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esssay on polar bears and global warming
esssay on polar bears and global warming
polar bears climate change effects
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What is the first marine mammal added to the endangered species list attributed primarily to climate change? As climate change melts the ice, it is projected that two thirds of polar bears will disappear by 2050. This drastic decline in the polar bear is occurring in our lifetime, which is but a miniscule fraction of the time polar bears have explored the vast Arctic seas (National Wildlife Federation, 2014).
Unfortunately, that is the polar bear (Defenders of Wildlife, 2013). The climate change endangers the species, so much so that the animals have become one of the icons that conservationists use to illustrate the threat posed by climate change (The Huffington Post, 2014). You cannot protect a species from the impacts of climate change without addressing the issue of climate change, itself (Defenders of Wildlife, 2013). Large carnivores are extreme indicators of ecosystem health (WWF, n.d.). “As the Arctic sea ice melts, the polar bears lose their primary hunting ground — not to mention their most plentiful and nutritious prey. It remains a question whether they will be able to adapt to changing conditions and survive” (The Huffington Post, 2014). A polar bear at risk is frequently a sign of something wrong somewhere in the arctic marine ecosystem! A polar bear at risk is frequently a sign of something wrong somewhere in the arctic marine ecosystem (WWF, n.d.)!
The Arctic Ocean and the connected frozen seas are home to the largest and most predatory of the bear family. Every bear alive today evolved 22 million years ago from a common ancestor known as the Ursavus of Asia. Polar bears (Ursus maritimus) came from a group of brown bears (Ursus arctos) over 200,000 years ago, which became isolated from the other brown ...
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... phytoplankton to fish, the sea ice is an integral part of the Arctic marine ecosystem” (Derocher, 2014).
Bear Planet. (2012). Polar bears and global warming. http://www.bearplanet.org/polarbear.shtml.
Defenders of Wildlife. (2013). Polar bears and climate change. Retrieved from http://www.defenders.org/polar-bear/climate-change
Works Cited
National wildlife federation—global warming and polar bears—2014--http://www.nwf.org/Wildlife/Threats-to-Wildlife/Global-Warming/Effects-on-Wildlife-and-Habitat/Polar-Bears.aspx
Siegal, K. (2014). One critical reason to cut global warming pollution now: The amazing polar bear. Retrieved from http://www.huffingtonpost.com/kassie-siegel/polar-bears-climate_b_1095121.html
WWF. (N.D.). Threats to polar bears. Retrieved from http://wwf.panda.org/what_we_do/where_we_work/arctic/wildlife/polar_bear/threats/
“Those searching for unmistakable evidence of the global climate crisis should pay a visit to the Arctic. The Arctic is warming twice as fast as the rest of the world. The average annual temperature in Barrow, at the northern-most tip of Alaska, has increased 4.5 degrees Fahrenheit in the last 50 years” (Noblin, n.d.). Polar bears have been threatened in the past by unregulated commercial and sports hunting in the 1960’s and 1970’s. They were being wiped out quickly with modern methods of hunting, including aircraft, and were facing a huge loss in their population. Fortunately the 1973 Agreement on the Conservation of Polar Bears was established which was signed by Canada, Norway, Denmark (for Greenland), the United States of America, and Russia
* The scientific name for polar bear is Ursus maritimus which means sea bear in Latin. They were first identified by Constantine J. Phipps in 1774. Different sources express different theories on the origins of polar bears. Fossil evidence lead researchers to believe that polar bears may have split off from a population of brown bears that became isolated during the Pleistocene epoch. More recent DNA evidence suggests that polar bears became distinct species from brown bears 4-5 million years ago. It has been documented that polar and grizzly bears have produced fertile hybrid offspring. Other names for the polar bear include the Inuit word "nanook", and the Norwegian name of Isbjorn which means "ice bear."
