minimize the activities responsible for global warming?