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
The cause of this was a nasty toxin called microcystin. Microcystin appears because of human pollution and fertilizers that flow into rivers and lakes which then lead to the ocean. Cancer-causing chemicals called PCBs and pesticides like DDT are in marine mammals ' fatty tissues and they cause serious harm. 2. Many health departments encourage people not to swim 72 hours after it rains because the coastal waters are polluted from urban runoff, leaking sewage from sewage pipes and overflowing sewer manholes.
The lecturer and the reading passage offer two theories to explain why the sea otter population is in rapid decline. The two theories are predation theory and pollution theory. The professor argues predation is the more likely cause than pollution because of the absence of dead sea otters washing up on shores. However, the reading passage attributes the decline of the sea otters population based on evidence of increased ocean contaminates leading to greater vulnerability to infections. Also, the lecturer argues that orcas are likely factors in the population decline of the sea otters because of the scarcity of their usual prepay.
There are three main reasons why trawling should be banned. First, it is a very wasteful type of fishing because there are many other living things killed or damaged in the process of trawling. Second, it destroys many protected ecosystems. It heavily damages already suffering sea bed ecosystems, that recover at very slow rates. Finally, it kills many non-commercial fish, reducing their populations uselessly.
People complain about pollution from factories, cars, global warming, and the melting of polar ice caps, yet many people disregard the dangerous that come with fracking. Fracking is the process of injecting liquid at high pressure into subterranean rocks, and/or boreholes to force open existing fissures and extract oil or gas. Fracking is causing an epidemic economically and environmentally. Fracking is continuously destroying the earth day by day. From the endless fracking today’s economy is depleting.
Lutra Lutra also known as the ‘European Otter’ has a distinctive white color in it’s brownish coat along the side of it. The European was once endangered in 1950 but is now only considered near threatened. This is because of the ban on poaching their pelts. 5. Japan’s Ministry of the Environment officially declared Lutra Lutra Whiteleyi or better known as the ‘Japanese River Otter’ extinct in the wild.
As a result, the food chain is disrupted because the producers at the bottom of the food chain cannot produce because sunlight is blocked, leading the primary consumers without a source of food. This may even lead to primary consumers to eat plastic. Also, research shows that fish cannot detect these dead zones so once they enter them they most likely will not get out. In addition to this, contaminated fish and marine life humans consume can contribute to diseases and problems within the human body. Exposition to chemicals such as chemicals in plastic bottles and pesticides can cause hormonal problems, reproductive problems, nervous system damage and kidney damage.
The sources of information used in this essay are books, the internet, documentaries and previously obtained knowledge, and these were used to support and provide evidence for my hypothesis; that humans are almost the sole reason for the decline in the population of sharks, and that killing sharks at the current rate will lead to undesired long-term effects for humans. The argument this essay supports is that humans have had a major, mostly negative impact on the population of sharks in recent years. The research supports the idea that the current disruptions to the lives of sharks does not benefit humans to a degree which is ethically justifiable, and that the long term effects of killing sharks would be severe, causing disruptions in the food chain and damaging the seafood industry in numerous
Conclusion To conclude, littering is a serious global problem, littering is caused by people because they are lazy, lack environmental knowledge or because there aren’t enough waste bags around. Littereing can affect many ecosystems and creatures and can emit greenhouse gases therefore causing global warming. In order to stop littering, people can use reusable bags when shopping. Bibliography Anon., 2005. Effects of Marine Litter.
The definition of over fishing is to deplete the number of fish in a body of water by too much fishing. Overfishing is very harmful to the ecosystem, taking a species close to extinction or completely extinct. As a species gets close to extinction it can be very hard to restore them back to sustainability. Even closing the fishing game for that species is not enough for a species to comeback from overfishing. Both recreational and commercial fishing have a huge impact on overfishing, by keeping under sized fish and other aquatic life.
Another natural cause is oceans and hurricanes. Both the ocean waves and hurricanes accelerate erosion, which is a main cause to the marshes disappearing. Something New Yorkers should realize is that "80% of oil and natural gases produced in the U.S. travels through our marshes" as according to page 12. America 's economy could go so wrong if the marshes the oil processes through suddenly disappears. Also, a huge percentage of marine life loves in Louisiana 's marshes.