Out of an Ice Age emerged one of our most majestic creatures in the world the polar bear. From its brown bear ancestry, the predator evolved to be a master of a harsh and unwelcoming ice kingdom. Intelligent, adaptable and fierce, the polar bear learned how to survive in a place that offers few comforts to any creature. But now that very environment is in flux. And so is the polar bear’s fate (Nature). Polar Bears are very different from other bears. Polar bears are very large bears compared to Black bears. Polar bears weigh anywhere between 330-1700lbs and Black bears weigh anywhere between 150-600lbs. They have strong legs with large, flattened feet with some webbing between their toes that help with walking on ice and swimming. The wide paws prevent sea ice from breaking by distributing weight while walking. Their paws allow them to pull a 600 pound seal out of its breathing hole (Rosing, 20). The webbed feet results in making polar bears, unlike other bear species to be considered as marine mammals along with seals, sea lions, walruses, whales and dolphins (Polar Bear). According to Rosing Polar bears are excellent swimmers and have been known to swim up to six miles an hour and as far as 60 miles at a stretch. The bears paddle with their front feet and steer with their back feet. They often overheat. Sometimes they venture into the waters just to cool off. When a bear climbs on an ice floe, it shakes itself off because it is trying to prevent ice from forming on its fur (22-23). Because of climate change and hunting of polar bears are now becoming an endangered species which is affecting the food chain. We can fix this by going green, banning polar bear hunting and keep creating these new hybrid bears that are mixed with griz...
The effects of global warming on earth's ecosystems are expected to deepen. The rise in temperature had made the life very difficult for many animal and plant species. Some common warning signs can be seen today. A recent study shows that changes due to global warming compel many animal species to migrate at a higher altitude. Some polar bears in arctic side are drowning because they have to swim longer distances to reach ice floes. In California, shoreline, sea life is moving towards north, as a result of warm water and change in
In recent decades, the global warming threat has captured the attention of the nation and the world. While the main focus began with concentrating on the effects this long-term natural crisis would have on the human population, select groups have worked to approach the topic in a manner that entails prevention in order to help other animal and plant species around the globe. One such organization is the National Oceanic and Atmospheric Administration, which has played a major role in the conservation of the polar bear species, one of the mammals most adversely affected by the recent climate changes. As more research has been conducted regarding the polar bears, scientific name Ursus Maritimus, the conclusions have been shocking. In 2008, the Department to the Interior listed the polar bear species as “threatened” under the Endangered Species Act of 1973 awarding it some protections mandated by the federal government (Wolfe). However, on January 5, 2011, Representative Donald Young proposed a bill in Congress in order to delist the polar bears as threatened, thus decreasing and even removing the conservation efforts that have been set in place over the past three years. The polar bear Species should remain listed under the Endangered Species Act because ice thickness has decreased 40 percent during the past 30 years thus reducing the polar bears’ critical environment, if current conditions continue the polar bear populations around the world may decrease by two thirds by mid century, and since the species has been protected under the Endangered Species Act the worldwide populations have experienced stabilization or growth in most circumstances.
For years, we have heard of the devastating effects of global warming and how the melting of the polar ice caps will cause severe climate changes. One animal that has suffered most from global warming is the polar bear. Global warming has caused the polar bear population to decrease due to the results of having to swim longer distances, loss of habitat, and lack of mates to reproduce offspring. Global warming has caused this species to become endangered and has some attention with social media. Global warming has caused much damage to the polar bear population due to the warming of their habitat.
The reduction if sea-ice coverage is likely to effect krill population (Meade, et al., 2015). The reduction in the duration of sea-ice coverage will allow greater opportunity for humans to exploit the Antarctic ecosystem. Extended periods of ice-free water allow the temporal and spatial expansion of krill fisheries. This leads to increased krill catch, which means a reduction in the number of krill for leopard seals (Meade, et al.,
As the following report demonstrates, some species are adapting to climate changes while many others are not. In some cases, laboratory experiments have lead to the conclusion that certain species can or cannot adapt and evolve. This research is not sufficient to make definitive statements regarding what will happen to species if temperatures and sea levels continue to rise.
