Andrew Derocher, biologist at the University of Alberta, and the rest of his team have come up with a few ways to combat these needs. One of the main reasons polar bears are going extinct is because they aren’t getting the right amount of food they need to survive. Seals, the main food source for the polar bears, are animals that depend largely on the algae that grows on the ice of the Arctic. With the ice content slowly depleting, there isn’t enough seals to sustain the polar bear population. One of the
Chris McCandless was considered out of the normality because he wanted to travel to Alaska by hitchhiking, and live in the wilderness (Krakauer 32). Timothy Treadwell was considered out of the normality because he wanted to go live with the bears in the Alaskan wilderness believing he was going to help them (“The Bear Man”). When Chris McCandless and Timothy Treadwell died it was in a coincidental way. Chris McCandless had donated $24,000 dollars to OXFAM a charity to stop hunger and in the end he died from hunger (Krakauer 72). Timothy Treadwell went to go help the bears and in the end he died from a bear attack (“The Bear
Worldwide, there are over 50 million animals raised in these fur farms every year. This doesn’t include the number of rabbits skinned alive, which adds up to approximately a 120 million animals slaughtered for the sole purpose of fur production yearly. c. Who is Affected: According to the Washington State Department of Ecology, waste from fur farms is poisoning our waterways due to the huge amount of ammonia released into the atmosphere. Also, producing a fur coat takes 15 times more energy than does producing a faux-fur coat or any other clothing
Sadly, many Americans believe that losing the wolves would not be a bad thing for the prey’s sake, but in all reality losing the wolves would be devastating. One major thing that is present in all ecosystems, the place in which animals live, is a trophic cascade. A trophic cascade is explained in the essay as a “sequence of impacts down the food chain” (578). Hannibal gives the reader this example: “…In Wyoming’s Yellowstone National Park … wolves were virtually wiped out in the 1920’s and reintroduced in the ‘90s. Since the wolves have come back, scientists have noted an unexpected improvement in many of the park’s degraded stream areas”
The first to occur is a drastic change in climate in the 1300's, with temperatures so low that the icebergs that formed made it undesirable to travel to Greenland by sea. The second event was the Black Plague pandemic that erupted in the mid-1300's (Diamond, 267). This caused the population to be cut in half, which even further lowered the number of ships going to and from Norway. The third event were the Christian Crusades in Europe in the 1400's that allowed elephant ivory to come into Europe, which took priority over the walrus ivory that the Greenlanders had to offer (Brown
“Density dependent factors? Well the extensive whaling, especially after World War 2, may have decreased their size. The males that I’ve seen usually don’t exceed 18.3 metres in length and 51,000 kg.” She also wrote down risk of extinction, disease and competition for food under that category. “What’s next?” she asked herself. “Density independent factors?
Why would someone want to hunt and kill such an ethereal creature? Figure 1. Snow Leopard Click and drag to move The number of snow leopards that are still left is estimated to be around 3,500 to 7,000 ("Basic Facts About Snow Leopards," h.d.). There are only 600 to 700 snow leopards that are being kept in zoos. However, there is not an exact number that states how many snow leopards are still in the wild since they are rather shy creatures that live in isolation (“Basic Facts About Snow Leopards,” h.d.).
Trophy hunting has potential to have significant negative impacts on those animals that have drastically dwindling populations. According to the International Fund for Animal Welfare, “the latest surveys estimate that there are fewer than 40,000 wild lions in Africa today, a century ago there were 200,000 lions” (International Fund for Animal Welfare). The Smithsonian also weights in on the issue and reports, “loss of habitat and decline of prey species are huge factors which, in turn, mean increased lion conflicts with livestock herders—and, often, dead lions; and as numbers drop, the gene pool is dwindling, causing inbreeding and weakened immune systems” (Bland). What may or may not come as the biggest surprise is that wealthy American citizens have contributed significantly to such declines. The International Fund also claims at “least 5,663 lions were traded internationally for trophy hunting purposes.
Without wolves, elk and deer populations rise too high and they over consume vegetation. This increases erosion on riverbanks, increasing turbidity in river waters and decreasing overall productivity. Also, in the winter months, elk and other large omnivores are not feeding regularly enough, and usually die of starvation or disease and other creatures, wasting fuel for food web, do not consume their remains quickly enough. The introduction of wolves is essential to bringing back the ecosystem to a healthy flow. Wolves eating habits are much more irregular than other primary predators, in that they can only consume about 20 pounds of meat before having to lie down.
For example, the Gentoo penguins which may be found in the South Orkney Islands of Antarctica seem better adapted to free ice condition than its closest relative which is the Adelie and Chinstrap penguins. These two other classes of penguins which may also be found in the Orkney Islands have declined dramatically in the past 26 years since climate has been warming (Forcada and Trathan 2006). If these trends continue to occur at the same rate at which they are happening, soon there will be no more ice sheets for penguins to live in and some repercussions for penguins will be food supply shortages and competition for resources will be more vigorously competed for. An example of new competition that may arise from ice sheets decline can be seen through the Gentoo penguin and the Adelie penguin. Since the Gentoo penguin is moving southward to where the Adelie penguins live this
Polar bear endangerment The article “Melting Ice Threatens Polar Bears ' Survival” by Katie Madan is about the melting icebergs and how it is threatening the polar bears survival. The department of interiors are making a decision on putting the polar bears on the endangered species list, a study shows the Polar bears in beau fort sea region in Alaska and Canada are going to go extinct soon. The bears need there ice as a platform to hunt for their food such as seals or fish, if they cant hunt for food then they will die of starvation thus making them extinct. The population of the polar bears having been decreasing by 25 percent per year. Katie’s purpose for this article was to show people what is happening to these polar bears because of global
According to the explanation, the author proposes that it is the melting of sea ice caused by global warming that results in the decline of the number of Arctic deer. However, unless she offers further additional evidence to strengthen her argument, the conclusion can remain, at best, unwarranted. To begin with, although some local hunters report that the deer population seems to be decreasing, it doesn’t necessarily mean that deer are really less than before. Clearly, the author assumes that the report by hunters is reliable. However, it is highly possible that hunters don’t tell the truth.
The arctic tundra biome is a biome located in the arctic circle, in such places as north Canada, Russia, Alaska, Iceland, Finland, and most of Greenland. Covering approximately 20% of the Earth 's land surface, the arctic tundra biome is the coldest biome on Earth, with winter temperatures averaging at -34°C (-30°F), and summer temperatures of around 3-12°C (37-54°F). The moderate summer temperature allows this icy biome to sustain life. Yearly precipitation is a low 15-25 centimetres (6-10 inches). The ground in a tundra biome has very low nutrients,which accounts for the low amount of plant life.