In 2008 the Polar bear was put on the endangered species list, they were the first to be placed on this list primarily due to global warming. Many will argue with this fact, but as we will discover through this document, global warming is real and is in fact affecting the lives of the polar bears.
"The Consequences of Global WarmingOn Wildlife." Consequences of Global Warming. N.p., n.d. Web. 21 Feb. 2014. .
According to Shiping Liu and Eline D. Lorenzen (2014), they stated that “it was the longest interglacial in half a million years and lasted almost 50 kyr” (Liu Shiping; Lorenzen D. Eline, 2014). This indicated that the Marine Isotope Stage (MIS) have lasted for really long time and it might have caused the evolutionary relationship of the brown and polar bears to occurred. During this period of time, it had melted many glaciers which had allow the brown bears to colonize to other areas. During the MIS, some brown bears were stress-tolerant and willing to try the new arctic habitat while less tolerant brown bears chose to leave (“Polar Bears and Brown Bears”, n.d.). As times goes on, the brown bears that chose to stay adapted to the arctic habitat and learned to catch seals and fishes and have more fat behind their fur in order to stay warm in the new habitat. Gradually, their fur changed to a snow-white color which was common in the arctic habitat. Some answers still remain unanswered such how long did it take for the polar bears to diverged from brown bears and what could have happened during that time of
The Arctic region is home to a variety of valuable animals and plants, including polar bear, seal, and so on. The ecosystem of the Arctic region is fragile because these animals are evolved to live in extreme conditions. With the climate change, many animals are endangered. Ice is the habitat of polar animals because they have to rely on sea ices for resting, food, and reproduction. With the climate change and the decrease of sea ice, the number of polar animals is decreasing and their health is threatened. For example, the average weight of female polar bears in 1980 was about 650 pounds, but the number reduced to about 500 pounds in 2004 (Djoghlaf 15). The earlier breakup and later condensation of sea ice shortens the hunting season of polar bears. Polar bears mainly feed on seals that indwell icy land. The melting ice reduces the number of seals and food intake of polar bears. In addition, polar bears are used to living in ice caves. The rising temperature causes the collapse of ice caves, which can kill baby bears. The climate change is negatively affecting the biodiversity in the region and will definitely harm the ecosystem
Global warming is one of the most serious problems that people all over the world are dealing with. In fact, however, many people may not realize that global warming also affects animals as badly as it does to human. All Americans should help protect animals from global warming because global warming changes animals’ habitats, decreases food supplies of animals, and even shortens animals’ lifespan.
The polar regions are most affected and vulnerable to the warming temperatures because the poles are covered in ice. The world’s ice sheets are melting faster than ever and temperatures in the Arctic region are rising twice as fast as anywhere else on Earth according to the NRDC. This will have a serious impact on people, wildlife and plants in that region. The National Climate Assessment has said that “By the year 2100, it 's estimated our oceans will be one to four feet higher, threatening coastal systems and low-lying areas, including entire island nations and the world 's largest cities, including New York, Los Angeles, and Miami as well as Mumbai, Sydney, and Rio de Janeiro”. Polar bears are in great threat as the ice sheets melt because they use the ice to travel across the land and hunt. As the sea-ice platforms move further apart, the swimming conditions become more dangerous. The U.S Geological Survey done by the National Wildlife Federation predicts that by the year 2050, two thirds of all polar bears will disappear. Researcher Bill Fraser has tracked the Adelie penguins in Antarctica and reported the numbers have fallen from 32,000 to only 11,000 over the last 30
Overall climate change is going to continue, we might not be able to stop it but we sure can slow it down and if we can slow it down we will be able to keep many amenities that we need and keep most of our ecosystems safe. Animals are a huge part in human society and once we realize we are damaging their environment and by damaging their environment we are risking losing the essentials we need to survive. Humans need to reduce the use of carbon emissions and by doing that will greatly increase the chances of slowing down rapid climate fluctuations.